tcpdump Packet Capture / Sniffer / Analyzer

$ tcpdump -i em0 -s 65535 -w packet.pcap
$ xz -z packet.pcap 

TCPDUMP Quick Reference (PDF)

Tcpdump Commands – A Network Sniffer Tool
A tcpdump Tutorial and Primer
How to gather DNS A record requests?
Monitoring DNS Queries with tcpdump
Packet Analyzer: 15 TCPDUMP Command Examples
tcpdump: Capturing with tcpdump for viewing with Wireshark

Manual pages



tcpdump (de)
tcpdump (en)
pcap (de)

Change PCAP files

Bit-Twist: Libpcap-based Ethernet packet generator
Strip off GTP Headers
Bittwiste: pcap Capture File Editor (by Joke Snelders)
Strip radiotap headers from capture files?

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