Small IX IP Blocks

[Mike Hammett <nanog () ics-il net>]

I am starting up a small IX. The thought process was a /24 for every IX location (there will be multiple of them 
geographically disparate), even though we never expected anywhere near that many on a given fabric. Then okay, how do 
we do v6? We got a /48, so the thought was a /64 for each. That one seems more cut and dry. A NANOG BCOP says to subnet 
no smaller than /64, so that makes sense to have one for each location. However, that brings me back to v4. Should I be 
cutting that /24 down into say /25s or /26s? We don't expect to have more than a /27 worth of networks at any one 
location, so a /26 should provide enough risk avoidance in not re-numbering an IX. That said... maybe best practice is 
to just leave it as /24. That's what I've seen at the other small IXes. 

Yes, I looked at NANOG's BCOPs and an article put out by Euro-IX. Didn't see much there. 




----- 
Mike Hammett 
Intelligent Computing Solutions 
http://www.ics-il.com