DNS: Domain Name System
The Domain Name System (DNS) turns domain names into IP addresses, which browsers use to load internet pages. Every device connected to the internet has its own IP address, which is used by other devices to locate the device. DNS servers make it possible for people to input normal words into their browsers, such as google.com, without having to keep track of the IP address for every website.
DNS Server:
A DNS server is a computer with a database containing the public IP addresses associated with the names of the websites an IP address brings a user to. DNS acts like a phonebook for the internet. Whenever people type domain names, website, into the address bar of web browsers, the DNS finds the right IP address. The site’s IP address is what directs the device to go to the correct place to access the site’s data.
Once the DNS server finds the correct IP address, browsers take the address and use it to send data to content delivery network (CDN) edge servers or origin servers. Once this is done, the information on the website can be accessed by the user. The DNS server starts the process by finding the corresponding IP address for a website’s uniform resource locator (URL).
In Firewall: The DNS server is configured at the time of installation. You can add additional DNS servers to which the device can connect for name resolution. If multiple DNS are defined, they are queried in the order as they are entered.
Static DNS: Firewall supports static DNS host entry where the device acts as a DNS Name Server that provides the requesting client with A records to resolve their requested URL.
You can manually add static DNS host entries for a particular domain name. Firewall checks DNS host entries for the requested domain name. If the domain name requested by the user matches the DNS host entry then the device performs DNS resolution and replies to the client with the IP address found in the static DNS host entry. DNS requests do not need to be redirected to the Local/Authoritative DNS server any longer. This facilitates faster data transfer and avoids multiple DNS resolution cycles for every client request. You can also add multiple IP addresses for a single website hosted behind Firewall.