bad tcp cksum on outgoing packets

From: Chris Stenton <jacs_at_gnome.co.uk>
Date: Thu, 12 Aug 2004 12:50:58 +0100
I have just been doing some debugging on my 5.2.1 box and noticed that
outgoing tcp packets on the box are coming up with bad checksums on
tcpdump. I am using the nge interface.

Here is a sample output.

12:44:29.458021 0:4:e2:10:60:83 0:c:6e:4e:a0:cc ip 82:
hawk.gnome.co.uk.ssh > kite.gnome.co.uk.2167: P [bad tcp cksum 9420!]
2071:2099(28) ack 753 win 65535 (DF) [tos 0x10]  (ttl 64, id 35623, len
68, bad cksum 0!)

12:44:29.642088 0:c:6e:4e:a0:cc 0:4:e2:10:60:83 ip 60:
kite.gnome.co.uk.2167 > hawk.gnome.co.uk.ssh: . [tcp sum ok] 753:753(0)
ack 2099 win 64956 (DF) (ttl 128, id 44852, len 40)


Any ideas whats going on as the packet does not seem to be resent?


Chris
Received on Thu Aug 12 2004 - 10:02:16 UTC

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