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Date: Tue, 20 Dec 2011 08:45:52 GMT
From: Eugen Konkov <kes-kes@yandex.ru>
To: freebsd-gnats-submit@FreeBSD.org
Subject: bad cksum in tcpdump output
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>Number:         163470
>Category:       bin
>Synopsis:       bad cksum in tcpdump(1) output
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Dec 20 08:50:04 UTC 2011
>Closed-Date:    
>Last-Modified:  Mon Jan 16 01:32:26 UTC 2012
>Originator:     Eugen Konkov
>Release:        9.0-CURRENT (Jun10), 10.0-CURRENT (17 Dec)
>Organization:
ISP FreeLine
>Environment:
FreeBSD meta-up 10.0-CURRENT FreeBSD 10.0-CURRENT #1: Sat Dec 17 21:11:04 EET 2011     adm@meta-up:/usr/obj/usr/src/sys/KES_KERN_v10  i386
on both machines same result
>Description:
tcpdump -n -i vlan492 -vv
10:40:47.679077 IP (tos 0x0, ttl 1, id 60569, offset 0, flags [DF], proto TCP (6), length 40, bad cksum 0 (->8a69)!)
    77.93.52.10.179 > 77.93.52.9.20224: Flags [.], cksum 0x02e8 (incorrect -> 0xc4f9), seq 23, ack 55, win 8759, length 0
10:41:06.339857 IP (tos 0xc0, ttl 1, id 46979, offset 0, flags [DF], proto TCP (6), length 59, bad cksum 0 (->bea8)!)
    77.93.52.14.24404 > 77.93.52.9.179: Flags [P.], cksum 0x02ff (incorrect -> 0x25e0), seq 20:39, ack 219, win 8760, length 19: BGP, length: 19

is it right behaviour?
>How-To-Repeat:

>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted:
