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iPad 5GHz Ad-Hoc (Computer-to-Computer) Networking

5406 Views 2 Replies Latest reply: Jul 8, 2011 2:17 PM by richardJB RSS
jesmith Level 1 Level 1 (10 points)
Currently Being Moderated
Mar 10, 2011 10:29 AM
I think I've just made a discovery, but I cannot find any confirmation of this on line:

-> The iPad (1) does NOT support AdHoc networking at 5Ghz

On my MacBook Pro, I do "Create Network". If I select a channel 1-11, I can connect to this network from the iPad. If I select a channel 36-44, the iPad says "Unable to Join Network." Note that System Profiler tells me that the AdHoc network is 802.11n.

On a Linux system I have, I can create an 802.11a (not "n") AdHoc network at various other 5Ghz-range frequencies, and I get the exact same problem when trying to connect with the iPad.

I can connect the MacBook Pro and Linux systems to each other using the 802.11a AdHoc networks, by the way.

This problem existed in iOS 4.1, 4.2, and continues to exist in 4.3.

Note that I cannot do an equivalent test with an iPod Touch, because that doesn't have a 5GHz radio in it.

I will update this post on Monday when I can test on a new iPad 2. I haven't seen any info on whether they might be using a different chipset in those, but it seems likely.

Does anyone know if this is an acknowledged limitation of the iPad? I haven't been able to find any references on the subject.

iPad 1, iOS 4.2, iOS 4.3, iOS 4
  • richardJB Calculating status...
    Currently Being Moderated
    Jul 8, 2011 2:17 PM (in response to jesmith)



    I am experiencing this,too.  We use the iPad to connect to our devices (which have dual band wireless built in) for streaming video.


    When using any of the 5GHz channels, the iPad typically refuses to connect to the network, simply saying that it is unable to connect.  Sometimes, though, it appears to connect without issue, but never transmits or receives any network traffic. Trying to renew the DHCP lease does nothing either, no traffic is seen.


    The same thing is observed when trying to connect to a network created by my Mac (both Mac Mini and MacBook Pro).  Most of the time the iPad refuses to connect, sometimes it appears to connect but cannot communicate with the Mac.


    Another thing to add, I have also experienced some strange connection issues with connections in the 2.4GHz range.  Sometimes the iPad will connect in 802.11n mode, sometimes in 802.11g.  When it does connect in the 'n' mode, the connection quality seems to be poorer (more dropped or out-of-order packets) than in the 'g' mode.


    None of these issues are observed when using a wireless access point.


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