In your previous mail you wrote: Sorry for the delayed answer, but I had to verify some things. => Argh! This important mail was under tons of other mails (I use a 1GB file-system for mails then they are never lost, just buried :-). I recommend reading: ftp://ftp.ripe.net/internet-drafts/draft-ietf-ngtrans-6bone-multi-00.txt Unfortunately it seems to be expired and I don't know what the status is of it becomming an RFC. The author is Francis Dupont who's involved in this working group. Francis, do you know the status of this document? => it is still alived, in fact today it is implemented and they are new ideas about the source address selection issue... I have to publish an updated version of it but I don't know in which IETF WG. Perhaps we (me, Kazu Yamamoto and others) shall organize a BOF at the next IETF ? Regards Francis.Dupont@inria.fr