Date: Tue, 20 Dec 2011 08:45:52 GMT From: Eugen Konkov <kes-kes@yandex.ru> To: freebsd-gnats-submit@FreeBSD.org Subject: misc/163470: bad cksum in tcpdump output Message-ID: <201112200845.pBK8jq8T051632@red.freebsd.org> Resent-Message-ID: <201112200850.pBK8o5e4048259@freefall.freebsd.org>
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>Number: 163470
>Category: misc
>Synopsis: bad cksum in tcpdump 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:
>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:
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