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From: Kevin Day <toasty@dragondata.com>
Date: Wed, 18 Jan 2006 14:31:28 -0600
To: "Dave Raven" <dave@raven.za.net>
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Cc: freebsd-net@FreeBSD.org
Subject: Re: em driver + VLAN's
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On Jan 18, 2006, at 9:05 AM, Dave Raven wrote:

> FreeBSD 4.9 - char em_driver_version[] = "1.7.16";
>
> I've tried multiple bridge configurations - from bridging just  
> em0,em1 to
> bridging two vlan's attached to each card. Unfortunately I don't  
> have access
> to the box at the moment - if its still necessary I will fetch the
> information tomorrow (ifconfig etc)
>
> To sum up its something like the following
> 	net.inet.ether.bridge_config=em0,em1
> 	net.inet.ether.bridge=1
>
> Or vlan0,vlan1 with:
> 	ifconfig vlan0 create
> 	ifconfig vlan1 create
> 	ifconfig vlan0 vlan 100 vlandev em0
> 	ifconfig vlan1 vlan 100 vlandev em1
>
>
> If I change to using fxp it immediately works..
>
> Thanks for the help
> Dave
>


Try adding:

ifconfig em0 promisc
ifconfig em1 promisc


We found it was necessary in a few situations with em devices and  
bridging.