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TCPDump Command Helper

Generate tcpdump packet capture commands through an intuitive interface, no need to review tcpdump commands every time you capture packets.

Configuration

Network Interface

AnySpecific

Layer 4 Protocol

TCPUDP

Host Filtering

Port Filtering

Output Options

Console outputSave to file

Generated Command

TCPDump Parameters Reference

Interface Parameters

-i interface

Listen on the specified network interface.

tcpdump -i en0

tcpdump -i any

Protocol Filters

tcp / udp

Filter packets by protocol type.

tcpdump tcp

tcpdump udp

Host Filters

host / src host / dst host

Filter packets by host address (source, destination, or either).

tcpdump host 192.168.1.1

tcpdump src host 10.0.0.1

tcpdump dst host google.com

Port Filters

port / src port / dst port

Filter packets by port number (source, destination, or either).

tcpdump port 80

tcpdump src port 443

tcpdump dst port 22

Output Options

-w filename

Write captured packets to a file instead of displaying them.

tcpdump -w capture.pcap

tcpdump -w ~/network.pcap

Common Examples

Practical Use Cases

Capture HTTP traffic:

tcpdump -i en0 tcp port 80

Monitor DNS queries:

tcpdump -i any udp port 53

Capture SSH connections:

tcpdump -i en0 tcp port 22

Always ensure you have proper permissions before capturing network traffic. TCPDump typically requires root privileges or appropriate network permissions.