very simple P2P VPN(Virtual Network yes, Private maybe),
this program is intended to help you play LAN games over internet and as proof of concept
when all clients are behind Full-cone NAT, does not work with clients behind Symmetric NAT
at least for now

Warning

Piercing NAT may fail based on network configuration

how to run

install rustc and cargo or rustup, you will need 2024 edition
build using

# to build
cargo build --release
# to run server(registrar)
./target/release/server
# to run client
sudo ./target/release/client -r SERVER_IP -n NETWORK_ID -P PASSWORD # password is optional