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Date:	Sun, 29 Sep 2013 17:59:36 -0400 (EDT)
From:	David Miller <>
Subject: Re: [ipv4:PATCH] Allow userspace to specify primary or secondary
 ip on interface

From: Vincent Li <>
Date: Tue, 24 Sep 2013 14:09:48 -0700

> the reason for this patch is that we have a multi blade cluster platform 
> sharing 'floating management ip' and also that each blade has its own 
> management ip on the management interface, so whichever blade in the
> cluster becomes primary blade, the 'floating mangaement ip' follows it,
> and we want any of our traffic originated from the primary blade source from
> the 'floating management ip' for consistency. but in this case, since the local
> blade management ip is always the primary ip on the mangaement interface and 
> 'floating management ip' is always secondary, kernel always choose the primary
> ip as source ip address. thus we would like to add the flexibility in kernel to
> allow us to specify which ip to be primary or secondary.

You have the flexibility already.

You can specify a specific source address ot use in routes.
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