From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: RTA_SRC doesn't work?
Date: Thu, 02 May 2013 15:21:29 -0400 (EDT)
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From: Juliusz Chroboczek <jch@pps.jussieu.fr>
Date: Thu, 02 May 2013 20:31:59 +0200

> 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
>   $

Do you already have a default route on eth0 when you run this?