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 ...

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Packet capture is one of the most fundamental and powerful ways to do network analysis. You can learn virtually anything about what is going on within a network by intercepting and examining the raw ...

I started logging all the packets that my OpenBSD firewall box blocks.<BR><BR>So to monitor it I'm using the command:<pre class="ip-ubbcode-code-pre">tcpdump -l -vvv ...