Using /31 for router links

Joe Provo nanog-post at
Sat Jan 23 00:41:24 UTC 2010

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.  :-)

             RSUC / GweepNet / Spunk / FnB / Usenix / SAGE

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