Capsa is an easy to use Ethernet packet sniffer (network analyzer or network sniffer) for network monitoring and troubleshooting purposes. It performs real-time packet capturing, 24/7 network monitoring, advanced protocol analyzing, in-depth packet decoding, and automatic expert diagnosing. By giving you insights into all of your networks operations, Capsa makes it easy to isolate and solve network problems, identify network bottleneck and bandwidth use, and detect network vulnerabilities.
Network administrators can directly monitor http requests, email messages, DNS queries, as well as real-time activities and message details for the four most popular instant messengers: MSN, AIM, ICQ, and Yahoo Messenger.
Capsa is designed to be used by both IT experts and novice users. Problems are clearly identified, and solutions are suggested in understandable terms. The software includes tables and graphs, as well as intuitive statistics and reports. Capsa has the tools that you would not find in other protocol analyzers, including tools to create and replay packets, and ping and scan IPs and MACs across the LAN.
What separates Capsa from other network sniffers is its unique capability to conduct quick drilldown analysis on a single workstation, protocol or packet. After locating a single item, it allows you to get comprehensive and dedicated information about that item.
Whether youre a network administrator who needs to identify, diagnose, and solve network problems quickly, an IT professional who wants to monitor user activities on the network, a security manager who needs to ensure that the corporations communications assets are safe, or a consultant who has to quickly solve network problems for clients, Capsa has the tools that you need.

The license of this software is Free Trial Software, the price is $549, you can free download and get a free trial.