[address-policy-wg] /24 in Europe, AP and North America?

On 27 Nov 2007, at 11:35, Hank Nussbacher wrote:

> This may have been covered before but I'm not sure.  I have a  
> client that needs a /24 in Europe, a /24 in AP and a /24 in North  
> America - all for multihoming purposes (in each area).  If he  
> becomes a RIPE member, can he get the 3 /24s and 3 ASNs of which  
> only one set will be used in Europe?  Or just get the /19 like  
> everyone else, and carve it into 3 chunks and route them each from  
> a different area?

It's normally a /21, which is enough for eight /24 networks - with a  
caveat.

Some networks, to reduce the effects of deaggregation on their  
routing table size, will filter on the cidr boundaries that RIPE use  
as minimum allocation size.  If you went down the PA route, the  
addresses would come from a range which some people filter to a /21  
smallest subnet size.  If you go down the PI route, you will be  
burning through less IP space and additionally will get your  
addresses from a range that people are less likely to filter /24s in.

Andy