One can still do DS-lite when the provider only offers NAT64. A B4 can connect to a AFTR which can be anywhere that is reachable via IPv6. I can see small ISPs and those that can't get IPv4 addresses for themselves out sourcing the DS-lite service. -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: marka at isc.org