Network monitoring with ngrep
Constant monitoring and troubleshooting are key to maintaining a network's availability. With ngrep, you can analyze network traffic in a manner similar to that of other network sniffers. However, unlike its brethern, ngrep can match regular expressions within the network packet payloads. By using its advanced string matching capabilities, ngrep can look for packets on specified ports and assist in tracking the usernames and passwords zipping off the network, as well as all Telnet attempts to the server.
By Mayank Sharma at Linux.com
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