My desktop PC's second NIC is configured to IP address 10.0.0.2, subnet 10.0.0.0/24. Other PCs talk to each other, when I give them similar addresses (10.0.0.3, 10.0.0.4, etc.). All these PCs plug into a NetGear 100base hub.

How can I add a Nexus 7 tablet running Android 6.0.1 to this network?

My USB-to-cat5 dongle successfully connects the tablet to the internet via a router. But when I plug it into the NetGear hub instead, I see no way to specify an address like 10.0.0.5. (Were this wifi instead of cat5, then it would be easy.)

If I replace the hub with another router (which would give the tablet a DHCP address), then the host PC gets confused because it has two 192.168 networks at once: https://superuser.com/questions/1101720/if-i-have-two-routers-how-do-computers-choose-which-to-use.