Ethereal Alternatives

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

Open Source

Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.

Open Source

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

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

Open Source

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

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

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

NetworkMiner is a Network Forensic Analysis Tool (NFAT) for Windows.

Capsa Enterprise, a strong intelligent network traffic analysis & monitoring software, can quickly pinpoint network problems in real time & improve network performance.

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.

Simple Port Forwarding works with WebPages and not directly with your router.

Free open source tool to perform TCP based session relay