libnetfilter_conntrack ☆

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Description:
Library providing an API to the in-kernel connection tracking state table

Type: Formula | Tracked Since: Dec 28, 2025

Links: Homepage | formulae.brew.sh

Category: Networking

Tags: networking firewall linux netfilter security

Install: brew install libnetfilter_conntrack

About:
Libnetfilter_conntrack is a userspace library providing a low-level API for interacting with the in-kernel connection tracking system (conntrack) and the userspace conntrack daemon (conntrackd). It enables applications to query, manipulate, and receive events about stateful network connections, such as NAT and stateful firewalls. This library is essential for building custom network monitoring and management tools on Linux.

Key Features:

API for kernel connection tracking table
Support for connection state manipulation
Event-based notification for connection updates
IPv4 and IPv6 protocol support

Use Cases:

Building custom firewall management utilities
Developing network monitoring and intrusion detection systems
Synchronizing connection states between firewalls for high availability

Alternatives:

conntrack-tools – Provides the command-line user interface (conntrack) and userspace daemon (conntrackd), whereas libnetfilter_conntrack is the underlying library used to build such tools.

Version History

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