How to capture network packets with tcpdump?

Solution Verified - Updated -

Issue

There are times when troubleshooting of networking issue requires behavioural analysis on the packet level. Success of packet analysis often depends upon acquiring proper packet data in the first place. This document addresses this problem while also providing answers to following questions:

  • How do I capture network packets with tcpdump?
  • How can I monitor Network Traffic on my system?

Environment

  • Red Hat Enterprise Linux (RHEL) versions 3 and newer

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