[address-policy-wg] RIPE Access Policy Change Request to allow allocations to critical infrastructure

Hi,

On Mon, Jan 19, 2004 at 05:45:51PM +0100, Joao Damas wrote:
> This goal could very well be achieved by keeping the addresses of the 
> servers you are already using and migrating all other active IP's out 
> of the /24 that contains the address you want to "anycast". After all, 
> none of the root servers that are anycasting today have renumbered (one 
> that is not anycasting today will renumber soon because they can't 
> apply what I just described, which was unfortunate).

For the root servers, this is a viable approach (as you can't easily
change their IP address).

I'm not sure how useful this approach would be for a typical ccTLD that
hosts their existing name servers in the PA address block of some
hosting provider.

> The problem is then with obtaining a /24 for each anycasted site, not 
> for the service IP but for the "management" IP, something that allows 
> you to uniquely identify the different incarnations of the the same IP, 
> geographically distributed and only accessible through networks other 
> than your own (for the operator of the anycast service, anycast is 
> indeed different from multi-homing).
> Depending on the requirements for independence (in its various 
> aspects), you may use an IP inside someone else's PA block for that, if 
> you buy hosting from them, for instance, or you may need to ask for a 
> separate /24.
> It is this last part that may pose a problem within current RIPE 
> policies.

This specific solution (a separate /24 per anycast *instance*) would
indeed *also* be a problem under the current policy, but this can be 
solved - as you suggested - by going for "local" PA addresses.

The problem is really the anycast space - you need a routeable /24
(as far as anybody can promise "routeability") for a single host, and 
the current PI policy won't give you that.

Gert Doering
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