Hi, Michael, We're implementing RFC8899 (PLPMTUD) on Linux SCTP recently, and to make this be controlled by setsockopt with SCTP_PEER_ADDR_PARAMS, as in https://datatracker.ietf.org/doc/html/rfc6458#section-8.1.12: we need another two flags to add for spp_flags: SPP_PLPMTUD_ENABLE SPP_PLPMTUD_DISABLE Do you think it makes sense? if yes, does the RFC6458 need to update? if not, do you have a better suggestion for it? Thanks.