From owner-freebsd-hackers@FreeBSD.ORG Thu Oct 2 13:37:54 2003 Return-Path: Delivered-To: freebsd-hackers@www.freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id D5CF816A4BF for ; Thu, 2 Oct 2003 13:37:54 -0700 (PDT) Received: from daemon.uop.edu (daemon.uop.edu [138.9.200.11]) by mx1.FreeBSD.org (Postfix) with ESMTP id F387243FDF for ; Thu, 2 Oct 2003 13:37:53 -0700 (PDT) (envelope-from wfroning@pacific.edu) Received: from daemon (localhost [127.0.0.1]) by daemon.uop.edu (8.12.9p1/8.12.9) with SMTP id h92KaZvx017958; Thu, 2 Oct 2003 13:37:51 -0700 (PDT) (envelope-from wfroning@pacific.edu) Date: Thu, 2 Oct 2003 13:36:34 -0700 From: Will Froning To: freebsd-hackers@www.freebsd.org Message-Id: <20031002133634.716f25e2.wfroning@pacific.edu> Organization: OIT, University of the Pacific X-Mailer: Sylpheed version 0.9.3claws (GTK+ 1.2.10; i386-portbld-freebsd4.9) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Subject: 4.6.2-p23 and [tcp bad cksum] X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 02 Oct 2003 20:37:54 -0000 After upgrading my 2 Sendmail servers to 4.6.2-p23 last week I ran into an amazing issue sending mail to hotmail.com and msn.com addresses. I noticed it because of the large queue for those domains building up daily. In the process of troubleshooting I noticed massive [bad tcp cksum] messages in the tcpdump of a hotmail queue run. At first I thought it was a networking problem maybe on our side, maybe theirs. To save disk space I moved it to a 4.9-PRE box and ran the queue for the heck of it. Amazingly all messages went through. I was still experiencing [bad tcp cksum] messages, but at a much lower rate (enough to process all the messages). For the heck of it I upgraded the lower volume box to 4.8 (was on my schedule for this weekend anyhow) and messages started being sent out to hotmail.com and msn.com address. Once that worked I upgraded the other 4.6.2 box and mail is going smoothly. So, this problem didn't happen until -p23 (arp patch). If anyone needs more information please send me a message. If needed I have a partial tcpdump of the working 4.9-PRE box with cksum errors, but at a greatly reduced quantity. Thanks, Will P.S. the lower volume was running patched sendmail that came w/ 4.6.2 (8.12.3p2 I think?). The other is running 8.12.10. -- Will Froning Unix Sys. Admin. (209)946-7470 (209)662-4725 wfroning@pacific.edu