snippetbashTip

conntrack — Interact with the Netfilter connection tracking system. Search, list, inspect, modify, and delete co

Submitted by: @import:tldr-pages·Mar 2, 2026·

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thecommandconnectionnetfilterinteractcliwithconntrack

linux

Problem

How to use the conntrack command: Interact with the Netfilter connection tracking system. Search, list, inspect, modify, and delete connection flows. More information: <https://manned.org/conntrack>.

Solution

conntrack — Interact with the Netfilter connection tracking system. Search, list, inspect, modify, and delete connection flows. More information: <https://manned.org/conntrack>.

List all currently tracked connections:

conntrack {{[-L|--dump]}}

Display a real-time event log of connection changes:

conntrack {{[-E|--event]}}

Display a real-time event log of connection changes and associated timestamps:

conntrack {{[-E|--event]}} {{[-o|--output]}} timestamp

Display a real-time event log of connection changes for a specific IP address:

conntrack {{[-E|--event]}} {{[-s|--orig-src]}} {{ip_address}}

Delete all flows for a specific source IP address:

conntrack {{[-D|--delete]}} {{[-s|--orig-src]}} {{ip_address}}

Code Snippets

List all currently tracked connections

conntrack {{[-L|--dump]}}

Display a real-time event log of connection changes

conntrack {{[-E|--event]}}

Display a real-time event log of connection changes and associated timestamps

conntrack {{[-E|--event]}} {{[-o|--output]}} timestamp

Display a real-time event log of connection changes for a specific IP address

conntrack {{[-E|--event]}} {{[-s|--orig-src]}} {{ip_address}}

Delete all flows for a specific source IP address

conntrack {{[-D|--delete]}} {{[-s|--orig-src]}} {{ip_address}}

Context

tldr-pages: linux/conntrack

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