How to: Detect Duplicate IP Address With arping command under Linux

To detect a duplicate IP address on a network using the "arping" command in Linux, you can use the following steps:

1. Install the "arping" command: If the "arping" command is not already installed on your system, you can install it using your distribution's package manager. For example, on a Debian-based system, you can use the following command:

sudo apt install arping

2. Identify the IP address you want to check: Determine the IP address that you want to check for duplicates on the network.

3. Run the "arping" command: Use the "arping" command to send an ARP request to the IP address you want to check. For example:

sudo arping -c 1 192.168.1.100

This will send an ARP request to the IP address "192.168.1.100" and wait for a response.

4. Check the output: If the "arping" command receives a response from the IP address, it will indicate that the IP address is in use on the network. If the "arping" command does not receive a response, it will indicate that the IP address is not in use.

For example, if the IP address is in use, the "arping" command will display output like this:

Sent