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Setup Tutorials

How to validate your IP automatically using a DD-WRT router

Some ISPs do not give their clients a static IP. Therefore your IP might change from time to time. If that’s your case and you want to set up Smart DNS manually, you will have to validate your IP manually each time you want to use Smart DNS.

It’s not a problem if you use our app as it has an Automatic IP update feature.

If you still want to set up Smar DNS manually, to validate the IP automatically, you will need a a DD-WRT router and to follow these instructions step-by-step.

  1. Open your DD-WRT router settings.

  2. Go to Administration -> Management, and scroll down till you see the section CRON.

  3. Add the following rule:

    */[x_min] * * * * root wget [VALIDATE_IP_LINK]


    Replace [VALIDATE_IP_LINK] with your Validate IP Link.

    To find it, sign in to your account on our website, go to Settings -> Validate Your IP Address, find the box Validate your IP using a web address.

    Replace [x_min] with the periodicity of the validate in minutes. For example: 5 – for 5 minutes; 120 – for 2 hours.

    An example how your rule must look like:

    */5 * * * * root wget http://smartdns.cactusvpn.com/index.php?smartkey=4894fcaa1fe9fcff5gwt853fd11f

    This will validate your IP every 5 minutes.

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