Public bug reported:
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.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
** Affects: linux-lts-xenial (Ubuntu)
Importance: Undecided
Status: New
** Tags: xenial
** Also affects: linux-lts-xenial (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1738219
Title:
the kernel is blackholing IPv6 packets to linkdown nexthops
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