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ngrep

Filter network traffic packets using regular expressions.

More information.

• Capture traffic of all interfaces:

ngrep -d any

• Capture traffic of a specific interface:

ngrep -d {eth0}

• Capture traffic crossing port 22 of interface eth0:

ngrep -d {eth0} port {22}

• Capture traffic from or to a host:

ngrep host {www.example.com}

• Filter keyword 'User-Agent:' of interface eth0:

ngrep -d {eth0} '{User-Agent:}'

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