Date: Thu, 2 Oct 2003 13:36:34 -0700 From: Will Froning <wfroning@pacific.edu> To: freebsd-hackers@www.freebsd.org Subject: 4.6.2-p23 and [tcp bad cksum] Message-ID: <20031002133634.716f25e2.wfroning@pacific.edu>
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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
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