NatTypeTester RFC supports RFC 3489 RFC 5389 RFC 5769 RFC 5780 RFC 7350 RFC 7443 RFC 7635 RFC 8489 Internet Protocol IPv4 IPv6 Transmission Protocol UDP TCP TLS-over-TCP DTLS-over-UDP Preview STUN Server Docker docker pull hmbsbige/stunserver docker run -d --restart=always --net=host --name=stunserver hmbsbige/stunserver --mode full --primaryinterface $IP1 --altinterface $IP2