NETWORK ADDRESS TRANSLATION (NAT)
Network Address Translation is a function of a router or firewall, which maps multiple local IP addresses to a
single public IP address. This is necessary because the number of IPv4 addresses is finite.
DOMAIN NAME SYSTEM (DNS)
When communicating on the wider Internet, it can be difficult to remember the numeric IP address for each
device with which you want to communicate. The Domain Name System (DNS) was created to allow internet
users to use a text-based Uniform Resource Locator (URL) with meaningful values such as “www.cylon.com”
to connect to a site or device without having to know the server’s IP address. The DNS finds the URL in its
distributed database and passes the corresponding numeric IP address to the requesting device. If a device’s
IP address changes, the DNS server can be updated with its new IP address, ensuring that other networked
devices can still find this device from its URL.
When setting a devices IP parameter manually, between one and three DNS IP address are usually provided.
The second and third addresses are used if the first DNS becomes unavailable.
If you do not know the address of your DNS server(s), you can use publicly available DNS server addresses for
example primary =
8.8.8.8
and secondary =
4.4.4.4
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