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$ curl repovive.com/roadmaps/network-design/troubleshooting-methodology/tcpdump-usage

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Tcpdump Usage - Troubleshooting Methodology | Network Design | Repovive

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Network Design26 sections · 911 units44h total

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Tcpdump Usage

Command-line capture

Tcpdump runs on command line without a GUI. It is available on nearly every Unix system and is perfect for remote troubleshooting.

Basic usage:

tcpdump -i eth0
tcpdump -i eth0 host 192.168.1.100
tcpdump -i eth0 port 80
tcpdump -i eth0 -w capture.pcap

Useful options:

-n: Do not resolve hostnames
-v: Increase verbosity
-c N: Capture N packets then stop
-w file: Write to file

Capture to file with tcpdump, then analyze with Wireshark for best results.