My mother-in-law has a Thomson TG585 v8 Router, which is the stock standard unit currently supplied by Telecom NZ with new connections.
I had serious trouble getting my MacBook Pro, iPad and iPhones to connect to the router's WiFi network. We were staying for a week on holiday, so it was a must-have to get connectivity working.
Boy oh boy what a mission.
I rang Telecom (a-la 0800 INDIA) and got told that there is a known issue with Apple devices connecting to this model Thomson router. Good start. He stepped me through turning off 802.11n, which made some improvement, but it didn't fix the problem entirely. I still had to reboot my MBP every time I woke it up from sleep, otherwise it would complain about the WiFi passphrase being incorrect.
To top it off, the mother-in-law bought an AirPrint enable printer yesterday, at my recommendation. It is the HP Photosmart e-AIO B110a, which supports AirPrint after a simple onboard firmware upgrade.
After dicking around setting up the printer onto the WiFi, getting drivers installed, and all the bundled HP crapware onto her HP laptop, I found that AirPrint didn't work on the iDevices very well, if at all. Most of the time, the iPad/iPhone would just say "Printer not found". Bad look for me and my recommendations.
We are heading back home today, so it was incumbent on me to make sure all things work before leaving! After a bit of trial and error configuring the router, I've figured out the settings that seem to work for all Apple devices, non-Apple devices, and the HP wireless printer.
Interface Type: 802.11b/g
Channel Selection: Automatic
Allow multicast from Broadband Network: (Ticked)
Use WPA-PSK Encryption: (Selected)
WPA-PSK Version: WPA2