We're not releasing v4 yet. But there have been some interesting developments: https://github.com/FreeRADIUS/freeradius-server/commit/dc870475c1b63c5873481... "support DTLS in rlm_radius" v4 now supports outbound RadSec, for both TLS and DTLS. We're working on inbound RadSec too. That will support both TLS and DTLS. Alan DeKok.