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6.3 Dynamic DNS
The Dynamic DNS service allows you to alias a dynamic IP address to a static
host name, allowing your computer to be more easily accessible from various
locations on the Internet. Typically, when you connect to the Internet, your ser-
vice provider assigns an unused IP address from a pool of IP addresses, and
this address is used only for the duration of a specific connection. Dynam-
ically assigning addresses extends the usable pool of available IP addresses,
whilst maintaining a constant domain name. Each time the IP address pro-
vided by your ISP changes, the DNS database will change accordingly to re-
flect the change in IP address. In this way, even though a domain name's IP
address will change often, your domain name will still be accessible.
To be able to use the Dynamic DNS feature you must open a DDNS account,
free of charge, at
http://www.dyndns.org/account/create.html
When applying for an account, you will need to specify a user name and pass-
word. Please have them readily available when customizing GlobeSurfer 3G's
DDNS support. For more information regarding Dynamic DNS, please refer to
http://www.dyndns.org.
6.3.1 Using Dynamic DNS
1. Click Dynamic DNS on the Advanced screen of the Management Console.
The Dynamic DNS table will appear (see figure 6.5).
2. Specify the Dynamic DNS parameters:
Connection to Update Select the connection to which you would like to
couple the Dynamic DNS service.
Offline Enable the Dyndns offline feature by selecting this check box.
This feature is available only to users who have purchased some
type of upgrade credit from Dyndns.org. Please note that changing
the redirection URL can only be perfomed via the Dyndns web site.
Username Enter your Dyndns user name.
Password Enter your Dyndns password.
Hostname Enter a your full Dyndns domain.
Wildcard Select the Wildcard checkbox if you want anything-here.yourhost.dyndns.org
to work (i.e. to make things like www.yourhost.dyndns.org work).
Mail Exchanger Enter your mail exchange server address, to redirect all
e-mails arriving at your Dyndns address to your mail server.
Backup MX Select this check box to designate the mail exchange server
to be a backup server.
Figure 6.5: Dynamic DNS Settings
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