Interestingly, this is now working as expected. Not sure what was going on last 
night, but I couldn't get it to behave.

On Jul 11, 2013, at 16:40 , Rick Mann <rm...@latencyzero.com> wrote:

> I sent this yesterday to macnetworkprog, but I wonder if this list might 
> reach more people who've encountered the issue before...
> 
> ---
> 
> I'm working on an iPad app to control a device. In one possible 
> configuration, the device hosts a Wi-Fi network and the user connects the 
> iPad to it. The device has a DHCP server and provides an IP address and 
> subnet mask to the iPad, but does not provide a Router or DNS or other 
> information. We are able to successfully make TCP connections to the device 
> over Wi-Fi.
> 
> If the iPad also has a cellular data plan, we want to connect to our server 
> (this is a server in the cloud, not the device) via that cellular data 
> connection. But the SCNetworkReachabilityFlags I get back are 0 (unreachable, 
> not WWAN). Attempts to connect to our server fail. Attempts to use Safari to 
> connect to the internet fail.
> 
> Is there something about what our device is providing via Wi-Fi that prevents 
> the iPad from figuring out how to route traffic? Is it not possible to split 
> network operations this way? I thought it could do this, and this is critical 
> to our product's ease of use.
> 
> Thanks,
> 
> -- 
> Rick
> 
> 
> 
> 
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-- 
Rick




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