Redirect 302 redirect from GET @entry_comment_create (70e6cb)

GET https://kbin.spritesserver.nl/index.php/m/linux@lemmy.ml/t/33295/Where-can-I-ask-questions-about-iproute2-tools

Response
200 OK
IP
216.73.216.88
Profiled on
Token
eb3aa3

Security

Token

There is no security token.

Firewall

main Name
Security enabled
Stateless

Configuration

Key Value
provider security.user.provider.concrete.app_user_provider
context main
entry_point App\Security\KbinAuthenticator
user_checker App\Security\UserChecker
access_denied_handler (none)
access_denied_url (none)
authenticators 
[
  "two_factor"
  "remember_me"
  "App\Security\KbinAuthenticator"
  "App\Security\FacebookAuthenticator"
  "App\Security\GoogleAuthenticator"
  "App\Security\GithubAuthenticator"
  "App\Security\KeycloakAuthenticator"
]

Listeners

Listener Duration Response 
Symfony\Component\Security\Http\Firewall\ChannelListener {#723
  -map: Symfony\Component\Security\Http\AccessMap {#722 …}
  -logger: Monolog\Logger {#783 …}
  -httpPort: 80
  -httpsPort: 443
}
 0.00 ms (none) 
Symfony\Component\Security\Http\Firewall\ContextListener {#706
  -tokenStorage: Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorage {#1017 …}
  -sessionKey: "_security_main"
  -logger: Monolog\Logger {#783 …}
  -userProviders: Symfony\Component\DependencyInjection\Argument\RewindableGenerator {#705 …}
  -dispatcher: Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcher {#747 …}
  -registered: false
  -trustResolver: Scheb\TwoFactorBundle\Security\Authentication\AuthenticationTrustResolver {#780 …}
  -sessionTrackerEnabler: Symfony\Component\Security\Core\Authentication\Token\Storage\UsageTrackingTokenStorage::enableUsageTracking(): void {#703 …}
}
 1.22 ms (none) 
Symfony\Component\Security\Http\Firewall\AuthenticatorManagerListener {#584
  -authenticatorManager: Symfony\Component\Security\Http\Authentication\AuthenticatorManager {#595 …}
}
 0.00 ms (none) 
Scheb\TwoFactorBundle\Security\Http\Firewall\TwoFactorAccessListener {#582
  -twoFactorFirewallConfig: Scheb\TwoFactorBundle\Security\TwoFactor\TwoFactorFirewallConfig {#842 …}
  -tokenStorage: Symfony\Component\Security\Core\Authentication\Token\Storage\UsageTrackingTokenStorage {#1018 …}
  -twoFactorAccessDecider: Scheb\TwoFactorBundle\Security\Authorization\TwoFactorAccessDecider {#581 …}
}
 0.07 ms (none) 
Symfony\Component\Security\Http\Firewall\AccessListener {#579
  -tokenStorage: Symfony\Component\Security\Core\Authentication\Token\Storage\UsageTrackingTokenStorage {#1018 …}
  -accessDecisionManager: Symfony\Component\Security\Core\Authorization\TraceableAccessDecisionManager {#937 …}
  -map: Symfony\Component\Security\Http\AccessMap {#722 …}
}
 0.00 ms (none) 
Symfony\Component\Security\Http\Firewall\LogoutListener {#786
  -tokenStorage: Symfony\Component\Security\Core\Authentication\Token\Storage\UsageTrackingTokenStorage {#1018 …}
  -options: [
    "csrf_parameter" => "_csrf_token"
    "csrf_token_id" => "logout"
    "logout_path" => "app_logout"
  ]
  -httpUtils: Symfony\Component\Security\Http\HttpUtils {#841 …}
  -csrfTokenManager: Symfony\Component\Security\Csrf\CsrfTokenManager {#1015 …}
  -eventDispatcher: Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcher {#747 …}
}
 0.00 ms (none)

Authenticators

No authenticators have been recorded. Check previous profiles on your authentication endpoint.

Access Decision

affirmative Strategy
# Voter class
1 
"Symfony\Component\Security\Core\Authorization\Voter\AuthenticatedVoter"
2 
"Scheb\TwoFactorBundle\Security\Authorization\Voter\TwoFactorInProgressVoter"
3 
"Symfony\Component\Security\Core\Authorization\Voter\RoleHierarchyVoter"
4 
"Symfony\Component\Security\Core\Authorization\Voter\ExpressionVoter"
5 
"App\Security\Voter\EntryCommentVoter"
6 
"App\Security\Voter\EntryVoter"
7 
"App\Security\Voter\MagazineVoter"
8 
"App\Security\Voter\MessageThreadVoter"
9 
"App\Security\Voter\MessageVoter"
10 
"App\Security\Voter\NotificationVoter"
11 
"App\Security\Voter\OAuth2UserConsentVoter"
12 
"App\Security\Voter\PostCommentVoter"
13 
"App\Security\Voter\PostVoter"
14 
"App\Security\Voter\UserVoter"

Access decision log

# Result Attributes Object
1 DENIED ROLE_USER 
null
 
"Scheb\TwoFactorBundle\Security\Authorization\Voter\TwoFactorInProgressVoter"
 ACCESS ABSTAIN 
"Symfony\Component\Security\Core\Authorization\Voter\RoleHierarchyVoter"
 ACCESS DENIED 
"App\Security\Voter\EntryCommentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\EntryVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MagazineVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MessageThreadVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MessageVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\NotificationVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\OAuth2UserConsentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostCommentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\UserVoter"
 ACCESS ABSTAIN
Show voter details
2 DENIED moderate 
App\Entity\Entry {#2412
  +user: Proxies\__CG__\App\Entity\User {#1978 …}
  +magazine: App\Entity\Magazine {#264
    +icon: Proxies\__CG__\App\Entity\Image {#245 …}
    +name: "linux@lemmy.ml"
    +title: "linux"
    +description: """
      From Wikipedia, the free encyclopedia\n
      \n
      Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).\n
      \n
      Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word “Linux” in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.\n
      \n
      ### Rules\n
      \n
      - Posts must be relevant to operating systems running the Linux kernel. GNU/Linux or otherwise.\n
      - No misinformation\n
      - No NSFW content\n
      - No hate speech, bigotry, etc\n
      \n
      ### Related Communities\n
      \n
      - [!opensource@lemmy.ml](https://lemmy.ml/c/opensource)\n
      - [!libre_culture@lemmy.ml](https://lemmy.ml/c/libre_culture)\n
      - [!technology@lemmy.ml](https://lemmy.ml/c/technology)\n
      - [!libre_hardware@lemmy.ml](https://lemmy.ml/c/libre_hardware)\n
      \n
      Community icon by [Alpár-Etele Méder](https://www.iconfinder.com/pocike), licensed under [CC BY 3.0](https://creativecommons.org/licenses/by/3.0/)
      """
    +rules: null
    +subscriptionsCount: 1
    +entryCount: 1406
    +entryCommentCount: 28632
    +postCount: 6
    +postCommentCount: 214
    +isAdult: false
    +customCss: null
    +lastActive: DateTime @1729583542 {#274
      date: 2024-10-22 09:52:22.0 +02:00
    }
    +markedForDeletionAt: null
    +tags: null
    +moderators: Doctrine\ORM\PersistentCollection {#236 …}
    +ownershipRequests: Doctrine\ORM\PersistentCollection {#232 …}
    +moderatorRequests: Doctrine\ORM\PersistentCollection {#221 …}
    +entries: Doctrine\ORM\PersistentCollection {#179 …}
    +posts: Doctrine\ORM\PersistentCollection {#137 …}
    +subscriptions: Doctrine\ORM\PersistentCollection {#199 …}
    +bans: Doctrine\ORM\PersistentCollection {#116 …}
    +reports: Doctrine\ORM\PersistentCollection {#102 …}
    +badges: Doctrine\ORM\PersistentCollection {#80 …}
    +logs: Doctrine\ORM\PersistentCollection {#70 …}
    +awards: Doctrine\ORM\PersistentCollection {#1360 …}
    +categories: Doctrine\ORM\PersistentCollection {#1792 …}
    -id: 73
    +apId: "linux@lemmy.ml"
    +apProfileId: "https://lemmy.ml/c/linux"
    +apPublicUrl: "https://lemmy.ml/c/linux"
    +apFollowersUrl: "https://lemmy.ml/c/linux/followers"
    +apInboxUrl: "https://lemmy.ml/inbox"
    +apDomain: "lemmy.ml"
    +apPreferredUsername: "linux"
    +apDiscoverable: true
    +apManuallyApprovesFollowers: null
    +privateKey: null
    +publicKey: null
    +apFetchedAt: DateTime @1729583596 {#268
      date: 2024-10-22 09:53:16.0 +02:00
    }
    +apDeletedAt: null
    +apTimeoutAt: null
    +visibility: "visible             "
    +createdAt: DateTimeImmutable @1698929468 {#270
      date: 2023-11-02 13:51:08.0 +01:00
    }
  }
  +image: null
  +domain: Proxies\__CG__\App\Entity\Domain {#1889 …}
  +slug: "Where-can-I-ask-questions-about-iproute2-tools"
  +title: "Where can I ask questions about iproute2 tools?"
  +url: null
  +body: """
    I have a very specific questions about Linux Traffic control and u32 filters in particular. However, I don’t know where the right place is to ask such a question as it’s fairly niche.\n
    \n
    The [Linux Advanced Routing & Traffic Control](https://lartc.org/) site says it has a mailing list for questions, but the last post was from 2019. There is also the incredibly busy [‘linux-netdev’ mailing list](https://marc.info/?l=linux-netdev), but, the traffic there looks like strictly source changes.\n
    \n
    Any ideas?\n
    \n
    **The question I’m trying to find an answer to is:** The u32 tc filter seems to support negative byte offsets which allows you to examine the Ethernet frame header (I don’t think I even found documentation on this, this is thanks to ChatGPT). However, when using u32 values to examine 8 bytes I can only use offsets in increments of 4 - like “at -8” or “at -12”, with any other increment giving me the error `Illegal “match”`.\n
    \n
    This seems like only a curiosity, but, I’ve been struggling to get my bit-matching to match the way I expect, and I’m wondering if this suggests that matching doesn’t function the way I think.
    """
  +type: "article"
  +lang: "en"
  +isOc: false
  +hasEmbed: false
  +commentCount: 4
  +favouriteCount: 26
  +score: 0
  +isAdult: false
  +sticky: false
  +lastActive: DateTime @1728989746 {#2418
    date: 2024-10-15 12:55:46.0 +02:00
  }
  +ip: null
  +adaAmount: 0
  +tags: null
  +mentions: null
  +comments: Doctrine\ORM\PersistentCollection {#1688 …}
  +votes: Doctrine\ORM\PersistentCollection {#1966 …}
  +reports: Doctrine\ORM\PersistentCollection {#1965 …}
  +favourites: Doctrine\ORM\PersistentCollection {#1368 …}
  +notifications: Doctrine\ORM\PersistentCollection {#2426 …}
  +badges: Doctrine\ORM\PersistentCollection {#2439 …}
  +children: []
  -id: 33295
  -titleTs: "'ask':4 'iproute2':7 'question':5 'tool':8"
  -bodyTs: "'-12':154 '-8':151 '/)':44 '/?l=linux-netdev),':74 '2019':60 '4':148 '8':138 'advanc':38 'allow':108 'also':63 'answer':94 'ask':27 'bit':180 'bit-match':179 'busi':66 'byte':105,139 'chang':83 'chatgpt':130 'control':10,41 'curios':170 'document':123 'doesn':197 'error':162 'ethernet':113 'even':121 'examin':111,137 'expect':187 'fair':34 'filter':13,100 'find':92 'found':122 'frame':114 'function':199 'get':177 'give':159 'header':115 'howev':16,131 'idea':85 'illeg':163 'incred':65 'increment':146,158 'know':20 'lartc.org':43 'lartc.org/)':42 'last':56 'like':80,149,167 'linux':8,37,68 'linux-netdev':67 'list':51,71 'look':79 'm':89,190 'mail':50,70 'marc.info':73 'marc.info/?l=linux-netdev),':72 'match':164,181,183,196 'negat':104 'netdev':69 'nich':35 'offset':106,144 'particular':15 'place':24 'post':57 'question':6,30,53,87 'right':23 'rout':39 'say':46 'seem':101,166 'site':45 'sourc':82 'specif':5 'strict':81 'struggl':175 'suggest':194 'support':103 'tc':99 'thank':128 'think':119,203 'traffic':9,40,77 'tri':90 'u32':12,98,134 'use':133,143 'valu':135 've':173 'way':185,201 'wonder':191"
  +cross: false
  +upVotes: 0
  +downVotes: 0
  +ranking: 1706380695
  +visibility: "visible             "
  +apId: "https://lemmy.ca/post/14107888"
  +editedAt: null
  +createdAt: DateTimeImmutable @1706296195 {#1858
    date: 2024-01-26 20:09:55.0 +01:00
  }
}
 
"Scheb\TwoFactorBundle\Security\Authorization\Voter\TwoFactorInProgressVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\EntryCommentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\EntryVoter"
 ACCESS DENIED 
"App\Security\Voter\MagazineVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MessageThreadVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MessageVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\NotificationVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\OAuth2UserConsentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostCommentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\UserVoter"
 ACCESS ABSTAIN
Show voter details
3 DENIED edit 
App\Entity\Entry {#2412
  +user: Proxies\__CG__\App\Entity\User {#1978 …}
  +magazine: App\Entity\Magazine {#264
    +icon: Proxies\__CG__\App\Entity\Image {#245 …}
    +name: "linux@lemmy.ml"
    +title: "linux"
    +description: """
      From Wikipedia, the free encyclopedia\n
      \n
      Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).\n
      \n
      Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word “Linux” in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.\n
      \n
      ### Rules\n
      \n
      - Posts must be relevant to operating systems running the Linux kernel. GNU/Linux or otherwise.\n
      - No misinformation\n
      - No NSFW content\n
      - No hate speech, bigotry, etc\n
      \n
      ### Related Communities\n
      \n
      - [!opensource@lemmy.ml](https://lemmy.ml/c/opensource)\n
      - [!libre_culture@lemmy.ml](https://lemmy.ml/c/libre_culture)\n
      - [!technology@lemmy.ml](https://lemmy.ml/c/technology)\n
      - [!libre_hardware@lemmy.ml](https://lemmy.ml/c/libre_hardware)\n
      \n
      Community icon by [Alpár-Etele Méder](https://www.iconfinder.com/pocike), licensed under [CC BY 3.0](https://creativecommons.org/licenses/by/3.0/)
      """
    +rules: null
    +subscriptionsCount: 1
    +entryCount: 1406
    +entryCommentCount: 28632
    +postCount: 6
    +postCommentCount: 214
    +isAdult: false
    +customCss: null
    +lastActive: DateTime @1729583542 {#274
      date: 2024-10-22 09:52:22.0 +02:00
    }
    +markedForDeletionAt: null
    +tags: null
    +moderators: Doctrine\ORM\PersistentCollection {#236 …}
    +ownershipRequests: Doctrine\ORM\PersistentCollection {#232 …}
    +moderatorRequests: Doctrine\ORM\PersistentCollection {#221 …}
    +entries: Doctrine\ORM\PersistentCollection {#179 …}
    +posts: Doctrine\ORM\PersistentCollection {#137 …}
    +subscriptions: Doctrine\ORM\PersistentCollection {#199 …}
    +bans: Doctrine\ORM\PersistentCollection {#116 …}
    +reports: Doctrine\ORM\PersistentCollection {#102 …}
    +badges: Doctrine\ORM\PersistentCollection {#80 …}
    +logs: Doctrine\ORM\PersistentCollection {#70 …}
    +awards: Doctrine\ORM\PersistentCollection {#1360 …}
    +categories: Doctrine\ORM\PersistentCollection {#1792 …}
    -id: 73
    +apId: "linux@lemmy.ml"
    +apProfileId: "https://lemmy.ml/c/linux"
    +apPublicUrl: "https://lemmy.ml/c/linux"
    +apFollowersUrl: "https://lemmy.ml/c/linux/followers"
    +apInboxUrl: "https://lemmy.ml/inbox"
    +apDomain: "lemmy.ml"
    +apPreferredUsername: "linux"
    +apDiscoverable: true
    +apManuallyApprovesFollowers: null
    +privateKey: null
    +publicKey: null
    +apFetchedAt: DateTime @1729583596 {#268
      date: 2024-10-22 09:53:16.0 +02:00
    }
    +apDeletedAt: null
    +apTimeoutAt: null
    +visibility: "visible             "
    +createdAt: DateTimeImmutable @1698929468 {#270
      date: 2023-11-02 13:51:08.0 +01:00
    }
  }
  +image: null
  +domain: Proxies\__CG__\App\Entity\Domain {#1889 …}
  +slug: "Where-can-I-ask-questions-about-iproute2-tools"
  +title: "Where can I ask questions about iproute2 tools?"
  +url: null
  +body: """
    I have a very specific questions about Linux Traffic control and u32 filters in particular. However, I don’t know where the right place is to ask such a question as it’s fairly niche.\n
    \n
    The [Linux Advanced Routing & Traffic Control](https://lartc.org/) site says it has a mailing list for questions, but the last post was from 2019. There is also the incredibly busy [‘linux-netdev’ mailing list](https://marc.info/?l=linux-netdev), but, the traffic there looks like strictly source changes.\n
    \n
    Any ideas?\n
    \n
    **The question I’m trying to find an answer to is:** The u32 tc filter seems to support negative byte offsets which allows you to examine the Ethernet frame header (I don’t think I even found documentation on this, this is thanks to ChatGPT). However, when using u32 values to examine 8 bytes I can only use offsets in increments of 4 - like “at -8” or “at -12”, with any other increment giving me the error `Illegal “match”`.\n
    \n
    This seems like only a curiosity, but, I’ve been struggling to get my bit-matching to match the way I expect, and I’m wondering if this suggests that matching doesn’t function the way I think.
    """
  +type: "article"
  +lang: "en"
  +isOc: false
  +hasEmbed: false
  +commentCount: 4
  +favouriteCount: 26
  +score: 0
  +isAdult: false
  +sticky: false
  +lastActive: DateTime @1728989746 {#2418
    date: 2024-10-15 12:55:46.0 +02:00
  }
  +ip: null
  +adaAmount: 0
  +tags: null
  +mentions: null
  +comments: Doctrine\ORM\PersistentCollection {#1688 …}
  +votes: Doctrine\ORM\PersistentCollection {#1966 …}
  +reports: Doctrine\ORM\PersistentCollection {#1965 …}
  +favourites: Doctrine\ORM\PersistentCollection {#1368 …}
  +notifications: Doctrine\ORM\PersistentCollection {#2426 …}
  +badges: Doctrine\ORM\PersistentCollection {#2439 …}
  +children: []
  -id: 33295
  -titleTs: "'ask':4 'iproute2':7 'question':5 'tool':8"
  -bodyTs: "'-12':154 '-8':151 '/)':44 '/?l=linux-netdev),':74 '2019':60 '4':148 '8':138 'advanc':38 'allow':108 'also':63 'answer':94 'ask':27 'bit':180 'bit-match':179 'busi':66 'byte':105,139 'chang':83 'chatgpt':130 'control':10,41 'curios':170 'document':123 'doesn':197 'error':162 'ethernet':113 'even':121 'examin':111,137 'expect':187 'fair':34 'filter':13,100 'find':92 'found':122 'frame':114 'function':199 'get':177 'give':159 'header':115 'howev':16,131 'idea':85 'illeg':163 'incred':65 'increment':146,158 'know':20 'lartc.org':43 'lartc.org/)':42 'last':56 'like':80,149,167 'linux':8,37,68 'linux-netdev':67 'list':51,71 'look':79 'm':89,190 'mail':50,70 'marc.info':73 'marc.info/?l=linux-netdev),':72 'match':164,181,183,196 'negat':104 'netdev':69 'nich':35 'offset':106,144 'particular':15 'place':24 'post':57 'question':6,30,53,87 'right':23 'rout':39 'say':46 'seem':101,166 'site':45 'sourc':82 'specif':5 'strict':81 'struggl':175 'suggest':194 'support':103 'tc':99 'thank':128 'think':119,203 'traffic':9,40,77 'tri':90 'u32':12,98,134 'use':133,143 'valu':135 've':173 'way':185,201 'wonder':191"
  +cross: false
  +upVotes: 0
  +downVotes: 0
  +ranking: 1706380695
  +visibility: "visible             "
  +apId: "https://lemmy.ca/post/14107888"
  +editedAt: null
  +createdAt: DateTimeImmutable @1706296195 {#1858
    date: 2024-01-26 20:09:55.0 +01:00
  }
}
 
"Scheb\TwoFactorBundle\Security\Authorization\Voter\TwoFactorInProgressVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\EntryCommentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\EntryVoter"
 ACCESS DENIED 
"App\Security\Voter\MagazineVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MessageThreadVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MessageVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\NotificationVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\OAuth2UserConsentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostCommentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\UserVoter"
 ACCESS ABSTAIN
Show voter details
4 DENIED moderate 
App\Entity\Entry {#2412
  +user: Proxies\__CG__\App\Entity\User {#1978 …}
  +magazine: App\Entity\Magazine {#264
    +icon: Proxies\__CG__\App\Entity\Image {#245 …}
    +name: "linux@lemmy.ml"
    +title: "linux"
    +description: """
      From Wikipedia, the free encyclopedia\n
      \n
      Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).\n
      \n
      Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word “Linux” in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.\n
      \n
      ### Rules\n
      \n
      - Posts must be relevant to operating systems running the Linux kernel. GNU/Linux or otherwise.\n
      - No misinformation\n
      - No NSFW content\n
      - No hate speech, bigotry, etc\n
      \n
      ### Related Communities\n
      \n
      - [!opensource@lemmy.ml](https://lemmy.ml/c/opensource)\n
      - [!libre_culture@lemmy.ml](https://lemmy.ml/c/libre_culture)\n
      - [!technology@lemmy.ml](https://lemmy.ml/c/technology)\n
      - [!libre_hardware@lemmy.ml](https://lemmy.ml/c/libre_hardware)\n
      \n
      Community icon by [Alpár-Etele Méder](https://www.iconfinder.com/pocike), licensed under [CC BY 3.0](https://creativecommons.org/licenses/by/3.0/)
      """
    +rules: null
    +subscriptionsCount: 1
    +entryCount: 1406
    +entryCommentCount: 28632
    +postCount: 6
    +postCommentCount: 214
    +isAdult: false
    +customCss: null
    +lastActive: DateTime @1729583542 {#274
      date: 2024-10-22 09:52:22.0 +02:00
    }
    +markedForDeletionAt: null
    +tags: null
    +moderators: Doctrine\ORM\PersistentCollection {#236 …}
    +ownershipRequests: Doctrine\ORM\PersistentCollection {#232 …}
    +moderatorRequests: Doctrine\ORM\PersistentCollection {#221 …}
    +entries: Doctrine\ORM\PersistentCollection {#179 …}
    +posts: Doctrine\ORM\PersistentCollection {#137 …}
    +subscriptions: Doctrine\ORM\PersistentCollection {#199 …}
    +bans: Doctrine\ORM\PersistentCollection {#116 …}
    +reports: Doctrine\ORM\PersistentCollection {#102 …}
    +badges: Doctrine\ORM\PersistentCollection {#80 …}
    +logs: Doctrine\ORM\PersistentCollection {#70 …}
    +awards: Doctrine\ORM\PersistentCollection {#1360 …}
    +categories: Doctrine\ORM\PersistentCollection {#1792 …}
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    IProut 2\n
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    IProut 2\n
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    The french version of fart.
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      I have a very specific questions about Linux Traffic control and u32 filters in particular. However, I don’t know where the right place is to ask such a question as it’s fairly niche.\n
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      The [Linux Advanced Routing & Traffic Control](https://lartc.org/) site says it has a mailing list for questions, but the last post was from 2019. There is also the incredibly busy [‘linux-netdev’ mailing list](https://marc.info/?l=linux-netdev), but, the traffic there looks like strictly source changes.\n
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      """
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    IProut 2\n
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        \n
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      I have a very specific questions about Linux Traffic control and u32 filters in particular. However, I don’t know where the right place is to ask such a question as it’s fairly niche.\n
      \n
      The [Linux Advanced Routing & Traffic Control](https://lartc.org/) site says it has a mailing list for questions, but the last post was from 2019. There is also the incredibly busy [‘linux-netdev’ mailing list](https://marc.info/?l=linux-netdev), but, the traffic there looks like strictly source changes.\n
      \n
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      \n
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      \n
      This seems like only a curiosity, but, I’ve been struggling to get my bit-matching to match the way I expect, and I’m wondering if this suggests that matching doesn’t function the way I think.
      """
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    I don’t have any previous knowledge of this at all, but from reading the docs, nothing you’re describing sounds wrong.\n
    \n
    A u32 selector will match 4 bytes (u32 meaning unsigned 32bit presumably, which is 4 bytes).\n
    \n
    It makes sense that you’d only be able to configure the matches on 4 byte intervals, because keeping them aligned may make the implementation simpler and more efficient. You can still match any set of bits this way.\n
    \n
    Perhaps you could describe what you’re trying to match exactly and the selectors you tried.\n
    \n
    Edit: also if you look at ‘raw payload expressions’ in nft: [netfilter.org/projects/nftables/manpage.html](https://netfilter.org/projects/nftables/manpage.html)\n
    \n
    That seems like it would do what you want, and you can actually access the ethernet header in a documented way. You have to switch to nft though.
    """
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        ### Related Communities\n
        \n
        - [!opensource@lemmy.ml](https://lemmy.ml/c/opensource)\n
        - [!libre_culture@lemmy.ml](https://lemmy.ml/c/libre_culture)\n
        - [!technology@lemmy.ml](https://lemmy.ml/c/technology)\n
        - [!libre_hardware@lemmy.ml](https://lemmy.ml/c/libre_hardware)\n
        \n
        Community icon by [Alpár-Etele Méder](https://www.iconfinder.com/pocike), licensed under [CC BY 3.0](https://creativecommons.org/licenses/by/3.0/)
        """
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      I have a very specific questions about Linux Traffic control and u32 filters in particular. However, I don’t know where the right place is to ask such a question as it’s fairly niche.\n
      \n
      The [Linux Advanced Routing & Traffic Control](https://lartc.org/) site says it has a mailing list for questions, but the last post was from 2019. There is also the incredibly busy [‘linux-netdev’ mailing list](https://marc.info/?l=linux-netdev), but, the traffic there looks like strictly source changes.\n
      \n
      Any ideas?\n
      \n
      **The question I’m trying to find an answer to is:** The u32 tc filter seems to support negative byte offsets which allows you to examine the Ethernet frame header (I don’t think I even found documentation on this, this is thanks to ChatGPT). However, when using u32 values to examine 8 bytes I can only use offsets in increments of 4 - like “at -8” or “at -12”, with any other increment giving me the error `Illegal “match”`.\n
      \n
      This seems like only a curiosity, but, I’ve been struggling to get my bit-matching to match the way I expect, and I’m wondering if this suggests that matching doesn’t function the way I think.
      """
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    I don’t have any previous knowledge of this at all, but from reading the docs, nothing you’re describing sounds wrong.\n
    \n
    A u32 selector will match 4 bytes (u32 meaning unsigned 32bit presumably, which is 4 bytes).\n
    \n
    It makes sense that you’d only be able to configure the matches on 4 byte intervals, because keeping them aligned may make the implementation simpler and more efficient. You can still match any set of bits this way.\n
    \n
    Perhaps you could describe what you’re trying to match exactly and the selectors you tried.\n
    \n
    Edit: also if you look at ‘raw payload expressions’ in nft: [netfilter.org/projects/nftables/manpage.html](https://netfilter.org/projects/nftables/manpage.html)\n
    \n
    That seems like it would do what you want, and you can actually access the ethernet header in a documented way. You have to switch to nft though.
    """
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 ACCESS ABSTAIN 
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 ACCESS ABSTAIN 
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 ACCESS ABSTAIN
Show voter details
12 DENIED moderate 
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        From Wikipedia, the free encyclopedia\n
        \n
        Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).\n
        \n
        Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word “Linux” in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.\n
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        - Posts must be relevant to operating systems running the Linux kernel. GNU/Linux or otherwise.\n
        - No misinformation\n
        - No NSFW content\n
        - No hate speech, bigotry, etc\n
        \n
        ### Related Communities\n
        \n
        - [!opensource@lemmy.ml](https://lemmy.ml/c/opensource)\n
        - [!libre_culture@lemmy.ml](https://lemmy.ml/c/libre_culture)\n
        - [!technology@lemmy.ml](https://lemmy.ml/c/technology)\n
        - [!libre_hardware@lemmy.ml](https://lemmy.ml/c/libre_hardware)\n
        \n
        Community icon by [Alpár-Etele Méder](https://www.iconfinder.com/pocike), licensed under [CC BY 3.0](https://creativecommons.org/licenses/by/3.0/)
        """
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      I have a very specific questions about Linux Traffic control and u32 filters in particular. However, I don’t know where the right place is to ask such a question as it’s fairly niche.\n
      \n
      The [Linux Advanced Routing & Traffic Control](https://lartc.org/) site says it has a mailing list for questions, but the last post was from 2019. There is also the incredibly busy [‘linux-netdev’ mailing list](https://marc.info/?l=linux-netdev), but, the traffic there looks like strictly source changes.\n
      \n
      Any ideas?\n
      \n
      **The question I’m trying to find an answer to is:** The u32 tc filter seems to support negative byte offsets which allows you to examine the Ethernet frame header (I don’t think I even found documentation on this, this is thanks to ChatGPT). However, when using u32 values to examine 8 bytes I can only use offsets in increments of 4 - like “at -8” or “at -12”, with any other increment giving me the error `Illegal “match”`.\n
      \n
      This seems like only a curiosity, but, I’ve been struggling to get my bit-matching to match the way I expect, and I’m wondering if this suggests that matching doesn’t function the way I think.
      """
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  +body: """
    I don’t have any previous knowledge of this at all, but from reading the docs, nothing you’re describing sounds wrong.\n
    \n
    A u32 selector will match 4 bytes (u32 meaning unsigned 32bit presumably, which is 4 bytes).\n
    \n
    It makes sense that you’d only be able to configure the matches on 4 byte intervals, because keeping them aligned may make the implementation simpler and more efficient. You can still match any set of bits this way.\n
    \n
    Perhaps you could describe what you’re trying to match exactly and the selectors you tried.\n
    \n
    Edit: also if you look at ‘raw payload expressions’ in nft: [netfilter.org/projects/nftables/manpage.html](https://netfilter.org/projects/nftables/manpage.html)\n
    \n
    That seems like it would do what you want, and you can actually access the ethernet header in a documented way. You have to switch to nft though.
    """
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}
 
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 ACCESS ABSTAIN
Show voter details
13 DENIED ROLE_USER 
null
 
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 ACCESS ABSTAIN 
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 ACCESS ABSTAIN 
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 ACCESS ABSTAIN 
"App\Security\Voter\PostCommentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostVoter"
 ACCESS ABSTAIN 
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 ACCESS ABSTAIN
Show voter details
14 DENIED moderate 
App\Entity\EntryComment {#4255
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        From Wikipedia, the free encyclopedia\n
        \n
        Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).\n
        \n
        Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word “Linux” in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.\n
        \n
        ### Rules\n
        \n
        - Posts must be relevant to operating systems running the Linux kernel. GNU/Linux or otherwise.\n
        - No misinformation\n
        - No NSFW content\n
        - No hate speech, bigotry, etc\n
        \n
        ### Related Communities\n
        \n
        - [!opensource@lemmy.ml](https://lemmy.ml/c/opensource)\n
        - [!libre_culture@lemmy.ml](https://lemmy.ml/c/libre_culture)\n
        - [!technology@lemmy.ml](https://lemmy.ml/c/technology)\n
        - [!libre_hardware@lemmy.ml](https://lemmy.ml/c/libre_hardware)\n
        \n
        Community icon by [Alpár-Etele Méder](https://www.iconfinder.com/pocike), licensed under [CC BY 3.0](https://creativecommons.org/licenses/by/3.0/)
        """
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    +title: "Where can I ask questions about iproute2 tools?"
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    +body: """
      I have a very specific questions about Linux Traffic control and u32 filters in particular. However, I don’t know where the right place is to ask such a question as it’s fairly niche.\n
      \n
      The [Linux Advanced Routing & Traffic Control](https://lartc.org/) site says it has a mailing list for questions, but the last post was from 2019. There is also the incredibly busy [‘linux-netdev’ mailing list](https://marc.info/?l=linux-netdev), but, the traffic there looks like strictly source changes.\n
      \n
      Any ideas?\n
      \n
      **The question I’m trying to find an answer to is:** The u32 tc filter seems to support negative byte offsets which allows you to examine the Ethernet frame header (I don’t think I even found documentation on this, this is thanks to ChatGPT). However, when using u32 values to examine 8 bytes I can only use offsets in increments of 4 - like “at -8” or “at -12”, with any other increment giving me the error `Illegal “match”`.\n
      \n
      This seems like only a curiosity, but, I’ve been struggling to get my bit-matching to match the way I expect, and I’m wondering if this suggests that matching doesn’t function the way I think.
      """
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      date: 2024-01-26 20:09:55.0 +01:00
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    +magazine: App\Entity\Magazine {#264}
    +image: null
    +parent: null
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    +body: """
      I don’t have any previous knowledge of this at all, but from reading the docs, nothing you’re describing sounds wrong.\n
      \n
      A u32 selector will match 4 bytes (u32 meaning unsigned 32bit presumably, which is 4 bytes).\n
      \n
      It makes sense that you’d only be able to configure the matches on 4 byte intervals, because keeping them aligned may make the implementation simpler and more efficient. You can still match any set of bits this way.\n
      \n
      Perhaps you could describe what you’re trying to match exactly and the selectors you tried.\n
      \n
      Edit: also if you look at ‘raw payload expressions’ in nft: [netfilter.org/projects/nftables/manpage.html](https://netfilter.org/projects/nftables/manpage.html)\n
      \n
      That seems like it would do what you want, and you can actually access the ethernet header in a documented way. You have to switch to nft though.
      """
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      date: 2024-01-26 23:29:29.0 +01:00
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  +root: App\Entity\EntryComment {#4090}
  +body: """
    I really appreciate this, thank you. I think I had confused myself by playing with ‘u16’ and ‘u8’ and somehow coming to the conclusion that they were matching the right side of a 32-bit string. (Which may still be true, but, I’m just masking u32s now).\n
    \n
    This is what I ended up with, which is working the way I’d expect:\n
    \n
    ```\n
    \n
    <span style="color:#323232;">tc filter add dev wlan0 protocol ip parent 1: prio 1 u32 \n
    </span><span style="color:#323232;">\tmatch u32 0x30d6 0x0000ffff at -16 \n
    </span><span style="color:#323232;">\tmatch u32 0xc92d1905 0xffffffff at -12 flowid 1:20\n
    </span>\n
    ```\n
    \n
    This sends Ethernet frames destined for 30:d6:c9:2d:19:05 to flow 1:20, and it doesn’t seem to match a second device I tested. So, all good! Thank you again.
    """
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      +title: "linux"
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        From Wikipedia, the free encyclopedia\n
        \n
        Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).\n
        \n
        Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word “Linux” in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.\n
        \n
        ### Rules\n
        \n
        - Posts must be relevant to operating systems running the Linux kernel. GNU/Linux or otherwise.\n
        - No misinformation\n
        - No NSFW content\n
        - No hate speech, bigotry, etc\n
        \n
        ### Related Communities\n
        \n
        - [!opensource@lemmy.ml](https://lemmy.ml/c/opensource)\n
        - [!libre_culture@lemmy.ml](https://lemmy.ml/c/libre_culture)\n
        - [!technology@lemmy.ml](https://lemmy.ml/c/technology)\n
        - [!libre_hardware@lemmy.ml](https://lemmy.ml/c/libre_hardware)\n
        \n
        Community icon by [Alpár-Etele Méder](https://www.iconfinder.com/pocike), licensed under [CC BY 3.0](https://creativecommons.org/licenses/by/3.0/)
        """
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        date: 2023-11-02 13:51:08.0 +01:00
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    +domain: Proxies\__CG__\App\Entity\Domain {#1889 …}
    +slug: "Where-can-I-ask-questions-about-iproute2-tools"
    +title: "Where can I ask questions about iproute2 tools?"
    +url: null
    +body: """
      I have a very specific questions about Linux Traffic control and u32 filters in particular. However, I don’t know where the right place is to ask such a question as it’s fairly niche.\n
      \n
      The [Linux Advanced Routing &amp; Traffic Control](https://lartc.org/) site says it has a mailing list for questions, but the last post was from 2019. There is also the incredibly busy [‘linux-netdev’ mailing list](https://marc.info/?l=linux-netdev), but, the traffic there looks like strictly source changes.\n
      \n
      Any ideas?\n
      \n
      **The question I’m trying to find an answer to is:** The u32 tc filter seems to support negative byte offsets which allows you to examine the Ethernet frame header (I don’t think I even found documentation on this, this is thanks to ChatGPT). However, when using u32 values to examine 8 bytes I can only use offsets in increments of 4 - like “at -8” or “at -12”, with any other increment giving me the error `Illegal “match”`.\n
      \n
      This seems like only a curiosity, but, I’ve been struggling to get my bit-matching to match the way I expect, and I’m wondering if this suggests that matching doesn’t function the way I think.
      """
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      date: 2024-01-26 20:09:55.0 +01:00
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    +entry: App\Entity\Entry {#2412}
    +magazine: App\Entity\Magazine {#264}
    +image: null
    +parent: null
    +root: null
    +body: """
      I don’t have any previous knowledge of this at all, but from reading the docs, nothing you’re describing sounds wrong.\n
      \n
      A u32 selector will match 4 bytes (u32 meaning unsigned 32bit presumably, which is 4 bytes).\n
      \n
      It makes sense that you’d only be able to configure the matches on 4 byte intervals, because keeping them aligned may make the implementation simpler and more efficient. You can still match any set of bits this way.\n
      \n
      Perhaps you could describe what you’re trying to match exactly and the selectors you tried.\n
      \n
      Edit: also if you look at ‘raw payload expressions’ in nft: [netfilter.org/projects/nftables/manpage.html](https://netfilter.org/projects/nftables/manpage.html)\n
      \n
      That seems like it would do what you want, and you can actually access the ethernet header in a documented way. You have to switch to nft though.
      """
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      "@NotAnArdvark@lemmy.ca"
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      date: 2024-01-26 23:29:29.0 +01:00
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  +root: App\Entity\EntryComment {#4090}
  +body: """
    I really appreciate this, thank you. I think I had confused myself by playing with ‘u16’ and ‘u8’ and somehow coming to the conclusion that they were matching the right side of a 32-bit string. (Which may still be true, but, I’m just masking u32s now).\n
    \n
    This is what I ended up with, which is working the way I’d expect:\n
    \n
    ```\n
    \n
    <span style="color:#323232;">tc filter add dev wlan0 protocol ip parent 1: prio 1 u32 \n
    </span><span style="color:#323232;">\tmatch u32 0x30d6 0x0000ffff at -16 \n
    </span><span style="color:#323232;">\tmatch u32 0xc92d1905 0xffffffff at -12 flowid 1:20\n
    </span>\n
    ```\n
    \n
    This sends Ethernet frames destined for 30:d6:c9:2d:19:05 to flow 1:20, and it doesn’t seem to match a second device I tested. So, all good! Thank you again.
    """
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    date: 2024-01-27 18:45:50.0 +01:00
  }
}
 
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 ACCESS ABSTAIN
Show voter details
16 DENIED moderate 
App\Entity\EntryComment {#4255
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        From Wikipedia, the free encyclopedia\n
        \n
        Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).\n
        \n
        Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word “Linux” in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.\n
        \n
        ### Rules\n
        \n
        - Posts must be relevant to operating systems running the Linux kernel. GNU/Linux or otherwise.\n
        - No misinformation\n
        - No NSFW content\n
        - No hate speech, bigotry, etc\n
        \n
        ### Related Communities\n
        \n
        - [!opensource@lemmy.ml](https://lemmy.ml/c/opensource)\n
        - [!libre_culture@lemmy.ml](https://lemmy.ml/c/libre_culture)\n
        - [!technology@lemmy.ml](https://lemmy.ml/c/technology)\n
        - [!libre_hardware@lemmy.ml](https://lemmy.ml/c/libre_hardware)\n
        \n
        Community icon by [Alpár-Etele Méder](https://www.iconfinder.com/pocike), licensed under [CC BY 3.0](https://creativecommons.org/licenses/by/3.0/)
        """
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        date: 2023-11-02 13:51:08.0 +01:00
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    +domain: Proxies\__CG__\App\Entity\Domain {#1889 …}
    +slug: "Where-can-I-ask-questions-about-iproute2-tools"
    +title: "Where can I ask questions about iproute2 tools?"
    +url: null
    +body: """
      I have a very specific questions about Linux Traffic control and u32 filters in particular. However, I don’t know where the right place is to ask such a question as it’s fairly niche.\n
      \n
      The [Linux Advanced Routing &amp; Traffic Control](https://lartc.org/) site says it has a mailing list for questions, but the last post was from 2019. There is also the incredibly busy [‘linux-netdev’ mailing list](https://marc.info/?l=linux-netdev), but, the traffic there looks like strictly source changes.\n
      \n
      Any ideas?\n
      \n
      **The question I’m trying to find an answer to is:** The u32 tc filter seems to support negative byte offsets which allows you to examine the Ethernet frame header (I don’t think I even found documentation on this, this is thanks to ChatGPT). However, when using u32 values to examine 8 bytes I can only use offsets in increments of 4 - like “at -8” or “at -12”, with any other increment giving me the error `Illegal “match”`.\n
      \n
      This seems like only a curiosity, but, I’ve been struggling to get my bit-matching to match the way I expect, and I’m wondering if this suggests that matching doesn’t function the way I think.
      """
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    +createdAt: DateTimeImmutable @1706296195 {#1858
      date: 2024-01-26 20:09:55.0 +01:00
    }
  }
  +magazine: App\Entity\Magazine {#264}
  +image: null
  +parent: App\Entity\EntryComment {#4090
    +user: App\Entity\User {#4073 …}
    +entry: App\Entity\Entry {#2412}
    +magazine: App\Entity\Magazine {#264}
    +image: null
    +parent: null
    +root: null
    +body: """
      I don’t have any previous knowledge of this at all, but from reading the docs, nothing you’re describing sounds wrong.\n
      \n
      A u32 selector will match 4 bytes (u32 meaning unsigned 32bit presumably, which is 4 bytes).\n
      \n
      It makes sense that you’d only be able to configure the matches on 4 byte intervals, because keeping them aligned may make the implementation simpler and more efficient. You can still match any set of bits this way.\n
      \n
      Perhaps you could describe what you’re trying to match exactly and the selectors you tried.\n
      \n
      Edit: also if you look at ‘raw payload expressions’ in nft: [netfilter.org/projects/nftables/manpage.html](https://netfilter.org/projects/nftables/manpage.html)\n
      \n
      That seems like it would do what you want, and you can actually access the ethernet header in a documented way. You have to switch to nft though.
      """
    +lang: "en"
    +isAdult: false
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    +score: 0
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      date: 2024-10-15 12:55:45.0 +02:00
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      "@NotAnArdvark@lemmy.ca"
      "@NotAnArdvark@lemmy.ca"
    ]
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    -id: 343263
    -bodyTs: "'/projects/nftables/manpage.html](https://netfilter.org/projects/nftables/manpage.html)':107 '32bit':33 '4':28,37,53 'abl':47 'access':121 'actual':120 'align':59 'also':95 'bit':75 'byte':29,38,54 'configur':49 'could':80 'd':44 'describ':20,81 'doc':16 'document':127 'edit':94 'effici':67 'ethernet':123 'exact':88 'express':102 'header':124 'implement':63 'interv':55 'keep':57 'knowledg':7 'like':110 'look':98 'make':40,61 'match':27,51,71,87 'may':60 'mean':31 'netfilter.org':106 'netfilter.org/projects/nftables/manpage.html](https://netfilter.org/projects/nftables/manpage.html)':105 'nft':104,134 'noth':17 'payload':101 'perhap':78 'presum':34 'previous':6 'raw':100 're':19,84 'read':14 'seem':109 'selector':25,91 'sens':41 'set':73 'simpler':64 'sound':21 'still':70 'switch':132 'though':135 'tri':85,93 'u32':24,30 'unsign':32 'want':116 'way':77,128 'would':112 'wrong':22"
    +ranking: 0
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    +editedAt: DateTimeImmutable @1728856127 {#4096
      date: 2024-10-13 23:48:47.0 +02:00
    }
    +createdAt: DateTimeImmutable @1706308169 {#4094
      date: 2024-01-26 23:29:29.0 +01:00
    }
  }
  +root: App\Entity\EntryComment {#4090}
  +body: """
    I really appreciate this, thank you. I think I had confused myself by playing with ‘u16’ and ‘u8’ and somehow coming to the conclusion that they were matching the right side of a 32-bit string. (Which may still be true, but, I’m just masking u32s now).\n
    \n
    This is what I ended up with, which is working the way I’d expect:\n
    \n
    ```\n
    \n
    <span style="color:#323232;">tc filter add dev wlan0 protocol ip parent 1: prio 1 u32 \n
    </span><span style="color:#323232;">\tmatch u32 0x30d6 0x0000ffff at -16 \n
    </span><span style="color:#323232;">\tmatch u32 0xc92d1905 0xffffffff at -12 flowid 1:20\n
    </span>\n
    ```\n
    \n
    This sends Ethernet frames destined for 30:d6:c9:2d:19:05 to flow 1:20, and it doesn’t seem to match a second device I tested. So, all good! Thank you again.
    """
  +lang: "en"
  +isAdult: false
  +favouriteCount: 1
  +score: 0
  +lastActive: DateTime @1706377550 {#4256
    date: 2024-01-27 18:45:50.0 +01:00
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    "323232"
  ]
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    "@NotAnArdvark@lemmy.ca"
    "@Corngood@lemmy.ml"
  ]
  +children: Doctrine\ORM\PersistentCollection {#4252 …}
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  +createdAt: DateTimeImmutable @1706377550 {#4259
    date: 2024-01-27 18:45:50.0 +01:00
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}
 
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 ACCESS DENIED 
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 ACCESS ABSTAIN 
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"App\Security\Voter\UserVoter"
 ACCESS ABSTAIN
Show voter details
17 DENIED ROLE_USER 
null
 
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 ACCESS ABSTAIN 
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Show voter details
18 DENIED moderate 
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      +title: "linux"
      +description: """
        From Wikipedia, the free encyclopedia\n
        \n
        Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).\n
        \n
        Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word “Linux” in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.\n
        \n
        ### Rules\n
        \n
        - Posts must be relevant to operating systems running the Linux kernel. GNU/Linux or otherwise.\n
        - No misinformation\n
        - No NSFW content\n
        - No hate speech, bigotry, etc\n
        \n
        ### Related Communities\n
        \n
        - [!opensource@lemmy.ml](https://lemmy.ml/c/opensource)\n
        - [!libre_culture@lemmy.ml](https://lemmy.ml/c/libre_culture)\n
        - [!technology@lemmy.ml](https://lemmy.ml/c/technology)\n
        - [!libre_hardware@lemmy.ml](https://lemmy.ml/c/libre_hardware)\n
        \n
        Community icon by [Alpár-Etele Méder](https://www.iconfinder.com/pocike), licensed under [CC BY 3.0](https://creativecommons.org/licenses/by/3.0/)
        """
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        date: 2023-11-02 13:51:08.0 +01:00
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    +image: null
    +domain: Proxies\__CG__\App\Entity\Domain {#1889 …}
    +slug: "Where-can-I-ask-questions-about-iproute2-tools"
    +title: "Where can I ask questions about iproute2 tools?"
    +url: null
    +body: """
      I have a very specific questions about Linux Traffic control and u32 filters in particular. However, I don’t know where the right place is to ask such a question as it’s fairly niche.\n
      \n
      The [Linux Advanced Routing &amp; Traffic Control](https://lartc.org/) site says it has a mailing list for questions, but the last post was from 2019. There is also the incredibly busy [‘linux-netdev’ mailing list](https://marc.info/?l=linux-netdev), but, the traffic there looks like strictly source changes.\n
      \n
      Any ideas?\n
      \n
      **The question I’m trying to find an answer to is:** The u32 tc filter seems to support negative byte offsets which allows you to examine the Ethernet frame header (I don’t think I even found documentation on this, this is thanks to ChatGPT). However, when using u32 values to examine 8 bytes I can only use offsets in increments of 4 - like “at -8” or “at -12”, with any other increment giving me the error `Illegal “match”`.\n
      \n
      This seems like only a curiosity, but, I’ve been struggling to get my bit-matching to match the way I expect, and I’m wondering if this suggests that matching doesn’t function the way I think.
      """
    +type: "article"
    +lang: "en"
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    I don’t think posting to the linux-netdev mailing list is a terrible idea. For example, here’s someone who did post a question: [marc.info/?l=linux-netdev&amp;m=170628444014400&amp;w=2](https://marc.info/?l=linux-netdev&m=170628444014400&w=2)\n
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    I don’t think posting to the linux-netdev mailing list is a terrible idea. For example, here’s someone who did post a question: [marc.info/?l=linux-netdev&amp;m=170628444014400&amp;w=2](https://marc.info/?l=linux-netdev&m=170628444014400&w=2)\n
    \n
    But well, you might also be running into a bug or something that could potentially be exploited, or maybe just into a lack of documentation (which is also a bug). Either way, some devs might be interested in knowing about this.
    """
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21 DENIED edit 
App\Entity\Magazine {#264
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    From Wikipedia, the free encyclopedia\n
    \n
    Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).\n
    \n
    Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word “Linux” in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.\n
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    - No misinformation\n
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    ### Related Communities\n
    \n
    - [!opensource@lemmy.ml](https://lemmy.ml/c/opensource)\n
    - [!libre_culture@lemmy.ml](https://lemmy.ml/c/libre_culture)\n
    - [!technology@lemmy.ml](https://lemmy.ml/c/technology)\n
    - [!libre_hardware@lemmy.ml](https://lemmy.ml/c/libre_hardware)\n
    \n
    Community icon by [Alpár-Etele Méder](https://www.iconfinder.com/pocike), licensed under [CC BY 3.0](https://creativecommons.org/licenses/by/3.0/)
    """
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