[121601] in North American Network Operators' Group
Re: Using /31 for router links
daemon@ATHENA.MIT.EDU (Chris Costa)
Fri Jan 22 20:00:54 2010
In-Reply-To: <4B5A4885.6030901@rollernet.us>
From: Chris Costa <ccosta@cenic.org>
Date: Fri, 22 Jan 2010 17:00:22 -0800
To: Seth Mattinen <sethm@rollernet.us>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
We recently did a backbone router upgrade and the vendor surprisingly
didn't support /31's. We had to renumber all those interconnects and
peering sessions to /30's. That wasn't fun!
On Jan 22, 2010, at 4:53 PM, Seth Mattinen wrote:
> Joe Provo wrote:
>> On Fri, Jan 22, 2010 at 04:08:28PM -0800, 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.
>> rfc3021 is over 9 years old, so should be no suprise that it works
>> well. :-)
>
>
> I'm never surprised anymore by something that should work turning
> out to have some obscure quirk about it, so I figured it was worth
> asking. ;)
>
> ~Seth
>
