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draft-defeng-l3vpn-ipv4-ipv6-hybrid-01 Characteristics of Case 2 PE maintains IPv4 routes, IPv6 mapped NAT-PT IPv4 routes and true IPv6 routes; Communication between IPv4 site and IPv6 site needs NAT-PT translation; Communication between two IPv6 sites use true IPv6 routes at PE; Different routes are selected at Ingress PE according to IPv4/IPv6 types of Source/Destination sites when forwarding. |