LINUX: How do I check for duplicate IP address

Linux doesn’t do an active monitoring or reporting of duplicate ip, after the interface is initialized. To check for duplicate IP addresses in Linux:

Log into your server via console and from the command line run

arping -D -q -I eth0 -c 2 192.168.1.250 ; echo $?

If the above commands return 0, then no one responded to your arp request and therefore no one else is using your IP address.