I’ve run in to an odd issue with Apple iOS devices since iOS 16.
TL;DR - something about the Draytek DNS proxy appears to break Safari and most apps. Configuring devices to use the router itself as DNS server instead of external DNS servers resolves this.
Config - FFTC PPPoE, LAN 1 DHCP enabled with OpenDNS configured as primary and secondary DNS servers. This works normally with iOS up to and including v15.
As of the devices getting iOS 16, Safari works only sporadically and apps like Twitter etc just hang on refresh. Usually will work for a short time after connecting to the network (note, 3rd party Wi-Fi, Unifi).
After some troubleshooting I discovered that the devices would work normally if configured to use the router address itself for DNS, or any other internal DNS server, instead of OpenDNS.
So work around is to configure LAN 2 DHCP with the OpenDNS servers, then configure ‘Force router to use "DNS server IP address" settings specified in LAN2’, and finally configure LAN1 DHCP scope to issue the router address itself for both primary and secondary DNS servers.
The result is that the router is the client DNS server and the forwarders are the OpenDNS servers.
Hope that helps. Mystifying to me as to why there is nothing else posted about this.
