[Cc: freebsd-net] On Thu, Aug 12, 2004 at 12:50:58PM +0100, Chris Stenton wrote: > 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? > You don't have hardware checksums enabled, do you? I barely recall they are incompatible with bpf(4).
Cheers, -- Ruslan Ermilov [EMAIL PROTECTED] FreeBSD committer
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