block return-icmp(port-unr) returns wrong checksum

--==========078531770A4E22094579==========
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline

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]=20
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=20
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 =3D 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.

--==========078531770A4E22094579==========
Content-Type: application/pgp-signature
Content-Transfer-Encoding: 7bit

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.6 (NetBSD)

iD8DBQFBuYjck+wsK9orHkkRAkoPAJ94Clt5BGYVvmGNze7NLt ntFHOX1QCeNjWa
ImifWmiN7fm1BD+OrDjLsCA=
=SLGi
-----END PGP SIGNATURE-----

--==========078531770A4E22094579==========--