arpoison ☆

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Description:
UNIX arp cache update utility

Type: Formula | Latest Version: 0.7@1 | Tracked Since: Dec 17, 2025

Links: Homepage | formulae.brew.sh

Category: Networking

Tags: networking security utility cli arp

Install: brew install arpoison

About:
arpoison is a command-line utility for UNIX-like systems designed to manipulate the ARP (Address Resolution Protocol) cache. It allows administrators to manually add or update ARP entries, enabling the mapping of IP addresses to MAC addresses. This tool is particularly useful for network testing, troubleshooting connectivity issues, and simulating network environments.

Key Features:

Manual ARP cache manipulation
Support for adding and updating entries
Command-line interface for scripting
Uses libnet for packet construction

Use Cases:

Troubleshooting network connectivity by forcing ARP entries
Testing network security configurations and ARP spoofing detection
Automating network setup in lab environments

Alternatives:

arp – Standard system utility often limited to viewing cache; arpoison provides explicit injection capabilities.
scapy – Python-based packet manipulation tool that can handle ARP but is much heavier and requires a scripting environment.

License: GPL-2.0-only

Dependencies: libnet

Bottles available for: arm64_tahoe, arm64_sequoia, arm64_sonoma, arm64_ventura, arm64_monterey, arm64_big_sur, sonoma, ventura, monterey, big_sur, catalina, arm64_linux, x86_64_linux

Version History

Detected	Version	Rev	Change	Commit
Sep 13, 2025 8:19am		1	VERSION_BUMP	a76cc8ce