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Date: Mon, 19 Jun 2000 17:46:58 +0200 (CEST)
From: Udo Erdelhoff <ue@nathan.ruhr.de>
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To: FreeBSD-gnats-submit@freebsd.org
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Subject: bin/19377: tcpdump and tun-Device
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>Number:         19377
>Category:       bin
>Synopsis:       tcpdump -i tun0 not port/host x shows incoming traffic for that host/port
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Jun 19 08:50:01 PDT 2000
>Closed-Date:
>Last-Modified:
>Originator:     Udo Erdelhoff
>Release:        FreeBSD 5.0-CURRENT i386
>Organization:
private User
>Environment:

-current as of 18-JUN-2000 
buildworld/installworld/new kernel
ppp-connections over PPPoE and "conventional" modems with and without nat

>Description:

According to manpage, ``tcpdump not port X'' should not display traffic
from or to that port. Likewise, ``tcpdump not host X'' should not display
traffic from or to that host.

tcpdump works "as advertised" when I'm snooping on a conventional interface 
(tested with bofh ed and fxp). If I'm sniffing on the tun device, tcpdump
will still capture and display the incoming traffic. Using ``tcpdump not
( port X ) '' or ``tcpdump not ( src port X )'' doesn't change anything.

>How-To-Repeat:

use tcpdump not port X on a tun device with traffic for that port

>Fix:


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


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