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Date:      Fri, 30 Oct 2009 15:11:27 -0700
From:      Chuck Swiger <cswiger@mac.com>
To:        Sebastian Hyrwall <sh@keff.org>
Cc:        freebsd-net@freebsd.org
Subject:   Re: Hi. /31 on ethernet links
Message-ID:  <18C758A7-1908-4D1A-BDCA-80FF7FD8BC22@mac.com>
In-Reply-To: <4AEB7AE8.5090101@keff.org>
References:  <4AEB7AE8.5090101@keff.org>

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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,
-- 
-Chuck




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