How to Detect IP Address Conflicts with arp‑scan on Linux
This guide explains why IP address conflicts happen, how the arp‑scan tool works to discover duplicate IP assignments on a local network, and provides step‑by‑step commands for installing and running arp‑scan on Ubuntu/Debian and Fedora/CentOS/RedHat systems.
IP addresses identify devices on a network and can be dynamic or static. Conflicts occur when two devices claim the same IP, often due to DHCP issues.
arp‑scan sends ARP packets on the local network to discover which MAC addresses claim each IP, revealing conflicts.
Install arp‑scan:
sudo apt-get install arp-scansudo yum install arp-scanRun the scan (replace eth0 with your interface): sudo arp-scan -I eth0 -l Sample output shows MAC addresses and vendor names; duplicate entries indicate an IP conflict. In the example, 192.168.1.39 appears twice, confirming a conflict.
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