$ go install github.com/leejet/nat-probe
$ $GOPATH/bin/nat-probe
Usage of nat-probe:
-b string
bind UDP socket to a specific local address (default "0.0.0.0")
-s string
STUN server address (default "stun.syncthing.net:3478")
-t int
the number of seconds to wait for STUN server's response (default 3)
-v verbose