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[Bug 1738219] Re: the kernel is blackholing IPv6 packets to linkdown nexthops

 

** Changed in: linux (Ubuntu)
       Status: Confirmed => Triaged

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: linux-lts-xenial (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Xenial)
       Status: New => Confirmed

** Changed in: linux (Ubuntu Xenial)
       Status: Confirmed => Triaged

** Changed in: linux (Ubuntu Xenial)
   Importance: Undecided => Medium

** No longer affects: linux-lts-xenial (Ubuntu)

** Tags added: kernel-da-key

** Also affects: linux (Ubuntu Zesty)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Bionic)
   Importance: Medium
       Status: Triaged

** Also affects: linux (Ubuntu Artful)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Artful)
       Status: New => Triaged

** Changed in: linux (Ubuntu Zesty)
       Status: New => Triaged

** No longer affects: linux-lts-xenial (Ubuntu Xenial)

** Changed in: linux (Ubuntu Artful)
   Importance: Undecided => Medium

** Changed in: linux (Ubuntu Zesty)
   Importance: Undecided => Medium

** Changed in: linux (Ubuntu Xenial)
       Status: Triaged => In Progress

** Changed in: linux (Ubuntu Zesty)
       Status: Triaged => In Progress

** Changed in: linux (Ubuntu Artful)
       Status: Triaged => In Progress

** Changed in: linux (Ubuntu Bionic)
       Status: Triaged => In Progress

** Changed in: linux (Ubuntu Xenial)
     Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

** Changed in: linux (Ubuntu Zesty)
     Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

** Changed in: linux (Ubuntu Artful)
     Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

** Changed in: linux (Ubuntu Bionic)
     Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

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https://bugs.launchpad.net/bugs/1738219

Title:
  the kernel is blackholing IPv6 packets to linkdown nexthops

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Xenial:
  In Progress
Status in linux source package in Zesty:
  In Progress
Status in linux source package in Artful:
  In Progress
Status in linux source package in Bionic:
  In Progress

Bug description:
  When the 'ignore_routes_with_linkdown' sysctl is set, we should not
  consider linkdown nexthops during route lookup.

  While the code correctly verifies that the initially selected route
  ('match') has a carrier, it does not perform the same check in the
  subsequent multipath selection, resulting in a potential packet loss.

  In case the chosen route does not have a carrier and the sysctl is set,
  choose the initially selected route.

  Fixed in the upstream kernel with patch:

  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bbfcd77631573ac4a9f57eb6169e04256a111bc1

  I think this patch must be backported to stable kernel in Xenial. I
  tested in patching the Ubuntu Xenial 4.4.0-21-generic and it works for
  me.

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