•.com is the TLD
•mydomain is the domain (usually noted as mydomain.com since the domain is specific to the TLD)
•car54 is the subdomain or server name associated with the device, computer, or modem registered with mydomain.com
car54.mydomain.com.ca
This would be the same as above, but with the addition of the country code. In this example, the country code (.ca) is for Canada.
A URL (Universal Resource Locator) is different from a domain name in that it also indicates information on the proto‐ col used by a web browser to contact that address, such as http://www.sierrawireless.com. www.sierrawireless.com is a fully qualified domain name, but the http://, the protocol iden‐ tifier, is what makes the whole thing a URL.
Dynamic Names
When an IP address is not expected to change, the DNS server can indicate to all queries that the address can be cached and not looked up for a long period of time. Dynamic DNS servers, conversely, have a short caching period for the domain information to prevent other Internet sites or queries from using the old information. Since the IP address of a modem with a dynamic account can change frequently, if the old information was used (such as with a DNS server which indicates the address can be cached for a long period of time) when the IP address changed, the domain would no longer point to the new and correct IP address of the modem.
If your modem is configured for Dynamic IP, when it first connects to the Internet, it sends a IP change notification to IP Manager. IP Manger will acknowledge the change and update the Dynamic DNS server. The new IP address will then be the address for your modem’s configured name.
Once your modem’s IP address has been updated in IP Manager, it can be contacted via name. If the IP address is needed, you can use the domain name to determine the IP address.
Note: The fully qualified domain name of your modem will be a subdomain of the domain used by the IP Manager server.
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