Re: IPv6 Multi-homing BOF at NANOG 35

[Paul Jakma <paul@clubi.ie>]

On Mon, 10 Oct 2005, Brian E Carpenter wrote:

> The point of shim6 is to *avoid* the need for PI-like space for 
> multihomed sites, so that we don't do to the IPv6 BGP table what 
> multihoming is doing to the IPv4 BGP table. We need IPv6 to scale 
> vastly more than IPv4, so this is essential.

The problem isn't PI addressing, it's advertising tiny prefixes in 
the routing table. PI addressing *without* global-routing-table 
visibility *would* obviously scale for routing. We just don't have a 
way to do this.

> I hope the proposed BOF will make this clearer. I personally think 
> that shim6 will be really cool for ISPs, although as Geoff says it 
> will take a while to deploy and during that time we'll need a 
> PI-like approach.

We'll always need PI. The Independence part of PI is what people 
/really/ want. They don't want multiple-PA (they can do that already 
relatively easily). If people can not get globally-unique PI 
addresses they will use private PI space and use address translation.

>    Brian

regards,
--
Paul Jakma	paul@clubi.ie	paul@jakma.org	Key ID: 64A2FF6A
Fortune:
The herd instinct among economists makes sheep look like independent thinkers.