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Web Mountain Technologies Page 24
Dynamic DNS
One problem that exists with accessing a device at a home is the possibility that
the ISP has changed your WAN IP Address. Depending upon the ISP, this IP
address might stay the same for months, or it might change every few days. If
the IP address does change regularly, it becomes a hassle, as someone has to
access a browser local to the RUC, use some mechanism such as
www.ipchicken.com to determine the current WAN IP Address, and provide this
to the party trying to do remote access. Obviously, this becomes a major
problem if no one is home.
One way to solve this issue is to use a Dynamic DNS service. With this service, a
small client application runs on the remote device and regularly checks in with
the service’s servers located on the Internet to constantly keep this IP address
updated. The DDNS server will constantly match the WAN IP address with a
consistent URL, such as
www.ruc1.com . So, now the party trying to do remote
access doesn’t type in the WAN IP address as shown before, but types in
www.ruc1.com . The DDNS server knows what WAN IP address this corresponds
to and routes the remote user to this particular RUC.
In order to use this service, you must first create an account with one of the
DDNS service providers. The RUC lists several providers in the drop down box.
DYNDNS is one of the larger ones. When you create the account, remember
your user name, your password, and the URL you use to access the account
(Host). Enter this information into this screen and then click on Set DDNS
Configuration.