Instead the ability to automatically update the DNS server records is built into most NAT routers.
We could of course do this manually, but that would be very unreliable as you don’t know when it has changed unless you check. Now because this external IP address will change periodically we will need to update the DNS record periodically. We then assign the external IP address to the name. This name is fixed and provided by the DDNS service provider. With Dynamic DNS we assign the web server a name which we can then give to external clients. If we now introduce a Dynamic DNS service into the picture. In addition, the external client has to remember the IP address. However the external IP address IPex ( 81.157.34.43) may also be dynamically assigned by the ISP, and we cannot make it static unless we pay for a static address. If we put some typical numbers into this we will see our web server atĪll we need now do is to tell our external client to use these values. Now our web server appears to our external client to be located at IPex and on port Portex. To make the web service available on the internet we use a technique called port forwarding ( see the port forwarding and Internal vs external IP address tutorials for more details). However when making a service available on the Internet we will usually give it a static internal IP address. The Internal IP address is assigned to the internal server by the NAT router and via the DHCP service. The network diagram below shows the configuration In the following discussion we are going to assume that we want to make a web server located on an internal server available on the internet. Home networks typically uses a NAT router to connect to the internet which means that devices located on the internal network aren’t accessible from the Internet. Dynamic DNS (DDNS) -Setup and Useĭynamic DNS Services are used by small companies and individuals when they want to publish a service on the Internet, and that service is hosted within an internal or home network.
PLEASE CONFIGURE DYN UPDATER HOW TO
In this tutorial we look at how dynamic DNS works and how to set it up on a home router.
However small companies, and home networks don’t normally have their own DNS server so why would they need Dynamic DNS ? Dynamic DNS keeps DNS records automatically up to date when an IP address changes.ĭynamic DNS is used in large networks that host internal services, and use their own internal DNS and DHCP servers.
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