if the statement "I concluded that this is not allowed when using a
non LAN connection." were true, all RTP apps would fail on 3G
networks. but most if not all of them seem working well.

meanwhile, servers requiring *persistent tcp connections* may have
scalability issue.

On Jul 1, 3:18 pm, Miguel Morales <[email protected]> wrote:
> I was never able to receive udp packets from my server onto my phone
> that's connected a 3G network.
> I concluded that this is not allowed when using a non LAN connection.
> Phone to phone TCP works from what I've heard, but frankly I don't see
> the advantages unless your game REALLY needs it.
>
> What works for me is of course having all players communicate via a
> common server and try to have the latency as low as possible.
>
> There was a thread about this where I gave my two cents and
> experience.  I use a combination of perl, erlang/rabbitmq, and java.
> You can find the thread 
> here:http://groups.google.com/group/android-developers/browse_thread/threa...http://groups.google.com/group/android-developers/browse_thread/threa...
>
> Miguel.
>
>
>
>
>
> On Thu, Jul 1, 2010 at 9:40 AM, HeHe <[email protected]> wrote:
> > i would suggest that you try udp with your app because, against the
> > same well-designed nat, often a very good tcp "hole punch" technique
> > has a much higher failure rate than a fair udp one.
>
> > On Jul 1, 8:44 am, WuffIT Tech <[email protected]> wrote:
> >> I understand that the IP is subject to change but that is not my
> >> concern.  If a connection is dropped, I can always send the other
> >> phone my IP address and reconnect.  I have come to the conclusion that
> >> there is not a way to do this without actually using a third party
> >> server.  My question now is how should I implement this server.  Any
> >> good server examples out there that is similar to what I need?  My
> >> overall objective is to have a server that will route a message from
> >> one phone to another like an IM program.
>
> >> On Jun 15, 5:47 am, Matthew Powers <[email protected]> wrote:
>
> >> > I would worry about your IP address changing as you move in and out of
> >> > different networks, your IP address is not constant
>
> >> > On Thu, Jun 10, 2010 at 2:40 PM, WuffIT Tech <[email protected]> wrote:
> >> > > Hi,
>
> >> > > I am new to this forum and I would like to throw out this question and
> >> > > hopefully someone can point me in the right direction. I am developing
> >> > > an Android application and I would like to setup a tcp/ip type of
> >> > > connection between two Android phones using the 3G/Edge network. My
> >> > > test version will establish a connection if I have both phones on a
> >> > > lan using wifi but when I use T-Mobile's network a connection is not
> >> > > established. Could this issue be a port or ip address? Thanks in
> >> > > advance.
>
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>  ~Isaiah 55:8-9

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