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Router behind a router - how to connect two networks? (feddit.de)

submitted 1 year ago by glasgitarrewelt@feddit.de to c/networking@sh.itjust.works

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Hello! As a complete beginner in home networking I am a bit lost with my problem. Maybe someone can help:

Setup: Internet socket in the wall -> Fritzbox-router -> Linksys router with OpenWRT and a VPN (NordVPN)

I have to Networks I can connect to, the Fritzbox-Network (192.168.178.) and the OpenWRT-Network (192.168.1.). Most PCs/Smartphones are connected to the OpenWRT-Network to be a bit more protected with the VPN. Some are connected to the Fritzbox.

Now two questions:

How can I connect those two networks so that I can e.g. ssh from 192.168.178.10 to 192.168.1.30?
Who is providing the DNS, when I connect a PiHole to the Fritzbox, set it as DNS-Server and then connect my PC to the other network, which is routing everything to NordVPN? Does NordVPN use its own DNS-Server?

What do I need to learn to understand my own network better?

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[–] Helix@feddit.de 4 points 1 year ago* (last edited 1 year ago)

Use one as the DNS and DHCP server and the other one as switch and access point.