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I have a master modem router (Netgear N300) and a slave router (Linksys WRT1900ACS).

When I connect master LAN to slave WAN via ethernet any devices connected to the slave do not get any internet connection.

When I connect master LAN to slave LAN any devices connected to the slave do get internet, but when I look at connection info I see they are connecting through the master router. This is not what I want. I want it to connect through the slave router.

I am not network expert but my understanding was that the right setup is master LAN to slave WAN. If that's the case, why is the slave not getting any internet connection but works fine LAN to LAN?

Some info on each:

  • Master is on 192.168.0.1. DHCP range from 192.168.0.20 to 192.168.0.100
  • Slave is on 192.168.0.2. DHCP range from 192.168.0.101 to 192.168.0.254
  • You should check here. The long and short of it is that consumer grade firewalls are not intended to be configured this way and you will have problems with it. – Cliff Armstrong Aug 7 '19 at 16:55
  • Double NAT may be bad, but it works. Are you sure the innermost router is actually set up correctly? It may be trying to dial a PPPoE modem or whatever. It needs to do DHCP. – Daniel B Aug 7 '19 at 16:56
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It sounds like your "slave router" probably has NAT (NAPT) or at least IP forwarding enabled, so it's not just acting as a switch and transparently bridging between WAN and LAN. It's actually acting as an IP-layer router between WAN and LAN. If that's the case, it needs to have two separate IP subnets out WAN and LAN. So if you want to use the 192.168.0.0/24 subnet on its WAN side, you need to use a different subnet, say 192.168.1.0/24 on its LAN side.

It sounds like you're currently trying to use 192.168.0.0/24 on both sides of that router, which means it won't know how to route packets to 192.168.0.x addresses; should it send them out its WAN port, or its LAN port? There's no good way to know, so it chokes.

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