The AndAppStore server logs show a small range of IP addresses serving 
all G1 requests, which possibly backs your feeling that there is a NAT 
in the infrastructure somewhere.

It is possible that the small range are just caching proxies and any 
non-HTTP traffic goes direct to the net, but given that having a unique 
publicly accessible IP address per phone would be a bot-net writers 
dream I'd say that listening sockets on a G1 are going to be pretty much 
useless as a means for push notifications.

Al.


Mark Murphy wrote:
>> If I open a datagram socket to listen on a particular UDP port and
>> leave it open but don't send anything, does that keep the radio on?
>>
>> If a listening socket doesn't keep the radio on, then an application
>> could send a couple packets to register it's IP and port and then shut
>> up and wait for incoming requests.
>>
>> Thoughts?
>>     
>
> I doubt there's a unique IP address per phone on a carrier data network --
> it feels like too many addresses would be needed. It's probably NATted or
> the equivalent. Hence, I'm not convinced a phone can serve as a server
> (TCP or UDP) without help, a la P2P NAT-traversal systems.
>
> But, then again, I've certainly been wrong before...
>
> --
> Mark Murphy (a Commons Guy)
> http://commonsware.com
> _The Busy Coder's Guide to Android Development_ Version 1.4 Published!
>
>
>
> >
>   


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