4.6.2-p23 and [tcp bad cksum]

From: Will Froning (wfroning_at_pacific.edu)
Date: 10/02/03

  • Next message: Paul Saab: "Re: 4.6.2-p23 and [tcp bad cksum]" 
    Date: Thu, 2 Oct 2003 13:36:34 -0700
To: freebsd-hackers@www.freebsd.org

    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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  • Next message: Paul Saab: "Re: 4.6.2-p23 and [tcp bad cksum]"