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IPv6 over IPv4 Softwire with L2TPv3: Case 3 – Host as Softwire Initiator LNS CPE /64 prefix DNS, etc RA DHCPv4/v6 /64 Interface ID assignment or uniqueness check via new L2TPv3 AVPs IPv4 ISP to Dual AF Host Auto-Config Dual AF Host IPv6 Payload L2TPv3 o UDP o IPv4 |