I have a laptop running debian 9 with a wired NIC and a WIFI NIC. I want to connect the wired NIC to a CCTV network which the DVR has an ip 10.1.18.101 subnet 255.255.255.0 and no gateway. I can add the gateway as I want it to be the laptop. Everything on this network has a static ip address and there is no need for a DHCP server. I use a mobile hotspot on my phone which give the WIFI NIC an IP address of 192.168.43.xxx.
I have tried a few tutorials without any success and as this is just so I can get tech support hooked into the DVR to solve a more pressing issue so it will not be permanent.
I really just want to give the DVR the gateway of the laptop and configure the laptop to route between the 2 NICs so I can get internet connectivity to the DVR.
The laptop has a fresh install. I am unsure what to give the wired NIC on the laptop as a gateway and then how to make the wired NIC network 10.1.18.xxx use the WIFI NIC for internet connectivity so tech support for the DVR can hook into it via either Teamviewer or Remote Desktop.