Best practices for routing 6to4 addresses

[Daniel G. Kluge]

Hello there,
I was wondering if there is some consensus on how to deal with 6to4  
(2002::/16) addresses (and of course this applies to a certain extent  
to Teredo).

There are three ways how to configure this in an IPv6 network, and I  
think I've seen all three:
1. Configure a 6to4 relay on each router (which has to be dual- 
stacked) and use the local interface as a static route.
2. Have only one central 6to4 relay which is advertised internally  
(and maybe further).
3. Pray that you learn 2002::/16 over one of your peers or transit  
providers (and fail - hello AS16215)

What's the way to go? (Apart from not using 6to4 or any other  
automated transition mechanism)

Cheers,
-daniel (Great, www.ipv6tf.org seems to be reachable by IPv4 only)