Date printed: 12-02-2023   Last updated: 02-19-2008

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Applies to versions: 1.3, 1.4, 1.5, 1.6, 1.8, 1.9, 1.10, 1.11, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 3.0, 3.1, 3.2


This article describes how to use the DynDNS service to work around a non static (dynamic) IP address.

Depending on your specific implementation you may have TimeIPS client stations that reside outside of your local area network. In this configuration the ideal solution is to obtain a static (fixed) public facing IP address from your Internet Service Provider (ISP). Some business level accounts may include a static address. Please check with your provider for details. If your ISP does not offer an option for a static address at your location you can typically work around non fixed IP addressing (dynamic) through the use of a third party service called DynDNS.

Note: At the time of the creation of this document DynDNS offered it's basic services free of charge to individuals. Please review and respect any and all terms of service outlined on the DynDNS website which can be found at


What is DynDNS and how does it work?

The name DynDNS stands for Dynamic Domain Name System (DNS). You can think of a domain name as being a bridge between a name and a number; for example when you type a domain name like: into a web browser DNS translates this domain name into an IP address like If your ISP does not provide a static address to your modem you can use DynDNS' services to maintain a domain name that is always pointed to your local network. Dynamic DNS works by running a piece of software on your network that updates the DNS servers at DynDNS of changes that occur to your public facing IP address.


Here is an example:

You have registered the domain name of and it is currently being pointed to your public IP address which is Overnight your ISP renews the IP address leased to your DSL/Cable modem changing it to Upon seeing the change on your network the DynDNS Updater software contacts out to the DynDNS servers telling them that is now located at; thus requests made to your domain name are always able to reach your local network regardless of changes made to your public IP address.


The steps to setting up DynDNS are as follows:

  1. Register an account on the DynDNS website located at
  2. Decide where you would like to run the DynDNS Updater software. There are two ways of running the updater, most modern routers provide native support to DynDNS services. Check the documentation for your particular router model for details. Direct support via a router is the easiest and most effective method. However, if your router does not provide this feature you can also run the DynDNS Updater software directly on a computer at your location. DynDNS provides updater software for most major platforms including Linux, Windows, and Mac OS. It is important to note that you will want to run the Updater on a computer that is always available on your network (i.e. a server or workstation that does not get turned off at night).
  3. Provide the domain name you have registered with DynDNS to the updater running at your location.

Once properly configured DynDNS will keep your domain name pointing to your local network. When setting up your remote clocks you should provide the domain name you have registered in the field labeled TimeIPS Master on the clock configuration page of the remote clock. You will also need to set up Port Forwarding rules to ensure clock events get routed properly to your TimeIPS Master Server.

See Also:
Wide Area Network (WAN) (1.4, 1.5, 1.6, 1.8, 1.9, 1.10, 1.11, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 3.0, 3.1, 3.2)
Ports Used by TimeIPS (1.3, 1.4, 1.5, 1.6)
Adjusting Client's Network Information (1.3, 1.4, 1.5)

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