Date: Sun, 24 Nov 1996 22:07:58 -0500 (EST) From: anderson@conterra.com To: FreeBSD-gnats-submit@freebsd.org Subject: bin/2095: tcpdump improvement/bug Message-ID: <199611250307.WAA19362@hawaii.conterra.com> Resent-Message-ID: <199611250320.TAA00419@freefall.freebsd.org>
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>Number: 2095
>Category: bin
>Synopsis: tcpdump doesn't display ip-in-ip correctly
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sun Nov 24 19:20:07 PST 1996
>Last-Modified:
>Originator: Stuart Anderson
>Organization:
Conterra Communications
>Release: FreeBSD 2.1-STABLE i386
>Environment:
ISP server debugging MBONE traffic
>Description:
tcpdump doesn't match the ip-in-ip protocol used by MBONE traffic.
in.h defines IPPROTO_ENCAP as 98, while IPPROTO_IPIP (4) is actually
used by mrouted. tcpdump is checking for IPPROTO_ENCAP so it doesn't
match the IPPROTO_IPIP which is used.
>How-To-Repeat:
Just use tcpdump to monitor mbone traffic.
>Fix:
*** print-ip.c.orig Sun Nov 24 21:59:39 1996
--- print-ip.c Sun Nov 24 21:57:18 1996
***************
*** 389,394 ****
--- 389,395 ----
#define IPPROTO_ENCAP 4
#endif
case IPPROTO_ENCAP:
+ case IPPROTO_IPIP:
/* ip-in-ip encapsulation */
if (vflag)
(void)printf("%s > %s: ",
>Audit-Trail:
>Unformatted:
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