A simple UNSAFE tool to encrypt / hide your UDP packets. Trying to trick The Great Firewall deep learning VPN detection model. The packet can be easily decrypted if attacker checks the source code.

This tool is usually used with OpenVPN, to avoid being deep-learned by the GFW. OpenVPN already encrypted the packets, so I needn't do it again.

DO NOT USE MASTER BRANCH. It's still under debugging. (the connection migration is not stable)

mkdir build && cd build
cmake .. && make
./udp_forwarder_ng [args ...]

If you run OpenVPN and udp_forwarder on the same PC, you won't access the Internet successfully. If you did it, please think again and you'll realize how stupid you are.

Note: the connection setup procedure maybe a little slow, but it doesn't matter.

• Latency

with proxy: (encrypted OpenVPN + encrypted&obfs udp_forwarder_ng) 70.386ms

without proxy: 0.475ms + 68.578ms = 69.053ms

overhead (OpenVPN+Forwarder): 1.333ms

Every UDP Forwarder, will drop the first client2server packet. (Doesn't matter).

Every UDP Forwarder, will drop

I assume that every connection has a unique port. search for comment tag 1632