a very simple local-tunnel.
usage:
//public server
node ltunnel-s server-port token
//for example on a public server-ip 8.8.8.8
node ltunnel-s 10086 xyz
NOTE: USE 1xxxx port
//NATed machine forward local-port to public
node ltunnel-c server-ip server-port local-port token local-host(default to 127.0.0.1)
//for example forward 22 to public
node ltunnel-c 8.8.8.8 10086 22 xyz
//any machine wants to connect to your NATed machine
use the server-ip:server-port
//for example
ssh -p 10086 some-user@8.8.8.8