Dns problem when internet range extender installef

[KevinJ2229]

Installed a net gear internet range extender. Works with Android phones but not Apple or Windows devices. These devices get a dns error when connecting to the original modem. This occurs even when the range extender is turned off. Nbn modem is Sagemcom supplied by optus

[YetAnotherAcc]

If its working on Android phones then its unlikely to be a DNS problem but rather just a general connection problem. You need to make your Apple and Windows devices use Automatic IP/DHCP for their internet connections types.

[KevinJ2229]

Checked this it was already set to automatic DHCP. The net gear extender is turned off, I restarted router and modem and problem still exists. Should I do a hard reset of the router, ie push a pin into a tiny hole at the back

[YetAnotherAcc]

Should I do a hard reset of the router, ie push a pin into a tiny hole at the back

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It shouldn't do any harm other then loosing any custom setting you have made to to the Optus router. If you do this make sure the extender is still turned off, that will eliminate the possibility of the extender causing any conflicts. 

I'm struggling to think of a reason Android works but Apple and Windows don't.