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 16:54:59 -0400 (EDT)
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From: Juliusz Chroboczek <jch@pps.jussieu.fr>
Date: Thu, 02 May 2013 22:42:59 +0200

>> >> Do you already have a default route on eth0 when you run this?
> 
>> > Yes, one that is not source-specific.
> 
>> Doesn't matter, you can't have multiple routes with the same lookup
>> keys.
> 
> Perhaps I'm confused, then.  Isn't the lookup key the pair (dst, src)?
> Or do I not understand the semantics of RTA_SRC?

You're specifying on that command line the source address to use on
outgoing frames generated by the host.