On 4/8/06, Neil A. Hillard <m0n0 at dana dot org dot uk> wrote:
>
> Apologies for following up my own post but I've now tried with a second
> interface in my firewall.  I can now confirm:
>
> 1) With a real interface as OPT1 the problem still exists.
>
> 2) With a real interface as WAN the problem is resolved.
>

From a few Google Groups searches, it looks like you aren't the only
one that's had this problem with late 4.x releases and early 5.x
releases.  I wasn't able to find a definitive solution, but there are
a lot of threads out there.  You might find a solution if you search
"vlan bridging" group:*freebsd*.

-Chris