Teredo and auto-discovery [Re: POLL: Consensus for moving forward with Teredo?]

[Pekka Savola <pekkas@netcore.fi>]

On Sat, 1 May 2004, JORDI PALET MARTINEZ wrote:
> I wonder if Teredo could take advantage of the auto-discovery idea
> (ftp://ftp.rfc-editor.org/in-notes/internet-drafts/draft-palet-v6ops-tun-auto-disc-00.txt),
> making sure that if required both the 6to4, TB/TS/TSP, ISATAP and
> the Teredo relays, can coexist automatically in the same box. This
> could easily simplify the deployment and be an important
> multiplicative factor.
> 
> So, I will suggest a new option "a.bis)": The idea is to make a very
> quick move on defining a solution for the auto-discovery, and
> include this in a revised Teredo version (same with ISATAP, TSP,
> etc.).
> 
[...]
> 
> Christian, Pekka what do you think ? (I've not read the latest
> versions of Teredo, so I'm not sure if what I'm saying is actually
> meaningful, but I understand that the server/relay need to be
> pre-configured, so can we make it auto-discovered ?, indeed we
> didn't included Teredo in our I-D, but may be an option for the next
> revision).

I'm having difficulty figuring out what you mean, yes :).

Relay doesn't need to be configured.  Server must be configured, and
typically would probably have to be unless there would be an anycast
prefix which could be used to find the closest serving server (like
with 6to4 relays).  (Vendors shipping products which use their server
pre-configure this so no user config is needed.)  Anycast discovery
was removed from the spec some time ago, but it it's deemed useful, it
could maybe be added back so that you would only use the anycast
address to discover the relay, and use a unicast address after that
(or something).

With regard to the end-points, you could devise a tunnel server
solution that's usable by Teredo clients out-of-the-box.  If you
hijack a popular Teredo server's IP address, you can even force your
users to use the tunnel server ;-).

-- 
Pekka Savola                 "You each name yourselves king, yet the
Netcore Oy                    kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings