NetBSD Problem Report #51881
From www@NetBSD.org Sun Jan 15 11:17:35 2017
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Date: Sun, 15 Jan 2017 11:17:34 +0000 (UTC)
From: amonk@backwatcher.com
Reply-To: amonk@backwatcher.com
To: gnats-bugs@NetBSD.org
Subject: tcpdump fails on bridge interface
X-Send-Pr-Version: www-1.0
>Number: 51881
>Category: bin
>Synopsis: tcpdump fails on bridge interface
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: bin-bug-people
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Sun Jan 15 11:20:00 +0000 2017
>Originator: Kyle Amon
>Release: 7.0.2
>Organization:
BackWatcher, Inc.
>Environment:
NetBSD nbsd.backwatcher.com 7.0.2 NetBSD 7.0.2 (XEN3_DOM0.201610210724Z) amd64
>Description:
The tcpdump tool fails to function on a bridge interface, at least
under Xen with a NetBSD 7.0.2 dom0.
As you can see, the bridge exists...
root@nbsd ~ # ifconfig bridge0
bridge0: flags=41<UP,RUNNING> mtu 1500
As you can see the bridge has members...
root@nbsd ~ # brconfig -a
bridge0: flags=41<UP,RUNNING>
Configuration:
priority 32768 hellotime 2 fwddelay 15 maxage 20
ipfilter disabled flags 0x0
Interfaces:
tap2 flags=3<LEARNING,DISCOVER>
port 8 priority 128
xvif1i0 flags=3<LEARNING,DISCOVER>
port 9 priority 128
wm0 flags=3<LEARNING,DISCOVER>
port 1 priority 128
Address cache (max cache: 100, timeout: 1200):
04:73:35:f1:d5:7d wm0 982 flags=0<>
04:8d:0a:ac:38:2e wm0 979 flags=0<>
aa:00:00:d1:00:09 xvif1i0 972 flags=0<>
00:22:83:0e:07:c0 wm0 941 flags=0<>
04:34:a5:e2:f6:6a wm0 682 flags=0<>
04:ad:49:7d:a4:9a wm0 563 flags=0<>
04:d6:62:ba:01:c1 wm0 215 flags=0<>
04:83:9a:11:4d:c8 wm0 -163 flags=0<>
Everything with respect bridging itself is working, but tcpdump
does not work with the bridge interface, as you can see...
root@nbsd ~ # tcpdump -n -i bridge0 icmp
tcpdump: bridge0: No such device exists
(BIOCSETIF failed: Device not configured)
>How-To-Repeat:
Try to use tcpdump on a bridge interface in dom0.
>Fix:
Unknown.
(Contact us)
$NetBSD: query-full-pr,v 1.39 2013/11/01 18:47:49 spz Exp $
$NetBSD: gnats_config.sh,v 1.8 2006/05/07 09:23:38 tsutsui Exp $
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