From 705134c2402fe70dfea7875710ead4d92b971ec2 Mon Sep 17 00:00:00 2001 From: obrien Date: Tue, 20 Jun 2006 05:04:05 +0000 Subject: Document that 'bad cksum 0' is expected on NICs with checksum off-loading. --- contrib/tcpdump/tcpdump.1 | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'contrib/tcpdump') diff --git a/contrib/tcpdump/tcpdump.1 b/contrib/tcpdump/tcpdump.1 index 5a009ac..3d5bdbd 100644 --- a/contrib/tcpdump/tcpdump.1 +++ b/contrib/tcpdump/tcpdump.1 @@ -2257,6 +2257,13 @@ patches@tcpdump.org NIT doesn't let you watch your own outbound traffic, BPF will. We recommend that you use the latter. .LP +When running +.BR tcpdump +with the +.B \-v +option on a network interface supporting checksum off-loading, +IP packets sourced from this machine will have many false 'bad cksum 0' errors. +.LP On Linux systems with 2.0[.x] kernels: .IP packets on the loopback device will be seen twice; -- cgit v1.1