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Date: Tue, 16 May 2006 17:40:30 -0700
From: Doug Barton <dougb@FreeBSD.org>
Organization: http://www.FreeBSD.org/
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To: Unix-Solutions - Steven <steven@unix-solutions.be>
References: <001301c67946$604b7f70$aa00000a@cloe>
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Cc: freebsd-net@freebsd.org
Subject: Re: /31 on 2 interfaces
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Unix-Solutions - Steven wrote:
> Hello,
>
> I have 2 servers with both 2x 'em' interfaces in it.
> I configged a /31 on both interfaces
> em0 in box 1 = 10.0.0.1
> em0 in box 2 = 10.0.0.2
That's not a /31, it's the middle two addresses of a /30 (as the end of your
message correctly surmised). Here is a hint. Because they use binary math,
CIDR blocks always start with an even address, and end with an odd one.
hth,
Doug
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