netdev - RTA_SRC doesn't work?

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Message-ID: <7iy5bx6xnk.wl%jch@pps.univ-paris-diderot.fr>
Date:	Thu, 02 May 2013 20:31:59 +0200
From:	Juliusz Chroboczek <jch@....jussieu.fr>
To:	netdev@...r.kernel.org
Subject: RTA_SRC doesn't work?

Dear all,

We're trying to get RTA_SRC to work, and failing, both in IPv4 and
IPv6.  (We tried with Debian's kernels 3.2 and 3.8).  There are good
reasons why we want to avoid using multiple routing tables, so we'd
really like it to work, at least for v6.

In v4, RTA_SRC appears to be completely ignored:

  $ sudo ip route add default from 172.23.36.54/32 dev eth0
  RTNETLINK answers: File exists
  $

In v6, RTA_SRC appears to be passed to the kernel, but these routes
appear to be unused by the kernel:

  $ sudo ip -6 addr add fd51:92c5:dd08:0::1 dev eth0
  $ sudo ip -6 route add default from fd51:92c5:dd08::/48 dev eth0 via fe80::ea11:32ff:fecf:2dc2
  $ ip -6 route show default
  default from fd51:92c5:dd08::/48 via fe80::ea11:32ff:fecf:2dc2 dev eth0  metric 1024 
  $ telnet 2a00:1450:4007:809::1014
  Trying 2a00:1450:4007:809::1014...
  telnet: Unable to connect to remote host: Network is unreachable

Has anyone been able to make this work?  Any help?

-- Juliusz
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