Instead of changing your router settings, you can use an Ethernet crossover cable, plus a computer or laptop directly connected into the antminer, set an IP on the Ethernet port on the PC to one near the ant, then be able to program it to an IP on your network.

I run my network on a 172.x.x.x range because way too many people use 192.x.x.x or 10.x.x.x.
A few minutes with a crossover cable, set the right settings, and it matches your network.