"Very often a network administrator is left in the complete ignorance by the Linux kernel and needs to troubleshoot IP conflict the hard way.
An IP Address Conflict GUI dialog triggered by IPwatchD Daemon
"Fortunately, there is a simple daemon called IPwatchD which main purpose is to catch and evaluate ARP packets on the network and this way is able to prevent an IP conflict occurrence. This is done by help of libpcap library. IPwatchD daemon is written in C language and can run in passive or active modes. The difference between a passive and active mode is that in the passive mode IPwatchD only logs every IP conflict event by engaging syslog daemon, and in active mode IPwatchD takes one step further and responds to Gratuitous ARP request which is the main construction block when it comes to the IP conflict prevention. This article will explore this simple daemon in terms of installation, configuration and usage."
