Re: addition of TLV to locator ID or locator ID set

[Paul Jakma <paul@clubi.ie>]

On Mon, 3 Oct 2005, Erik Nordmark wrote:

> Sure. But that assumes that the hosts know their addresses.

They do. It would be the address they are using.

> As I understood it, a host would configure its IPv6 address as 
> today (stateless, DHCPv6, etc). And the shim proxy would form a HBA 
> parameter set (based on the prefixes assigned to the site) for each 
> host and run a 1:1 NAT. In that case the host doesn't know which 
> IPv6 address the proxy has picked for it.

The proxy wouldn't pick addresses, it would only map prefixes. So the 
end-host inside the shimmed area could use a CGA address (thanks btw 
for helping me to prod my brain into grokking them offline ;) ). Ie:

host uses: <prefix>:<CGA interface identifier>

(a shim6 ULID essentially, even if the host isn't quite aware of 
this).

Proxy: maps <prefix> to <LocatorN> according to established shim6
       protocols.

> Or where you thinking that the host could only use DHCPv6 and the 
> shim proxy and the DHCP server would coordinate things so that the 
> host is informed of its shimmed addresses?

The host might /only/ have a shimmed address.

It might also have other addresses, I don't know. Sadly there isn't a 
good way that I know of to indicate metrics for 
prefix-advertisements.

> You mean you assume it is ok to publish unreachable addresses in 
> the DNS?

Why wouldn't it be exactly? Publishing something in DNS is no 
guarantee of reachability. It would be /intended/ to be reachable, 
via shim6.

The taboo was on non-globally-unique addresses in DNS, i thought?

> Even if folks agree on that, the fact that the internal hosts would 
> see both the local/internal address, and the shimmed addresses, 
> would mean that they might seeming randomly end up using the 
> shimmed addresses, and such internal communication ends up going 
> via the proxy.

Not sure why that'd be so. It's an interior routing issue.

regards,
--
Paul Jakma	paul@clubi.ie	paul@jakma.org	Key ID: 64A2FF6A
Fortune:
Peter's hungry, time to eat lunch.