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IPv6 over IPv4 Softwire with L2TPv2: Case 2 – Router behind CPE as Softwire Initiator LNS CPE /64 prefix /48 prefix DNS, etc RA DHCPv6 PD IPv6CP: capable of /64 interface ID assignment or uniqueness check /64 prefixes RA DNS, etc DHCPv4/v6 IPv4 ISP to Dual AF Router PD and Auto-Config Dual AF Router to Hosts Auto-Config Dual AF Router IPv6 o PPP L2TPv2 o UDP o IPv4 |