Think you know what's happening on your network? Pull out tcpdump and you might be surprised how much it can tell you. In some ways, the tcpdump command may seem like a pretty basic tool for grabbing ...

As a system administrator, small command-line utilities that require little setup and can be used for troubleshooting increase in value--especially when you are called out at 2:00am for a system ...

Part I of this article discussed tcpdump, a command-line utility that sniffs network traffic. Now let's see what it can do. Scenario 1: Established Telnet Connection Using tcpdump we can analyze the ...