Executing a script when DHCPD give an IP

You can find the answer here:

• http://ubuntuforums.org/showthread.php?t=1328967

Here's the copy-paste from the above link:

on commit {
        set ClientIP = binary-to-ascii(10, 8, ".", leased-address);
        set ClientMac = binary-to-ascii(16, 8, ":", substring(hardware, 1, 6));
        log(concat("Commit: IP: ", ClientIP, " Mac: ", ClientMac));
        execute("/usr/sbin/my_script_here", "commit", ClientIP, ClientMac);
}

It might be different for different versions of Linux, but should give you the idea.

See here for another example:

• https://lists.isc.org/pipermail/dhcp-users/2008-September/007167.html

man dhcpd.conf should also give you more information.

Baiscally, you want to use on commit and execute inside it to specify a script to be run.