Network Address Translation (Nat); Domain Name System (Dns) - ABB FBVi-2U4-4T User Manual

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NETWORK ADDRESS TRANSLATION (NAT)

Network Address Translation

a single public IP address. This is necessary because the number of

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 =

Subject to change without notice

WWW.CYLON.COM

is a function of a router or firewall, which maps multiple local IP addresses to

and secondary =

8.8.8.8

4.4.4.4

IP Networking

FBVi-2U4-4T |

IPv4

addresses is finite.

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