From: Eric Dumazet <redacted>
Date: Wed, 30 Dec 2015 09:17:42 -0500

On Wed, 2015-12-30 at 15:42 +0300, Stas Sergeev wrote:

quoted

29.12.2015 18:22, Sowmini Varadhan пишет:

quoted

Do you have admin control over the ubuntu router?
If yes, you might want to check the shared_media [#] setting 
on that router for the interfaces with overlapping subnets.
(it is on by default, I would try turning it off).

That didn't help, problem re-appears.
Thanks anyway, looks like I am going to disable accept_redirects then.
It seems buggy and obviously no one cares.

Obviously some people take vacations at this period of the year, and do
stay away from netdev traffic.

+1