On Mar 9, 2012, at 12:11 AM, Elmar K. Bins wrote:
3. IPv6! - Is /32 is standard? We have only one /32 allocation from ARIN and thus if using /32 seems like hard deal - we have to likely get another /32 just for anycasting? or we can use /48 without issues? Also, is /48 a good number for breaking /32 so that we can do /48 announcements from different datacenters in simple uni casting setup?
A /48 is quite reasonable. Announcing a whole /32 just for your anycast service would be wasteful.
Why? It's simply another prefix, no matter how big. It might look wasteful, but if *that* is the allocation you *have*, it's the one you ought to use.
One should be careful - people do filter on allocation lengths, so breaking out a /48 out of a /32 allocation and advertising it on its own can lead to it being filtered.
if you know anyone who is filtering /48 , you can start telling them to STOP doing so as a good citizen of internet6. I agree with Woody anything more than /48 for anycast is waste. mehmet