# portfwd

**Repository Path**: andrewgithub/portfwd

## Basic Information

- **Project Name**: portfwd
- **Description**: User-space TCP/UDP port forwarding services
- **Primary Language**: Unknown
- **License**: MIT
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 1
- **Forks**: 0
- **Created**: 2020-10-08
- **Last Updated**: 2022-05-24

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

portfwd
=======

User-space TCP/UDP port forwarding services

## Summary
 This project contains two applications: tcpfwd, udpfwd, which are for TCP and UDP port forwarding literally.
 Written in pure C, with libevent2 library.
 
## Usage ##

    tcpfwd|udpfwd <local_addr:local_port> <dest_addr:dest_port> [-d] [-o]
     
    Options:
      -d              run in background
      -o              accept IPv6 connections only for IPv6 listener
      -p <pidfile>    write PID to file

## Examples

##### Map local TCP port 1022 to 192.168.1.77:22

    tcpfwd 0.0.0.0:1022 192.168.1.77:22     # allow access from all hosts
    tcpfwd 127.0.0.1:1022 192.168.1.77:22   # only allow localhost
    tcpfwd [::]:1022 192.168.1.77:22        # allow access to port 1022 via both IPv4 and IPv6

##### Map local UDP port 53 to 8.8.8.8:53

    udpfwd 0.0.0.0:53 8.8.8.8:53
    udpfwd [::]:53 8.8.8.8:53

##### IPv4-IPv6 transforming

    udpfwd [::]:1701 localhost:1701         # add IPv6 support for a local L2TP service
    tcpfwd 0.0.0.0:80 [2001:db8:3::2]:80    # enable IPv4 access for an IPv6-only web service