Trav is a simple tool to expose a local port behind full cone nat to public network.
git clone https://github.com/Alozxy/trav cd trav/client go build -o trav
Currently only supports Linux system, and need iptables to create redirect rules.
trav -i 1500 -l 12345 -r 14885 -s stun.mixvoip.com:3478
Then you can find the port exposed on the public network in /tmp/external.port. When someone connect to this port of nat firewall, the traffic will be redirected to port 14885. The file will be updated with next stun request when the nat mapping changes.
For a detailed and complete list of supported arguments, you can use -h flag to view a full version of help.
trav -h Usage of trav: -6 whether to enable ipv6 forwarding. Note that the forwarding port for ipv6 is the external port rather than local port, and will be modified when nat mapping change. -i int interval between two stun request in second (default 120) -l uint local port (default 12345) -r uint redir port (default 14885) -s string stun server address in [addr:port] format, must support stun over tcp. (default "stun.mixvoip.com:3478")