[Bug 1570122] Re: ipv6 prefix delegated subnets are not accessable external of the router they are attached.

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

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

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https://bugs.launchpad.net/bugs/1570122

Title:
  ipv6 prefix delegated subnets are not accessable external of the
  router they are attached.

Status in Ubuntu Cloud Archive:
  New
Status in neutron:
  Fix Released
Status in neutron package in Ubuntu:
  Confirmed

Bug description:
  currently ip6tables in the qrouter namespace has the following rule.
  This causes unmarked packets to drop.

  -A neutron-l3-agent-scope -o qr-ca9ffa4f-fd -m mark ! --mark
  0x4010000/0xffff0000 -j DROP

  It seems that prefix delegated subnets don't get that mark set on
  incoming trafic from the gateway port, I had to add my own rule to do
  that.

  ip6tables -t mangle -A neutron-l3-agent-scope -i qg-ac290c4b-4f -j
  MARK --set-xmark 0x4010000/0xffff0000

  At the moment that is probably too permissive, it should likely be
  limited based on the prefix delegated. with a '-d dead:beef:cafe::/64'
  or whatever the delegation is (tested this and it does work).

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