User manual

RLXIC-EV ♦ Intelligent Cellular Configuring your RLXIC-EV
RadioLinx® Intelligent Cellular Ethernet Gateway for Verizon User Manual
Page 74 of 104 ProSoft Technology, Inc.
March 10, 2010
 Domain name: This is the name registered with ICANN (Internet Corporation
for Assigned Names and Numbers) or the registry for the country of the
ccTLD (i.e. if a domain is part of the .ca TLD, it would be registered with the
Canadian domain registry). It is necessary to have a name registered before
it can be used.
 Sub-domain or server name: A domain name can have many sub-domain
or server names associated with it. Sub-domains need to be registered with
the domain, but do not 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 device 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 Locater) 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.prosoft-technology.com. www.prosoft-technology.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 information to prevent other Internet sites or queries from using the old
information. Since the IP address of a device 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 device.
If your RLXIC-EV is configured for Dynamic IP, when it first connects to the
Internet, it sends an IP change notification to IP Manager. IP Manager will
acknowledge the change and update the Dynamic DNS server. The new IP
address will then be the address for your device's configured name.
Once your device'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 RLXIC-EV will be a subdomain of the domain used
by the IP Manager server.