Apple devices can’t access internet via SonicPoint
If you have an iPhone or an iPad that cannot access the internet through a SonicPointNDR you came to the right place. I had a SonicPointN and everything worked fine for all of our devices.
I then upgraded to a SonicPointNDR and only the iPhone couldn’t access the internet. No matter what DNS settings or firewall rules I tried.
The trick is to disable Aggregation on the Radio settings. As soon as I did this and pushed the changes to my SonicPoints the iPhone was able to get online.
Here are the details from SonicWall on the known issue:
Description of the problem:
iPad having compatibility issues with SonicPoint - N and internal radio impacting page redirect failures to internal Wireless Guest Access and External LHM
Disable Frame Aggregation.
For SonicPoint N , go to SonicPoint->SonicPoints , edit SonicPoint N provisioning profile that is being used and under "802.11n Radio" tab, disable the check box
For internal Radio models, go to Wireless->Settings and disable the check box "Enable Aggregation"
iPad has an interoperability issue with 802.11n Frame Aggregation setting on SonicPoint-N. Without aggregation enabled in 802.11 n/g/b mixed mode, the iPad
always sends back TCP ACK for TCP SYN-ACK and thereafter receives HTTP redirection promptly.
With aggregation enabled in 802.11 n/g/b mixed mode, the iPad can get DHCP offer from SonicWALL-SonicPoint, but seem having problem with the unicasting packet
coming from the SonicPoint. As a result, iPad will not ACK the TCP SYN-ACK from SonicWALL to cause redirection page failure.
Since iPad does not have the 802.11n high throughput capability anyway, the aggregation should be turned off in 802.11 n/g/b mixed to prevent this kind of
interoperability issue. In pure 802.11 g/b mode (without n) of SonicPoint-N, this issue will not happen at all.
Apple also acknowledged that iPad and Mac Computers do not support 40Mhz Wide channel in 2.4 Ghz
For additonal information, please refer : http://support.apple.com/kb/TS3237
For DHCP lease related issues for iPad, please refer to the following: http://www.net.princeton.edu/announcements/ipad-iphoneos32-stops-renewing-lease-keeps-using-IP-address.html