udpflow

udpflow is a Go program that forwards UDP datagrams between two sockets. It is primarily useful for establishing a proxy between IPv4 and IPv6.

Installation

This program is written in Go. You can compile and install this program with:

env CGO_ENABLED=0 go install github.com/yoursunny/udpflow@main

Usage

The program accepts four positional arguments:

1. Local endpoint A.
2. Remote endpoint A.
3. Local endpoint B.
4. Remote endpoint B.

Each endpoint is written as IPv4:port or [IPv6]:port. The program listens on the two local endpoints. For each UDP datagram received from a remote endpoint, it is sent to the other remote endpoint.

Sample command:

./udpflow 192.0.2.1:4000 192.0.2.2:4000 [2001:db8:8ce8:70ef::1]:4000 [2001:db8:8ce8:70ef::2]:4000