Keeping OpenDNS Updated with Ubuntu Server

In a previous post I explained how I configued my Ubuntu Server to send a tweet whenever my external IP address changed. Well I found that no only did my external IP address change with startling regularity but it was also causing my OpenDNS settings to become out of sync.

Basically in the house we have a single PC and the rest are laptops. Now I have the OpenDNS updater on the PC and this will syncronise my external IP address with OpenDNS when it is turned on – but what if the IP address changes and that PC is not turned on.? Answer, all my parental controls go out of the window!
Now I could install the OpenDNS updater on the laptops but the problem I see there is that if one of them connects to another network, via WiFi for example, then my OpenDNS settings will be updated with the networks external IP address – not what I want!
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