Re: buildup of Windows time_wait talking to fbsd 4.10

From: laffer1 (laffer1_at_mail.foolishgames.com)
Date: 01/10/05

  • Next message: Len Conrad: "Re: buildup of Windows time_wait talking to fbsd 4.10" 
    Date: Mon, 10 Jan 2005 10:15:49 -0800 (PST)
To: Len Conrad <LConrad@Go2France.com>

    On Mon, 10 Jan 2005, Len Conrad wrote:

    >
    > We have a windows mailserver that relays its outbound to a fbsd gateway. We
    > changed to a different fbsd gateway running 4.10. Windows then began having
    > trouble sending to 4.10. Windows "netstat -an" shows dozens of lines like
    > this:
    >
    > source IP desitination IP
    > ======================================================================
    > TCP 10.1.16.3:1403 192.168.200.59:25 TIME_WAIT
    > TCP 10.1.16.3:1407 192.168.200.59:25 TIME_WAIT
    > TCP 10.1.16.3:1415 192.168.200.59:25 TIME_WAIT
    > TCP 10.1.16.3:1419 192.168.200.59:25 TIME_WAIT
    > TCP 10.1.16.3:1435 192.168.200.59:25 TIME_WAIT
    > TCP 10.1.16.3:1462 192.168.200.59:25 TIME_WAIT
    > TCP 10.1.16.3:1470 192.168.200.59:25 TIME_WAIT
    > TCP 10.1.16.3:1473 192.168.200.59:25 TIME_WAIT
    > TCP 10.1.16.3:1478 192.168.200.59:25 TIME_WAIT
    > TCP 10.1.16.3:1493 192.168.200.59:25 TIME_WAIT
    > TCP 10.1.16.3:1504 192.168.200.59:25 TIME_WAIT
    > TCP 10.1.16.3:1507 192.168.200.59:25 TIME_WAIT
    > TCP 10.1.16.3:1508 192.168.200.59:25 TIME_WAIT
    > TCP 10.1.16.3:1521 192.168.200.59:25 TIME_WAIT
    > TCP 10.1.16.3:1526 192.168.200.59:25 TIME_WAIT
    > TCP 10.1.16.3:1546 192.168.200.59:25 TIME_WAIT
    > TCP 10.1.16.3:1550 192.168.200.59:25 TIME_WAIT
    > TCP 10.1.16.3:1568 192.168.200.59:25 TIME_WAIT
    > TCP 10.1.16.3:1571 192.168.200.59:25 TIME_WAIT
    > TCP 10.1.16.3:1589 192.168.200.59:25 TIME_WAIT
    > TCP 10.1.16.3:1592 192.168.200.59:25 TIME_WAIT
    > TCP 10.1.16.3:1616 192.168.200.59:25 TIME_WAIT
    > TCP 10.1.16.3:1620 192.168.200.59:25 TIME_WAIT
    > TCP 10.1.16.3:1629 192.168.200.59:25 TIME_WAIT
    > TCP 10.1.16.3:1644 192.168.200.59:25 TIME_WAIT
    > TCP 10.1.16.3:1647 192.168.200.59:25 TIME_WAIT
    > TCP 10.1.16.3:1654 192.168.200.59:25 TIME_WAIT
    >
    > Eventually, the windows SMTP logs line like "cannot connect to remote IP" or
    > "address already in use" because no local tcp/ip sockets are available, we
    > think.
    >
    > The new gateway/fbsd 4.10 "sockstat -4" shows no corresponding tcp
    > connections when the Windows server is showing as above. On the fbsd 4.10
    > machines, smtp logs, syslog, and dmesg show no errors.
    >
    > We switch the windows box to smtp gateway towards the old box/fbsd 4.7, all
    > is cool.
    >
    > Suggestions with how to proceed debugging, please.
    >
    > I'm trying to get the dmesg.boot for the 4.7 and 4.10 boxes now, sorry.
    >
    > Len

    Just off the top of my head...

    You mentioned the freebsd machine is the gateway. Do you have a firewall
    on the host blocking connections from the windows machine? Do you have a
    different kernel configuration between 4.7 and 4.10? i.e. do you have
    something like ipdivert, etc in the kernel on one box and not the other?
    Can the windows machine ping the ip 192.168.200.59 as its a different
    class C?

    Luke
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