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 From:  Chris Buechler <cbuechler at gmail dot com>
 To:  m0n0wall dash dev at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall-dev] /31 CIDR mask
 Date:  Wed, 19 Jan 2005 16:52:34 -0500
On Wed, 19 Jan 2005 13:17:12 -0800, sylikc <sylikc at gmail dot com> wrote:
> 
> > > >/31 should really be removed from the selection drop downs, since it's
> > > >not a valid CIDR mask (well, 0 usable IP's in a /31 so it's pointless
> > > >to have).
> 
> There's some RFC out there that does define using /31 for Point2Point links.
> http://www.faqs.org/rfcs/rfc3021.html
> 

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.
 
-Chris