Dynamic IP question

[starline250]

Hi, I'm new to this and don't know where to get an answer to this so I'm hoping someone here can help.
I run a taxi company and each cab has a PDA which connects back to our office via the GPRS network to a fixed IP address on our ADSL line back in the office. The problem is if that ADSL line goes down then communication is lost until its back up.
It would be great if the software would allow us to use a dynamic IP like the ones from noip.com but unfortunately it only accepts IP numbers. We have more than one ADSL line in the office but reprogramming the units in the cabs would be impractical. Here’s the question is there anyway to redirect an IP address. If we set all the units to say 79.123.123.123 and that in turn was directed to 79.124.124.124 then if that IP/ADSL line went down we could redirect to say 79.125.125.125 and it would be invisible to the taxi drivers. I would really appreciate your help.
Rob

 

[burtsbees]

What kind of router? The Cisco 837 (about $150 on Ebay) can do this---just make two default routes, the failover with a higher metric.

Burt

 

[starline250]

Hi Burt,
Thansk for the reply.
I can't see how that would work, having a failover ASDL won't help with incoming traffic only the outgoing. If the ADSL line goes down it will take the IP adress with it.

 

[burtsbees]

That's true...must be in the pda configuration then...

Burt

 

[robertjo24]

I assume the transport was arranged through the GPRS carrier?

If so, request diverse routing from them. They should be able to easily set this up to point to a secondary connection to your organization.

 

[starline250]

I'm sorry but what is diverse routing? How can the GPRS carrier help us? We are only using them as a route to the internet and it's not there IP we are connecting to.

 

[LawnBoy]

All of the Netopia ADSL modems I've used have a feature called IP Mapping that does exactly what you want, takes one IP and translates it to another.

The problem is, if the line is down, it won't map an ip...
You would have to get your ADSL carrier to set this up.


--
The stagehand's axiom: "Never lift what you can drag, never drag what you can roll, never roll what you can leave.