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I'm suspecting a poisoned DNS cache on your router, or maybe some malware on your router. If you put the iPad DNS setting back to 192.168.0.1 but restart the router, does the problem persist?
Interestingly, the wired segment your desktop is connected to uses a different IP subnet than the wireless one and gets a different DNS server. What do the network settings on the laptop look like?
You can keep using the Google DNS server, but that comes with a few drawbacks. Besides latency you will also not benefit from localised content delivery networks. This means media and other downloads may be slower because they come from overseas instead of servers in AU or nearby.
However, if you can find out your ISP's DNS server addresses you should use those. You can most likely also configure the DHCP server component on your router to hand them out, instead of 192.168.0.1 or .1.1, thereby eliminating any router DNS functionality from the equation.
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