IPv4 Communication Fundamentals
22 ECLYPSE User Guide
Domain Name System (DNS)
When you want to connect to another computer or service on the Internet (to a Website for
example), rarely would you want to use the IP address to make the connection as it would
be a pain to remember the numeric IP address for each and every site you want to visit. The
Domain Name System (DNS) was created to allow internet users to take advantage of a
meaningful Uniform Resource Locator (URL) such as http://www.distech-controls.com/ to
connect to an IP address without having to know the server’s or computer’s numerical IP
address. The DNS does this by looking up the URL and providing the numeric IP address to
the requesting computer. Should the IP address of a computer/server be changed, the DNS
server can be updated with its new IP address, thereby ensuring that other networked
computers can still find this computer/server through its URL.
Set the DNS IP address of the Domain Name System (DNS) servers in routers and in IP
controllers that have manually-configured IP parameters. Between one and three DNS IP
address is usually provided by the Internet Service Provider (ISP). The second and third
DNS addresses are for failover should the first DNS become unavailable.
If you do not know the address of your DNS server(s), try the following publicly-available
DNS server addresses: primary = 8.8.8.8 and secondary = 4.4.4.4
Some ECLYPSE controller services use DNS to resolve Web addresses thereby allowing
the service to operate. See ECLYPSE Services that Require Internet Connectivity on page
30.
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