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Document that 'bad cksum 0' is expected on NICs with checksum off-loading.

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This commit is contained in:
David E. O'Brien 2006-06-20 05:04:05 +00:00
parent 866488d704
commit 35a6917047
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=159785
1 changed files with 7 additions and 0 deletions
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contrib/tcpdump/tcpdump.1
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@ -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;