From owner-freebsd-net Mon Mar 22 14:46:30 1999 Delivered-To: freebsd-net@freebsd.org Received: from orbit.flnet.com (orbit.flnet.com [205.240.232.32]) by hub.freebsd.org (Postfix) with ESMTP id 7E2F71559B; Mon, 22 Mar 1999 14:46:24 -0800 (PST) (envelope-from henrich@orbit.flnet.com) Received: (from henrich@localhost) by orbit.flnet.com (8.8.5/8.8.4) id RAA17593; Mon, 22 Mar 1999 17:46:01 -0500 (EST) Date: Mon, 22 Mar 1999 14:46:01 -0800 From: Charles Henrich To: freebsd-hackers@freebsd.org, freebsd-net@freebsd.org Subject: NAT/SKIP/MTU Message-ID: <19990322144600.A17340@orbit.flnet.com> Mail-Followup-To: freebsd-hackers@freebsd.org, freebsd-net@freebsd.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.95.4i X-Operating-System: FreeBSD 2.2-BETA_A X-PGP-Fingerprint: 1024/F7 FD C7 3A F5 6A 23 BF 76 C4 B8 C9 6E 41 A4 4F Sender: owner-freebsd-net@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org I've run into ap roblem where Im attempting to do both NAT and SKIP on the same machine... However whenever the MTU of the internal (net 10) interface is less than 1500, packets are either dropped or never reassembled properly causing communication with a variety of internet hosts to be broken. SKIP alters the MTU to 1336 (I'm assuming to make space in the packet for the encryption overhead)... When it does this though, everything goes to hell. Has anyone else out there seen this problem and come up with a solution? Is this a FreeBSD networking issue, or is it a problem with NAT, or even worse, is this a problem with other hosts on the network not being able to cope with a different MTU? (I initially noticed this problem with travelocity, and expedia's web sites..) Thanks for any info! -Crh Charles Henrich Manex Visual Effects henrich@flnet.com http://orbit.flnet.com/~henrich To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message