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From: Doug Ambrisko <ambrisko@ambrisko.com>
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To: PeterJeremy@optushome.com.au
Date: Tue, 4 Oct 2005 12:09:45 -0700 (PDT)
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Cc: freebsd-arch@freebsd.org
Subject: Re: Bridges
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On Sun, Sep 25, 2005 at 05:22:38AM +1000, Peter Jeremy wrote:
> On Sat, 2005-Sep-24 15:25:06 +0200, Max Laier wrote:
> >for some time now, we have three bridge implementations in the tree:
> > - net/bridge.c         - the "old" bridge
> > - net/if_bridge.c      - the "new" bridge from Net/OpenBSD
> > - netgraph/ng_bridge.c - the netgraph version [1]
> >
> >The new code has several advantages over the old version:
> > - Spanning Tree Protocol (802.1D)
> > - better firewall support (IPv6, stateful filtering, ...)
> > - easy ifconfig(8) configuration
> 
> Since I've recently needed it, neither bridge.c nor if_bridge.c allow
> you to bridge VLAN trunks (you can bridge individual VLANs but that
> becomes unwieldly when you have dozens of VLANs).  I have code to do
> this in bridge.c.

I think I ran into the related problem.  The vlan device calls
IFQ_HANDOFF directly versus the "normal" output bits so you can't
use netgraph etc.  I broke up ether_output so that I could
call the stuff that ether_output does so it would go through
netgraph hooks if configured.

Doug A.