In my experience, the IP addresses are Nat pooled. But this is definatly carrier dependant. What they tend to do is to open a hole in the firewall and leave it open for 2-3 min without activity and then close it. So what I do is send keep alives (1 byte packets will do) every 90 seconds. This keeps the address and makes sure that they don't charge you for opening a new connection.
Sent from my BlackBerry® wireless handheld -----Original Message----- From: Brandon Kruse <[EMAIL PROTECTED]> Date: Mon, 19 May 2008 00:33:14 To:List for Openmoko community discussion <[email protected]> Subject: Re: GPRS IP Networking Either way, you could write a simple program on the phone to keep connecting to an end point (server) and give the server reverse access (stunnel) back to the device. Just what I'm thinking :) -- Brandon Kruse On May 18, 2008, at 8:22 PM, "Steven Kurylo" <[EMAIL PROTECTED]> wrote: > Does someone know how IP addresses are handed out on the cellular > network? Do they give each phone an IP address, or do they do NAT? I > want to know if I'll be able to connect to my freerunner over GPRS, > say I wanted to ssh into it. > > I've been searching the internet and haven't found an answer. I > connected to my website with my blackberry and saw different IP > addresses for different requests; makes me think they have an outgoing > NAT pool. Of course this could also be carrier dependent. > > Thanks. > > -- > Steven Kurylo > > _______________________________________________ > Openmoko community mailing list > [email protected] > http://lists.openmoko.org/mailman/listinfo/community _______________________________________________ Openmoko community mailing list [email protected] http://lists.openmoko.org/mailman/listinfo/community
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