6.4. Setting up DNS

DNS (Domain Name System) is responsible for translating Internet names (such as www.yourdomain.com) into IP addresses (such as 192.168.1.10). You can think of it like a telephone book for the Internet. Organizations publish DNS records to tell the rest of the world how to reach them.

The DNS is comprised of zones. A zone is either a domain name or an IP network for which a given server is authoritative. When you register a domain you define one or more nameservers -- these are the nameservers which are advertised to the Internet as having authoritative information for the domain.

DNS supports two types of zones: forward, which converts names to addresses, and reverse, which converts addresses to names.

Another core concept in DNS is a record. There are several different types of records, some of which are summarized in Table 6-1 below.

Table 6-1. DNS Record Types

AAddressPublishes names-to-addresses
PTRPoinTeRPublishes addresses-to-names
NSName ServerPublishes authoritative nameserver information.
MXMail eXchangerPublishes mail server information.

Under normal circumstances you will need to maintain your own DNS server if you are hosting any domains for e-mail or web. The rest of this section demonstrates creating forward and reverse DNS zones.

By the end of this section the reader will have created one forward and one reverse DNS zone.

6.4.1. Setting up a Forward DNS Zone

Log into the Guardian Digital WebTool, click the System Management icon, then click the DNS Management link in the Service Configuration section, then click the Create a New Master Zone link. You will then be presented with the screen shown in Figure 6-5.

Figure 6-5. New Master Zone Options

Fill out the information on this page using the suggestions below:

When done click the Create button. Your zone will be created and you will be taken back to the previous screen where you will see your new domain in the Existing DNS Zones section. Click on it to edit it.

For more information on adding Address, Name Alias, Name Server, and Mail Server records please refer to the EnGarde Secure Professional User Manual.

6.4.2. Setting up a Reverse DNS Zone

Setting up a reverse zone is just as easy as setting up a forward zone. Refer to Figure 6-5 and fill out the information on this page using the suggestions below.

When done click the Create button. Your zone will be created and you will be taken back to the previous screen where you will see your new domain in the Existing DNS Zones section. Click on it to edit it.

For more information on adding Address, Name Alias, Name Server, and Mail Server records please refer to the EnGarde Secure Professional User Manual.