[address-policy-wg] PI for Not-DNS Anycast.

On Thu, 14 Jun 2007, Gert Doering wrote:

> But that's not "anycast"... - in my book, anycast is "the same prefix is 
> announced in multiple locations" (which does help against DoS), not "the 
> prefix isn't visible world wide"...?

I never said it was "anycast". I called it "limitcast".

DALnet announces the same prefix in several places in an identical fashion 
as the one I described. So no, it's not anycast as it's not globally 
reachable.

So they have a lot of servers located at the same IP adress in different 
geographical locations, and depending on which one is closest to you, 
you'll reach it. There is no guarantee that you'll reach one of the 
anycasted ones though, as the prefix is not globally reachable.

As far as I know there is no name for this, but personally I refer to it 
as "limitcast".

-- 
Mikael Abrahamsson    email: swmike at swm.pp.se