[ Thanks to linuxconfig for this link.
]
“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.”