Hey guys had to do a complete re install on my media server this morning and for some reason I cannot  connect to the net with it if I set the machines ip address. It connects to the modem ok and I get the ip I want which is 192.168.1.100 but no net access, I have tried every combination for the default gateway section 115.188.64.1 (as stated in the modems ui) , also tried 192.168.1.254 but none of these is working.
Is there a way to assign an ip address to a machine via the modem at all (cannot find an option for this) , I used to be able to set an ip address by the mac address on my old modem but cannot seem to find this sort of option on this new one.