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[Chuck Short <chuck.short@xxxxxxxxxxxxx>]

** Also affects: neutron/kilo
   Importance: Undecided
       Status: New

** Changed in: neutron/kilo
       Status: New => Fix Committed

** Changed in: neutron/kilo
    Milestone: None => 2015.1.2

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https://bugs.launchpad.net/bugs/1494336

Title:
  Neutron traceback when an external network without IPv6 subnet is
  attached to an HA Router

Status in neutron:
  Fix Released
Status in neutron kilo series:
  Fix Committed

Bug description:
  For an HA Router which does not have any subnets in the external network, Neutron 
  sets the IPv6 proc entry[1] on the gateway interface to receive Router Advts from 
  external IPv6 router and configure a default route pointing to the LLA of the external IPv6 Router.

  Normally for an HA Router in the backup state, Neutron removes Link Local Address (LLA)
  from the gateway interface. 

  In Kernel version 3.10 when the last IPv6 address is removed from the interface, 
  IPv6 is shutdown on the iface and the proc entries corresponding to the iface are deleted (i.e., /proc/sys/net/ipv6/conf/<interface>)
  This issue is resolved in the later kernels [2], but the issue exists on platforms with Kernel version 3.10
  When IPv6 proc entries are missing and Neutron tries to configure the proc entry we see the following traceback [3] in Neutron. 

  [1] /proc/sys/net/ipv6/conf/qg-1fc4061d-3c/accept_ra
  [2] http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=876fd05ddbae03166e7037fca957b55bb3be6594
  [3] Trace:
      Command: ['ip', 'netns', 'exec', 'qrouter-e66b99aa-e840-4a13-9311-6242710a5452', 'sysctl', '-w', 'net.ipv6.conf.qg-1fc4061d-3c.accept_ra=2']
      Exit code: 255
      Stdin:
      Stdout:
      Stderr: sysctl: cannot stat /proc/sys/net/ipv6/conf/qg-1fc4061d-3c/accept_ra: No such file or directory

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