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L2TP as Softwire Standard L2TPv2 meets IPv6 over IPv4 softwires requirements today L2TPv2 is currently used in multiple IPv6 over IPv4 solutions L2TPv2 RFC2661 is 99% ready for the IPv4 over IPv6 solution L2TPv3 is a superset of L2TPv2, with enhancements in security, scalability and flexibility for future extensions L2TPv3 is not far from meeting all softwires requirements L2TPv3 RFC3991 automatic fallback to L2TPv2 allows seamless transition from L2TPv2 to L2TPv3 |