Update dynDns record periodically

September 20, 2008

I’ve the IP of my dnyDNS record updated via a script in /etc/ppp/ip-up.d/ on my router but sometimes (not often) the ppp connections seems not to be fully up or due to some other problems the update of the IP address does not work. In this case the system is not reachable until the next time I reconnect. I know I can run ddclient as daemon, but I wanted something lighted and easier.

I’ve written a small python script which gets the current IP address of the ppp connection and calls the ddclient to update the IP to the provided one. My script is called by cron every half an hour. This also guards against the problem that I get no disconnect in 3 month (I think it was something in this time frame) and dnyDNS disables my account.

Download the setdyndns.py script. Change the external network interface to your setting in the variable networkInterface.

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