netdev - Re: FYI: tftp-hpa breaks when used on secondary ip addresses

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Message-Id: <20110304.205817.193701195.davem@davemloft.net>
Date:	Fri, 04 Mar 2011 20:58:17 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	hpa@...or.com
Cc:	ebiederm@...ssion.com, netdev@...r.kernel.org, jsing@...gle.com
Subject: Re: FYI: tftp-hpa breaks when used on secondary ip addresses

From: "H. Peter Anvin" <hpa@...or.com>
Date: Fri, 04 Mar 2011 17:31:00 -0800

> If this is done for all local connections (as opposed to the ones that
> have been configured explicitly by the administrator to behave that
> way), that's a massive lossage.  Not only does a large number of
> applications use this trick to determine if an address is local (e.g.
> allowing bypass) -- it is pretty much the only portable way to do it --
> but it would cause applications which expect to get a reply back from
> the same address they sent a request to to completely fall on their face.

Actually this is what SOL_IP, IP_PKTINFO, was created for.  Even glibc
uses it.
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