netdev - Re: IP forwarding on a linux IPSec gateway

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Date:	Tue, 31 Jan 2012 17:47:31 +0000
From:	Andrew Beverley <andy@...ybev.com>
To:	"Prashant Batra (prbatra)" <prbatra@...co.com>
Cc:	netdev@...r.kernel.org
Subject: Re: IP forwarding on a linux IPSec gateway

On Fri, 2012-01-27 at 15:31 +0530, Prashant Batra (prbatra) wrote:
> So, it's clear that linux gateway is able to protect the data and send
> to the connected gateway (ESP packets to outer IPs). And the second
> gateway is responding with ESP packet which is decoded on linux gateway
> and sent to the ip stack again by linux kernel (ICMP reply). But the
> reply doesn't reach the host on left subnet.

Didn't somebody else have a similar problem recently? He found that it
worked using one internet provider but not another. If you're not seeing
anything received in tcpdump in the left subnet, then I would suspect
that the packet is getting lost in the WAN somewhere. What happens when
you ping in the other direction?

Andy


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