Simple two-way UDP and TCP packet relay.

boxy.py -i <input port> -a <remote address> -p <remote port> [-t]

• -i <input port>: Input port the relay listens on (and relays back from)
• -a <remote address>: Remote IP address the relay will send incoming data to
• -p <remote port>: Remote port the relay will send incoming data to
• -t: Relay TCP (otherwise relay UDP if flag is not set)

Relaying UDP data to remote server B at 192.0.2.1:1234, with the relay running at 192.0.2.0:4321

1. Start the relay: python boxy.py -i 4321 -a 192.0.2.1 -p 1234

2. Connect to the relay at 192.0.2.0:4321

3. Done! You can send data to the relay and it will be relayed to the remote server, and you will receive the data returned from the remote server back from the relay itself

Relaying TCP data to remote server B at 192.0.2.1:1234, with the relay running at 192.0.2.0:4321

Same as the UDP example above, but to start the relay, add the -t flag:
python boxy.py -i 4321 -a 192.0.2.1 -p 1234 -t
Any new TCP connections to the relay will be automatically relayed to the remote server.