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Satisfying Softwires Requirements with L2TP
There are 2 versions of L2TP:
L2TPv2 (RFC 2661)
L2TPv3 (RFC 3931)

Both versions can satisfy the Softwires requirements with some changes
For L2TPv2 the changes are very small
For L2TPv3 the changes are larger but provide extra function

PPT Version