packet capture and if_bridge ignore bpf rules

Michael Scheidell michael.scheidell at
Tue Dec 21 23:39:56 UTC 2010

On 12/11/10 11:05 AM, Michael Scheidell wrote:
> I am just not working on tracking this down, and sometimes like to use 
> tcpdump/tshark to watch specific packets on a host to look for 
> 'interesting' things.
> I think I have seen this since 6.x  I don't remember it on 5.x, but 
> 5.x used 'bridge' and 6.x and 7.x are using if_bridge.
> system is 7.3, amd64.  tried this on 6.x amd64, and i386. same results.
> googled a lot and didn't see anything I could use.
im an idiot.  its vlan trunked traffic, for tagged vlan packets.

on the systems that don't look like they work:

(tshark|tcpdump) -niem0 vlan and net

works just fine.

Michael Scheidell, CTO
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