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List:       ipfilter
Subject:    block return-icmp(port-unr) returns wrong checksum
From:       Christian Gall <cg () cgall ! de>
Date:       2004-12-10 11:30:35
Message-ID: AA3714399B36ED0DBD6D1185 () [10 ! 0 ! 0 ! 5]
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Hello,

`block return-icmp(port-unr)' returns:

11:21:52.517062 212.8.197.50.64789 > 212.8.201.50.25: S [tcp sum ok] 
3993968112:3993968112(0) win 32768
	<mss 1460,nop,wscale 0,nop,nop,timestamp 0 0> (DF) (ttl 62, id 62806, len 60)
11:21:52.517138 212.8.201.50 > 212.8.197.50: icmp: 212.8.201.50 tcp port 25 
unreachable (wrong icmp csum)
	for 212.8.197.50 > 212.8.201.50: tcp (frag 62806:15340@512)
	(ttl 62, len 15360, bad cksum 10ef (->ffff14ec)!) (DF)
	(ttl 64, id 23552, len 64, bad cksum 0 (->ffffb958)!)

ipf -V
ipf: IP Filter: v4.1.3 (396)
Kernel: IP Filter: v4.1.3
Running: yes
Log Flags: 0 = none set
Default: pass all, Logging: available
Active list: 0
Feature mask: 0x10a

uname -msr
NetBSD 2.0 i386





Christian

--
We're sysadmins. To us, data is a protocol-overhead.

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