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Sender: Sebastian Hyrwall <zibbe@cisko.org>
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Date: Sat, 31 Oct 2009 01:22:37 +0100
From: Sebastian Hyrwall <sh@keff.org>
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To: Chuck Swiger <cswiger@mac.com>
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Cc: freebsd-net@freebsd.org
Subject: Re: Hi. /31 on ethernet links
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Chuck Swiger skrev:
> On Oct 30, 2009, at 4:46 PM, Sebastian Hyrwall wrote:
>> Is there any way to use /31's on ordinary ethernet links in 7.2? 
>> "ifconfig addr dest-addr" does not work either. It keeps setting the 
>> last ip as broadcast.
>
> A /31 subnet is only defined for point-to-point network links, per:
>
>   http://www.rfc-editor.org/rfc/rfc3021.txt
>
> Ordinary ethernet links have BROADCAST flag set instead of POINTOPOINT.
>
> Regards,
Well how do I set the POINTOPOINT flag and remove the BROADCAST-flag on 
ethernet links? Or are you implying that it does not belong on ethernet 
links :)
Cause Cisco and Linux support /31 (ptp's) on ordinary ethernet links.

Sincerely,
Sebastian H