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 From:  sylikc <sylikc at gmail dot com>
 To:  Chris Buechler <cbuechler at gmail dot com>
 Cc:  M0n0wall Dev List <m0n0wall dash dev at lists dot m0n0 dot ch>
 Subject:  Re: [m0n0wall-dev] /31 CIDR mask
 Date:  Wed, 19 Jan 2005 13:17:12 -0800
Chris,

> > >/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

I'm not sure how that applies to m0n0, but I do remember reading
somewhere that some routers will route traffic between hosts on a /31.

> > >
> > >I know it uses a for...next type of thing to go from 1-32 (iirc) but
> > >it really needs to exclude 31.
> > >

> For the firewall rules, it's fine, since that does comprise of two
> IP's.  For the interfaces, it's not going to work if you assign a /31.
>  I should have specified interface screens only.



/sylikc