dynamic ip update script with no dydns server

I was looking at the DIP Update by http://dip-update.lastdownload.com/ out of intrest
That is a Dynamic IP  script that updtes an ever-changing IP address and got the idea of making a php script
 
that would do a simmilar job independant of any dydns service providers
basicaly what it does is fetches your external ip address of your local server
updates a remote mysql server were a link can be updated on a webpage if requierd to your local server,

However if the script is installed on two servers that have dynamic ip address and they can access the remote Mysql database they
can access each others servers that have dynamic ip address
Anyway the script can be found here on my server also their is some docs
and if you have probs obtaining your external ip
iv included a java prog to retreave your ip address that you can enter manualy

use the pasword jura to open up the zip file

http://juraphotos.photofxr.co.uk/upload/file.php?id=3

their is some more docs their as well somthing that im not to good at
hope it might be of use to someone

and why do we need that?

I used to use a simillar script to parse data local and save them to the server. Of course this is not the best practice that someone can use, but it is good when you are on a non static ip connection.