I have a SMB (small-to-medium-business) router (router x) that my workstations run off of in my small business. I wanted to offer my customers wireless internet while they wait for service so I installed an extra wireless router (router y) laying around at home. I plugged router y into router x so router x with IPs on the 10.0.0.0 network are assigned to all the workstations and router y. So for example router y has IP 10.0.0.128 assigned by router x by DHCP. When a user connects wirelessly to router y they are assigned an IP by DHCP on router y off the 192.168.0.0/24 network.
My question is: will anyone connected to my router y on the 192.168.0.0/24 network be able to tunnel their way into my 10.0.0.0/24 network through router y?
This is a very similar question but the only difference perhaps is that it's a wifi AP and not another router. Attaching hotspot to existing network - can it be secured?