IP addresses for the RIPE NCC

as my earlier recommendation attests, i agree with you.  grab a /48 and do
as in v4.  except ...

rfc 2772 - 6Bone Backbone Routing Guidelines

4. Routing Policies for the 6bone

   Leaf sites or pNLAs MUST only advertise to an upstream provider the
   prefixes assigned by that provider. Advertising a prefix assigned by
   another provider to a provider is not acceptable, and breaks the
   aggregation model. A site MUST NOT advertise a prefix from another
   provider to a provider as a way around the multi-homing problem.
   However, in the interest of testing new solutions, one may break this
   policy, so long as ALL affected parties  are aware of this test, and
   all agree to support this testing.  These policy breaks MUST NOT
   affect the 6bone routing table globally.

...

   All 6bone pTLAs MUST NOT advertise prefixes longer than a given pTLA
   delegation (currently /24 or /28) to other 6bone pTLAs unless special
   peering arrangements are implemented. When such special peering
   aggreements are in place between any two or more 6bone pTLAs, care
   MUST be taken not to leak the more specifics to other 6bone pTLAs not
   participating in the peering aggreement. 6bone pTLAs which have such
   agreements in place MUST NOT  advertise other 6bone pTLA more
   specifics to downstream 6bone pNLAs or leaf sites, as this will break
   the best-path routing decision.

cute, eh?  will work well in scalable reality, eh?

randy, struggling along in 2001:418:1::/48