Dear @fakemanhk, It will be nice to replace the old draft link https://datatracker.ietf.org/doc/html/draft-ietf-softwire-map-03 by the RFC7597: Mapping of Address and Port with Encapsulation (MAP-E): - https://datatracker.ietf.org/doc/html/rfc7597 Note: I am not sure if it is needed to add the page.