Nag Free Dynamic DNS on Raspberry Pi •

Static IPs on the internet usually cost extra from your ISP. Many of us have dynamic IPs which change every so often. This can be annoying if you want remote access to our Raspberry Pi our home media servers. Dynamic DNS solves this by automatically registering your new IP address with a domain like crabdance.com.

I have tried several free dynamic DNS providers over the years. They have been increasingly getting annoying to manage because they nag your free account to log in once a month to reactivate their account. Fortunately, freedns.afraid.org have a completely nag free gratis dyndns service and it is very easy to setup for your Raspberry Pi home media server. If you have a separate HTPC that you don't leave on all the time then using the low powered Raspberry Pi to keep your dynamic DNS address updated without increasing your electricity bill significantly.

If you are trying to figure out which hardware would work best for you, consider reading the Pi benchmarks.

Pi Unit	Processor	RAM	RAM Bus	Network	WiFi	USB	SATA	Cost
Raspberry Pi 3	1.2 GHz ARMv8 Quad Core	1 GB DDR2	450 MHz	100 Mbit	Yes	4	No	$35
Raspberry Pi 2	900 MHz ARMv7 Quad Core	1 GB DDR2	450 MHz	100 Mbit	No	4	No	$35.00
Raspberry Pi	700 MHz ARMv6 Single Core	512 MB SDRAM	400 MHz	100 Mbit	No	4	No	$25
Banana Pi	1 GHz ARMv7 Dual Core	1 GB DDR3	432 MHz	Gigabit	No	2	Yes	$36.99
Banana Pi Pro	1 GHz ARMv7 Dual Core	1 GB DDR3	432 MHz	Gigabit	Yes	2	Yes	$45.00

Nag Free Dynamic DNS on Raspberry Pi

Create your free account and remember to click the activation link in your email.

Now log in to your new free account and choose a domain

Click subdomains on the left

Then click Add subdomain

Choose your desired username, select a free domain and click Save

Your new Dynamic DNS address will be username.chickenkiller.com, there are other domains available like crabdance.com

Free Dynamic DNS Raspberry Pi Client

You will need your Direct URL from the Free Dynamic DNS account you just created.
Log in to your account at afraid.freedns.org and click Dynamic dns on the left pane. Scroll down and you will see a Direct URL hyperlink. The link looks something like this http://freedns.afraid.org/dynamic/update.php?HTPCGuidesSecretKey.

Right click and copy the URL of the Direct Link. You can paste this somewhere safe now or you can leave the window open and switch back to it. You will need this Direct URL shortly.

We will create a cronjob to run every 5 minutes and update your free dynamic DNS with your current IP address

Paste the code below but replace the URL http://freedns.afraid.org/dynamic/update.php?HTPCGuides with your direct link URL you copied to the clipboard.

crontab -l | { cat; echo "*/5 * * * * curl http://freedns.afraid.org/dynamic/update.php?HTPCGuides"; } | crontab -

You will get a message that looks like an error but it isn't so don't worry.

no crontab for pi

To verify that the command before added the cronjob you can list the cron jobs to make sure the freedns job is there

crontab -l

It should show

*/5 * * * * curl http://freedns.afraid.org/dynamic/update.php?HTPCGuides

Restart the cron service

sudo service cron restart

I tested this several times and it is consistent, you can change the update interval by changing the */5 to */20 for every 20 minutes or whatever interval you choose.

If you are using the Raspberry Pi as a media server now you can access all of its services and programs from outside your home network. You will need to set up port forwarding of course.