I think I know what caused this, at the weekend I disabled DHCP after following some youtube guide without knowing what I'm doing.
Right now I can connect to my nighthawk modem/router but cant connect to the netduma. I've tried wireless and wired and switching the netduma off and on. In windows 10 the lan says "unidentified network, no internet". When I try accessing 192.168.88.1 it times out. All the green lights are flashing on the netduma itself.
I tried following this guide
and found I have no IP in ipconfig. I got to where the article says "The most probable cause for being unable to connect is that you have disabled DHCP on the router. After following the steps above" but I can't see any steps to reconnect me to my netduma.