NatTypeTester Channel Status CI Stun.Net 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 RFC3489 RFC5389 Binding Test Checking for UDP Connectivity with the STUN Server Mapping Behavior Determining NAT Mapping Behavior Filtering Behavior Determining NAT Filtering Behavior Combining Tests STUN Server Docker docker pull hmbsbige/stunserver docker run -d --restart=always --net=host --name=stunserver hmbsbige/stunserver --mode full --primaryinterface $IP1 --altinterface $IP2