You could disable DHCP on your router, and then grab some free/opensource DHCP server software for a computer and run it on your network.
That's too much trouble for such a problem.
Btw do you know what the "Auto-IP enabled" do?

Takes like 5 minutes to setup software DHCP. Just figured it might make your life a little easier.
AutoIP, almost sounds like DHCP. I dunno. is it this:
http://lwip.wikia.com/wiki/AUTOIP ?
What router are you using??
I'd rather fix the problem at the router end if possible.
It is a Technicolor TG582n.
For example if a local machine is given an arbitrary IP address from the DHCP pool and then I select "Always use this IP address" then there is no problem.
But the only way to force my miners to get IP addresses in a row is by setting them all static. Unfortunately the router decides to change that later on for no reason
