Fred Baker fred at cisco.com
Fri Jun 1 23:27:21 UTC 2007

On Jun 1, 2007, at 4:05 PM, Iljitsch van Beijnum wrote:

> Solution: new type of local addresses that doesn't require any  
> router magic to keep the packets within the site, and is globally  
> unique so network merging isn't an issue.

But ULAs *do* require router magic. They require a policy to be in  
place that causes them to not be advertised unless the policy is  
overridden, and a policy that doesn't believe them even if they are  
mistakenly advertised. The simple way to accomplish this is to either  
(small installations) list the prefixes one will advertise or accept,  
or (larger installations) explicitly deny ULAs before permitting  
those in the relevant communities (send side) or accepting anything  

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