diff options
| author | Jason McIntyre <jmc@cvs.openbsd.org> | 2008-04-21 08:17:24 +0000 |
|---|---|---|
| committer | Jason McIntyre <jmc@cvs.openbsd.org> | 2008-04-21 08:17:24 +0000 |
| commit | 4432e4181cdf5c9dd50df0e1014f9d3aea79cfcd (patch) | |
| tree | 195960cc19ecf2d04fcbb471fb59366144f714c3 /usr.sbin | |
| parent | 2b828274cf3d4eb5e3976307960617ec5d5e6b99 (diff) | |
add a short section on checksum offloading, based on a diff
from Alf Schlichting;
help/ok henning
Diffstat (limited to 'usr.sbin')
| -rw-r--r-- | usr.sbin/tcpdump/tcpdump.8 | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/usr.sbin/tcpdump/tcpdump.8 b/usr.sbin/tcpdump/tcpdump.8 index a1a8585ad5a..085cf8ed35a 100644 --- a/usr.sbin/tcpdump/tcpdump.8 +++ b/usr.sbin/tcpdump/tcpdump.8 @@ -1,4 +1,4 @@ -.\" $OpenBSD: tcpdump.8,v 1.66 2008/04/18 21:35:11 djm Exp $ +.\" $OpenBSD: tcpdump.8,v 1.67 2008/04/21 08:17:23 jmc Exp $ .\" .\" Copyright (c) 1987, 1988, 1989, 1990, 1991, 1992, 1994, 1995, 1996 .\" The Regents of the University of California. All rights reserved. @@ -19,7 +19,7 @@ .\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF .\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. .\" -.Dd $Mdocdate: April 18 2008 $ +.Dd $Mdocdate: April 21 2008 $ .Dt TCPDUMP 8 .Os .Sh NAME @@ -1795,6 +1795,12 @@ Ethernet interface removed the packet from the wire and when the kernel serviced the .Dq new packet interrupt. +.Ss IP Checksum Offload +Some network cards support IP checksum offload. +Packet headers for such interfaces erroneously indicate a bad checksum, +since the checksum is not calculated until after +.Nm +sees the packet. .Sh SEE ALSO .\" traffic(1C), nit(4P), .Xr ethers 3 , |