<< | Thread Index | >> ]    [ << | Date Index | >> ]

To: "Cipe" <cipe-l,AT,inka,DOT,de>
Subject: Question about NAT
From: "Paul Arch" <paul,AT,sdmgroup,DOT,com,DOT,au>
Date: Sat, 18 Oct 2003 17:33:41 +0800

Hi,
 
 I have an embedded device out in the field which uses a GPRS connection to establish a tunnel to a static IP. 
 
 
    REMOTE DEVICE  <-------- NAT GW --------> Internet <--------- SERVER
        (10.2.x.x)                                                                      (Static IP)
 
 
As far as I know, the GPRS connection (its like WAP for mobile phones) is provided via a NAT gateway.  This is OK, and I can get everything working fine using dynip and ping on the remote device.  I have thought of it as like a road warrier, except its natting its way to the internet.
 
The thing is, cost for traffic is a big issue on GPRS - 2.2cents per 1kB of information sent and received.  And as far as I can tell, I need to specify the ping on the Remote Device to update its changing NATTED address - am I correct in this thinking ? Is there a way of keeping the 'connection' open without requiring the ping ? I am starting to think I can't since we are using UDP.
 
 Regards,
 
 Paul Arch

<< | Thread Index | >> ]    [ << | Date Index | >> ]