Simple Port Forwarding Alternatives

socat is a relay for bidirectional data transfer between two independent data channels.

Free open source tool to perform TCP based session relay

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Do you need to map a specific TCP or UDP port on your machine to another port on another machine?

Portfwd, Port Forwarding Daemon, stands for port forwarding daemon.

TheCodingMonkeys, authors of software like SubEthaEdit.

Packet Sender can send and receive UDP, TCP, and SSL on the ports of your choosing.

Netcat is a featured networking utility which reads and writes data across network connections...

Open Source

pwncat - netcat on steroids with Firewall, IDS/IPS evasion, bind and reverse shell, self-injecting shell and port forwarding magic - and its fully scriptable with Python (PSE)

tcpdump is a common packet analyzer that runs under the command line.

Open Source

SmartSniff is a packet sniffer that capture TCP/IP packets and display them as sequence of conversations between clients and servers.

Ettercap is a suite for man in the middle attacks on LAN.

Intercepter-NG is a multifunctional network toolkit for various types of IT specialists.

Router Port Forwarding is a very powerful port forwarding and port triggering software for router.