>Interesting.  
>
>Regardless, that doesn't change my point.  If you assign /31 to the
>WAN, nothing will work because no matter what you put in for the
>default gateway, FreeBSD will refuse to add it as its default because
>it's not within the subnet of any interface.  So you end up with a
>firewall that can't route to the internet.
>
If I didn't know any better - I'd think you're talking about an MS 
Product ;)