There is not yet anything close to consensus within the IETF on how IPv6 should be used over ATM. There are at least two (possibly more) proposals on IPv6 over ATM (see draft-ion-* in the Internet Drafts archive near you for documents related to IPv4-IPv6/ATM). So, while it is possible that a prototype implementation exists, there is not yet any sort of interoperable standard for IPv6 over ATM. Best regards, Ran rja@cisco.com --