Dynamic names, Car54.mydomain.com car54.mydomain.com.ca – Sierra Wireless RAVEN 20070914 User Manual
Page 72
IP Manager
Rev 3.0B Feb.08
67
need to be registered with ICANN or any other registry. It
is the responsibility of a domain to keep track of its own
subs.
car54.mydomain.com
•
.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.
Tip: A URL (Universal Resource Locator) is different from a domain
name in that it also indicates information on the protocol 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 identifier, 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 infor‐
mation 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 Raven 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.