From mboxrd@z Thu Jan 1 00:00:00 1970 From: bert hubert Date: Fri, 07 Dec 2001 00:38:55 +0000 Subject: Re: [LARTC] Weird problem, not 100% routing based. Message-Id: List-Id: References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: lartc@vger.kernel.org On Thu, Dec 06, 2001 at 05:54:36PM -0600, Bill Williamson wrote: Bill, please do not silently move discussions away from the mailinglist! I am not a free consulting firm! > > Run 'tcpdump -e -s 1500 -n -i eth0' while you try to connect to yourself > and > > supply us with the IP addresses. Replace eth0 with the right interface. > Sanitized output of the tcpdump you provided: 5.4 a8:d7 1b:94 192.168.0.3.53395 > x.y.z.w.80: S 912730624:912730624(0) win 5840 (DF) 5.4 1b:94 a8:d7 x.y.z.w.53395 > 192.168.0.3.80: S 912730624:912730624(0) win 5840 (DF) This part is good, your .0.3 host tries to connect to the external address, your router immediately sends a reply back, properly NATted. 5.4 a8:d7 1b:94 192.168.0.3.53395 > x.y.z.w.80: . ack 1 win 5840 (DF) Linux doesn't go for it. It basically says 'I know this session already'! This trace is all very very broken, and I think parts of it are missing. I suspect that your router gets confused by timestamp and SACK options, but I'm not sure. Regards, bert -- http://www.PowerDNS.com Versatile DNS Software & Services Trilab The Technology People Netherlabs BV / Rent-a-Nerd.nl - Nerd Available - 'SYN! .. SYN|ACK! .. ACK!' - the mating call of the internet _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://ds9a.nl/2.4Routing/