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IPv6 over IPv4 Softwire with L2TPv3: Case 2 – Router behind CPE as Softwire Initiator LNS CPE /64 prefix /48 prefix DNS, etc RA DHCPv6 PD /64 Interface ID assignment or uniqueness check via new L2TPv3 AVPs /64 prefixes RA DNS, etc DHCP IPv4 ISP to Dual AF Router PD and Auto-Config Dual AF Router to Hosts Auto-Config Dual AF Router IPv6 Payload L2TPv3 o UDP o IPv4 |