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Can anyone explain how to edit dnsmasq.conf on an ASUS RT-AC66U to remove the text below: #Option Router dhcp-option=3 Also, I read that changes are lost when the router restarts as the file is reset back to a default version. Clueless here, and would appreciate some pointers please.

Well? Someone posted a reply to this thread, and then it disappeared (I'll assume they wanted to help anonymously, so I'll just say thanks without naming them): It works with iPhone if you remove the following option: #Option Router dhcp-option=3 Comment that out and iPhone can connect...

I disabled IPv6, assigned a static IP from the UniFi DHCP server and turned off network privacy on the iPhone but still no connection. The iPhone does not appear to get a reply from the UniFi DHCP server, or the DHCP request is not reaching the UniFi DHCP server, so an iPhone only connects if IP...

Nope, I never did. I bought two UniFi Access Point WiFi 6 Lite devices and have wired the first in to replace an ASUS repeater elsewhere, which has worked better for WiFi roaming. The remaining UniFi AP will replace the ASUS device that is the topic of this discussion. Sure, wiring the ASUS...

I also have a Victron inverter connecting successfully to the RT-AC66U repeater, and the inverter IP & DNS addressing are both set to Auto - so Windows and this non-Apple device can use DHCP ok. Diagram updated again... It's just iPhones and iPads that have to be manually IP-addressed. A...

I've reset the Apple devices' network settings, and even reset the iPhone 6S completely - still no connection to the AC66U unless IPs were manually set. In repeater mode there's not a lot that can be set on the AC66U - just the SSID it's connecting to and the name and creds of the 2 & 5 Gig...

Thanks @ColinTaylor but I do not see an option in the RT66U for a guest network, or "WiFi Professional" or an "AP Isolated" setting when in Repeater mode. I think they are only available in wired AP mode. @OzarkEdge this is the only device I currently have that can be configured as a repeater...

Yip, the UDM is the latest firmware. And I've scoured the settings to see if there's anything in the ASUS that could prevent it relaying DHCP requests, but cannot find anything. It is strange that a DHCP request from a Windows laptop does get relayed from the AC66U to the UDM, and the reply gets...

@OzarkEdge and @Ronald Schwerer I have tested with "Private Address" on and off on iPhones and iPads, but in both cases Apple mobile devices just do not get an IP address when set to "Configure IP: Automatic" and "Configure DNS: Automatic". The DHCP server only issues one reserved IP address to...

@sfx2000 and @OzarkEdge - I have corrected the diagram to show that the ASUS RT-AC66U is connected via WiFi to the UniFi Dream Machine. The AC66U is 20m from the Dream Machine, and configured as a WiFi Repeater, not an Access Point. I'm baffled why the Apple devices cannot get an IP address...

Please help - Any ideas why Apple devices cannot use DHCP, or how to troubleshoot this? Thanks

DIAGRAM UPDATED Apple devices cannot connect to an ASUS RT-AC66U configured as a repeater when set to use DHCP-assigned IP addresses - they can only connect when using statically-defined IP address settings (IP, mask, router IP & DNS). Why is this not working with DHCP-assigned IPs for Apple...