RT-AC68U behind RT-N66U cannot use the Internet

[Digital Anomaly]

I currently have the following setup:
RT-N66U (latest Merlin) connected to Internet (192.168.0.1)
RT-AC68U (latest Merlin) connected to RT-N66U (192.168.0.2 / 192.168.1.1)
RT-N12 C1 (DD-WRT) using PPTP VPN and connected to RT-N66U (192.168.0.3 / 192.168.2.1)

I have this set up this way since I limit the bandwidth of the AC68U and N12 separately through QoS and use the N66U as my private connection when I want to hog all the bandwidth. As mentioned earlier, I also use the N12 as a dedicated VPN connection.

Now, if I set up the AC68U as a Wireless Router (default setting) and have DHCP working so I am able to subnet my clients but none of them are able to connect to the Internet. If I set it as an Access Point, I am able to get Internet but it uses the main router's DHCP which completely ruins my subnetting.

The RT-N12 works fine at least.

Someone help me, I'm about to bang my head against the wall. x.x

 

[Daybreak]

Howdy,

It sounds like you need to set the gateway and dns on the ac68 to point to the master router's ip address.

AC68 setup as a static IP wan connection of 192.168.0.2 with gateway at 192.168.0.1, and dns at 192.168.0.1, with it dhcp server giving out 192.168.1.x

 

[Digital Anomaly]

Thanks for the reply.

Unfortunately, that didn't fix it.

The N66U actually has the MAC addresses of the AC68U and the N12 and it assigns them a static IP through DHCP which in effect, assigns the correct DNS and gateway IP (192.168.0.1, also seen in my client's network adapter settings when connecting to the AC68U).

I tried removing the AC68U from the static DHCP pool of the N66U and manually set Static IP on the AC68U with the IP 192.168.0.2 and the gateway/DNS to 192.168.0.1 but still no cigar.

FYI, the AC68U actually has internet (can ping google.com from the Network Tools)

 

[Asmodian]

Shouldn't the clients connecting to the AC68U use 192.168.1.1 for the gateway and DNS?