In your previous mail you wrote: In other words, does the RFC 2492 play the same role as classic IPover ATM or Lan emulation? => yes, RFC 2492 plays this role but I believe 6TAP routers support only IPv6 over ATM PVCs, *not* IPv6 over ATM SVCs which is far more complex... and not necessary in such a case. Regards Francis.Dupont@inria.fr