UDP Reverse Tunnel - HowTo

udp-reverse-tunnel.md

UDP Reverse Tunnel

How to send UDP packets from a public host to a private host behind NAT, with no port forwarding.

Install UDP reverse tunnel

https://github.com/prof7bit/udp-reverse-tunnel

Multiple UDP ports

0. Install with a parameter instead of a fixed port

sudo make install-outside listen=%i

1. Rename

cd /etc/systemd/system
mv udp-tunnel-outside.service udp-tunnel-outside@.service

2. Edit the udp-tunnel-outside@.service file to work with a parameter

[Unit]
Description=reverse UDP tunnel (outside agent) on port %i
Wants=network-online.target
After=network-online.target

[Service]
Type=simple
Restart=always
RestartSec=60

ExecStart=udp-tunnel -l %i

[Install]
WantedBy=multi-user.target

3. Enable it and start passing the ports as a parameter

sudo systemctl enable udp-tunnel-outside@{5001..5004}
sudo systemctl daemon-reload
sudo systemctl start udp-tunnel-outside@{5001..5004}

4. Check status

systemctl status udp-tunnel-outside@{5001..5004}