All i did was open the Network settings in the hickvission DVR and added a IP a higher number in case other devices in the network create a conflict,,
Then in the GATEWAY i added the IP of the router, which also is the same IP i use to access the GUI, and then i added the WIFI login and password details in the PPoE i think its called, all this worked last year until we got a new ISP.
Also, I did not touch anything in the DHCP,
Also as well just to know, i dont use PCs as which is a disadvantage becuase when i try to log into the DVR via the IP in firefox im stuck in the login screen, the DVRS GUI will not show up, EVER., but it works on a PC.