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From: "Manfred Spraul" <manfred@colorfullife.com>
To: "\"Kevin P. Fleming\"" <kevin@labsysgrp.com>
Cc: <linux-kernel@vger.kernel.org>
Subject: Re: How to debug very strange packet delivery problem?
Date: Sat, 5 Jan 2002 00:17:27 +0100
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> - watched the packets leave from the source machine with tcpdump on
> the outbound interface, and the packets arrive intact at the problem
> machine with tcpdump on the ppp interface

Have you dumped the complete packet on both ends, and checked that it
arrives really unchanged? (except the IP checksum and the ttl).
IIRC the option should be -x -s 1500

Perhaps some traffic shaper/firewall corrupts incomming SYN packets?

--
    Manfred

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