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Old 16th May 2008
bram85 bram85 is offline
Real Name: Bram Schoenmakers
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Default IPF: Packets Out Of Window

I'm having problems with receiving some mails on a QMail box. To be more specific, only mails with rather larger attachments (+500K). This appears to be a firewall issue, because when the firewall (IPF) is off, the message is received.

I kept track of the blocked packages and saw the following packet being blocked during such SMTP transfer:

Code:
09/05/2008 12:54:23.973302 xl1 @0:28 b 111.111.11.11,58211 -> 222.222.22.22,25 PR tcp len 20 1500 -AP IN OOW
A packet gets Out Of Window and thus is blocked.

I read that this is a IPF issue, which might be fixed in a later versions (running IPF 4.1.8 (416) now). freebsd-update didn't offer IPF updates and I'm not feeling like I'm going to upgrade that server to a newer FreeBSD (running 6.0 now).

What do you suggest, is there a fix without doing updates?
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Tags
ipf, oow, tcp window scaling

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