netdev - Re: [RFC] interface for outgoing packet

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Message-ID: <1315462145.2532.10.camel@edumazet-laptop>
Date:	Thu, 08 Sep 2011 08:09:05 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Viral Mehta <viral.vkm@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [RFC] interface for outgoing packet

Le mercredi 07 septembre 2011 à 20:24 -0400, Viral Mehta a écrit :
> Hi All,
> 
> How reasonably I can assume that,
> 
> on whatever interface, I received the last packet
> for a particular Socket Connection, the same interface will be
> used to SEND the next packet for same socket connection?
> 

No

> I am collecting the logs on one of my test machines.
> And it shows, I can assume all the time that "interface" which received packet
> for some socket connection, the same will be used to send packet for
> that connection
> 
> But, I am not sure if I am missing some scenarios
> or setup (for e.g., bonding) where it can be wrong ?
> 
> It would be more help if some one can shed some light.

By default, a socket is not bound to one interface, so you cant assume
this.

Check SO_BINDTODEVICE socket option if you need it.



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