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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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[–] h4xx@sh.itjust.works 1 points 1 year ago

All you need to do is add a static route to your fritzbox for 192.168.1.0/24 via 192.168.1.x, where x is the wan ip of the openwrt router and then add a firewall rule in openwrt to allow either all traffic or add specific rules/ports from wan to lan. Another way, if you only need ssh is setup portforwardimg im openwrt so that wan port tcp 22 is forqarded to 192.168.1.30 and then connect from 192.168.178.10 to the wan ip of the openwrt router, which will forward it.