Please explain what is not working, it is hard to judge with that limited amount of information provided.
I have my new connect box and I have to return it back, because my home network is configured completely on a totally different network (IP addresses). I don’t want to invest time to get it done by changing all my nicely set up network just because the new connect box does not allow such a simple change. The alternative would be to put a router or firewall between UPC Modem and My Network…