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For those unfamiliar with DDNS, it works like this: Many SOHO network devices (Linksys, Netgear, etc.) ship with support for several popular DDNS providers. This article describes the configuration of DDNS as offered by Dyn DNS.com, but it can be adapted to suit any provider which supports updates via HTTP requests.

Configuring my Cisco 1811 demarcation router to work with Dyn DNS was pretty straightforward.

Part I starts with a solid overview of troubleshooting tools and methodologies.

By following the presentation of troubleshooting techniques and tips, you can observe and analyze problems through the eyes of an experienced Cisco TAC or High-Touch Technical Support (HTTS) engineer or determine how to escalate your case to a TAC/HTTS engineer.

One of the challenges in getting the community lab up and running was not having a reliable static IP address for public reachability (the lab is connected to the Internet via a home cable broadband connection for the time being).

Rather than shell out an absurd amount of cash for a "business" plan with a static IP, I opted to make use of Dynamic DNS (DDNS).

(This example assumes DHCP has already been configured on the ISP-facing interface.) The first step is to define a DDNS update method: Router(config)# ip ddns update method Dyn DNS Router(DDNS-update-method)# ?

Dynamic DNS update method configuration commands: DDNS IETF standardized Dynamic DNS update HTTP Dynamic DNS update via HTTP based protocols default Set a command to its defaults exit Exit from DNS dynamic update method configuration mode internal Update internal IOS name cache interval Specify interval between DNS updates no Negate a command or set its defaults in the example above is an arbitrary unique name; this can be anything you want.

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