I'm having a bit of a dumb moment here, where I'm struggling to deploy the following set up in my house:
1. I have a primary router, an Asus RT-AC66U (running modified Merlin FW), connected to a Vodafone (old TCL) Cable box, with Vodafone DNS settings.
2. I now want to connect a secondary router, a Cisco E4200 (running modified Tomato FW) to the AC66U, so that I can plug in my Roku 3 and Chromecast to UnoTelly but:
a. I want all devices connected within the second router to be on the same subnet as the first router (192.168.1.x), rather than two subnets (192.168.1.x for the first and 192.168.5.x for the second)
b. I want all devices connecting through the second router to have different DNS settings than the first router
I want this set up because I want to the Roku 3 and Chromecast to be discoverable under the same network. Otherwise, I have to switch networks with my mobile devices/computers in order to be able to stream through the Roku or (especially) the Chromecast.
Is there a way to do this? When I switch off DHCP in the second router and turn it to router mode, I'm able to have all devices connecting through the same subnet (192.168.1.x), but the devices don't seem to pick up the DNS settings I stick into the Cisco. So while I can get the second device operating like a switch, I cannot seem to force devices connecting to the second router to use the DNS server I want them to.
I realise that there is another easier alternative: using IPTABLES in the first router to just force DNS settings on particular devices, and sticking to just one router. But somehow, ever since the Netflix problem started up, I cannot use Netflix on the Roku when I do this, even though I can all other services like Hulu+, and Amazon. Netflix on the Roku *only* works when the whole router's DNS settings are configured to UnoTelly... suggesting that there's some leakage that I am unable to catch.
Any ideas / help would be welcome :)