From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Subject: Re: Q: bad routing table cache entries
Date: Tue, 29 Dec 2015 10:22:08 -0500
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To: Stas Sergeev <stsp@list.ru>
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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).

AFAICT, the code does the right thing per rfc1812 when setting
IPSKB_DOREDIRECT if shared_media is turned off.

--Sowmini

[#] https://www.frozentux.net/ipsysctl-tutorial/chunkyhtml/theconfvariables.html