Introduction - If you have any usage issues, please Google them yourself
STUN (Simple Traversal of UDP over NATs, NAT traversal of UDP simple) is a network protocol that allows in the NAT (or multiple NAT) after the client to identify their public IP address to identify yourself in the type of behind a NAT and NAT for a particular local port is bound to Internet-side port. This information is used in two while in NAT router UDP traffic between hosts. The agreement defined by the RFC 3489.