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Wireshark - Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.
socat - socat is a relay for bidirectional data transfer between two independent data channels.
tcpdump - tcpdump is a common packet analyzer that runs under the command line.
Komodia Relay - Free open source tool to perform TCP based session relay
SmartSniff - SmartSniff is a packet sniffer that capture TCP/IP packets and display them as sequence of conversations between clients and servers.
Simple Port Forwarding - Simple Port Forwarding works with WebPages and not directly with your router.