Route Wifi Invité

I have two networks with subnets192.168.1.0/24 and 10.0.0.0/24 and I want to link them together so 192.168.1.2 can ping 10.0.0.2 without going through a proxy

I do not have access to either router and I cannot connect the routers or bring in another one. my laptop has to act as the router.

Can I do this with as little configuration as possible?

Routers route between subnets.

First, you need two interfaces/NICs, one connected to each subnet. For Windows 10 to enable routing you need to edit the registry. In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters you change the value for IPEnableRouter to 0001. If that value is missing create a REG_DWORD with that name. Reboot.

In each subnet, point a specific route to the other subnet to the laptop interface, e.g. with the laptop using 10.0.0.99 and 192.168.1.99 and Windows machines:

route add 10.0.0.0 mask 255.255.255.0 192.168.1.99 -p

or

route add 192.168.1.0 mask 255.255.255. 10.0.0.99 -p

The -p makes that route entry survive a system restart/persistant.

If you need Internet access from the subnet not connected directly to your WAN router, you need to tell that WAN router about the remote subnet as well (same route as above) and use the laptop interface on the remote subnet as default gateway.