|Subject:||Question about NAT|
|From:||"Paul Arch" <paul,AT,sdmgroup,DOT,com,DOT,au>|
|Date:||Sat, 18 Oct 2003 17:33:41 +0800|
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.