netdev - Re: [PATCH] Allow receiving packets on the fallback tunnel if they pass sanity checks

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Message-Id: <20120628.180958.61012438467797240.davem@davemloft.net>
Date:	Thu, 28 Jun 2012 18:09:58 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	phil@...m.com
Cc:	netdev@...r.kernel.org, phild@...com
Subject: Re: [PATCH] Allow receiving packets on the fallback tunnel if they
 pass sanity checks

From: Phil Dibowitz <phil@...m.com>
Date: Mon, 25 Jun 2012 20:37:35 -0700

> Sure. Sorry, I just kept Ville's patch description.
> 
> We do Layer-3 DSR via IP-in-IP tunneling. Our load balancers wrap an extra IP
> header on incoming packets so they can be routed to the backend. In the v4
> tunnel driver, when these packets fall on the default tunl0 device, the
> behavior is to decapsulate them and drop them back on the stack. So our setup
> is that tunl0 has the VIP and eth0 has (obviously) the backend's real address.
> 
> In IPv6 we do the same thing, but the v6 tunnel driver didn't have this same
> behavior - if you didn't have an explicit tunnel setup, it would drop the packet.
> 
> This patch brings that v4 feature to the v6 driver.
> 
> I think that's the level of detail you're looking for, but I'm happy to expand
> on anything in particular. I also break this down in tons of detail here:

This is a lot better, please resubmit the patch with a proper verbose
commit message, and please submit it properly and without any unrelated
content in the message body as described in Documentation/SubmittingPatches
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