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tcpdump - tcpdump is a common packet analyzer that runs under the command line.
socat - socat is a relay for bidirectional data transfer between two independent data channels.
SmartSniff - SmartSniff is a packet sniffer that capture TCP/IP packets and display them as sequence of conversations between clients and servers.
Komodia Relay - Free open source tool to perform TCP based session relay
netcat - Netcat is a featured networking utility which reads and writes data across network connections...
Simple Port Forwarding - Simple Port Forwarding works with WebPages and not directly with your router.