[121598] in North American Network Operators' Group
Re: Using /31 for router links
daemon@ATHENA.MIT.EDU (Jay Nugent)
Fri Jan 22 19:31:04 2010
Date: Fri, 22 Jan 2010 19:31:30 -0500 (EST)
From: Jay Nugent <jjn@nuge.com>
To: Seth Mattinen <sethm@rollernet.us>
In-Reply-To: <4B5A3DFC.4090305@rollernet.us>
Cc: nanOG list <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Greetings,
On Fri, 22 Jan 2010, Seth Mattinen wrote:
> In the past I've always used /30's for PTP connection subnets out of old
> habit (i.e. Ethernet that won't take unnumbered) but now I'm considering
> switching to /31's in order to stretch my IPv4 space further. Has anyone
> else does this? Good? Bad? Based on the bit of testing I've done this
> shouldn't be a problem since it's only between routers.
Yes, this *IS* done *ALL* the time. P-t-P means that there are ONLY
two devices on the wire - hence point to point. It ONLY uses two IP
addresses (one on each end) and there is no reason or need to ARP on this
wire. So no need for a broadcast or network addresses - it is just the
two end points.
--- Jay Nugent
Nugent Telecommunications
Train how you will Operate, and you will Operate how you were Trained.
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