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EdgeRouter Lite 3 with RT-n66u AP - guest network

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dheelus

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tl;dr: How do I achieve guest wifi isolation from my primary network when using the RT-N66U as an access point?

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I've setup my ERL3 as a router with the RT-N66U as an access point. Clients can connect and browse the internet, etc.
On my ERL3, my primary subnet is 192.168.1.0/24 (yes, I should change it) and I've setup a guest VLAN with 172.16.0.0/24.
I've also setup the guest wifi networks on the RTN66U. My primary wifi is on wl0 and wl1 (2.4ghz and 5ghz, respectively). The guest wifis are on vlans wl0.1 and wl1.1 respectively.

Is it possible to setup the RTN66U with isolated guest wifi while being used as an AP? (It should be possible, the question is how do we do it?)

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Some of the things I've tried are:
1. Setup dnsmasq to make wl1.1 and wl0.1 use 172.16.0.1 (my guest network DHCP server) as the DNS. Similar to the instructions posted at https://github.com/RMerl/asuswrt-me...dicated-DHCP-options-bind-to-a-specific-SSID? (Those instructions are either bad or dnsmasq doesn't run in AP mode since I couldn't get the /tmp/etc/dnsmasq.conf file to generate).

2. Researched per threads below (but the information isn't very clear to my somewhat n00b skill-level)

https://www.snbforums.com/threads/vlan-configuration.8801/
https://www.snbforums.com/threads/works-perfectly-if-i-disable-all-authentication.12281/

 
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