← Back to team overview

kernel-packages team mailing list archive

[Bug 1597806] Re: ipv6 neighbor discovery broken (on a bridge)


apport-collect is not really an option on the machine, nor should any of
that really provide any additional information that's not already in the
bug report.  holler at me if I missed anything relevant.

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

You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.

  ipv6 neighbor discovery broken (on a bridge)

Status in linux package in Ubuntu:

Bug description:
  I have a xenial (4.4.0-24-generic) machine that loses ipv6
  connectivity every time I reboot the gateway it uses.

  br0 is a bridge which has eth0.2 as its only member, with (currently) 6 "scope global temporary deprecated dynamic" (privacy) addresses, and:
      inet6 2601:282:8100:3500:24c:40ff:fe1a:c570/64 scope global mngtmpaddr dynamic
         valid_lft 300sec preferred_lft 120sec

  The tcpdump trace on against eth0.2 of the broken machine:
  http://paste.ubuntu.com/18170606/ (fe80::1 is the gateway)

  http://paste.ubuntu.com/18173670/ is the output of lspci -vvn on one
  of the (quad) interfaces on the machine.

  Setting the bridge to promisc and turning it back off works around the
  issue.  Tcpdump on the underlying eth0.2 does not.

  On another (yakkety) box, running 4-4-0.14-generic, I also see the
  problem: that interface is also br0, with eth0 (untagged) as its only

  All of the above leads me to believe that the kernel is not managing
  to correctly set up (at least some?) of the multicast addresses it
  needs to listen to on the bridge.

To manage notifications about this bug go to: