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Date: Sun, 24 Nov 1996 22:07:58 -0500 (EST)
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Subject: bin/2095: tcpdump improvement/bug
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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: