Before You Set Up DNS Service, DNS and Bind

Before You Set Up DNS Service

This section contains information you should consider before setting up DNS on your network. The issues involved with DNS administration are complex and numerous. You should only set up DNS service on your network if you’re an experienced DNS administrator.

You should consider creating a mail account called “hostmaster” that receives mail and delivers it to the person that runs the DNS server at your site. This allows users and other DNS administrators to contact you regarding DNS problems.

DNS and BIND

You should have a thorough understanding of DNS before you attempt to set up your own DNS server. A good source of information about DNS is DNS and BIND, 4th edition, by Paul Albitz and Cricket Liu (O’Reilly and Associates, 2001).

Note: Apple can help you locate a network consultant to implement your DNS service. You can contact Apple Professional Services and Apple Consultants Network on the web at www.apple.com/services/ or www.apple.com/consultants.

Setting Up Multiple Name Servers

You should set up at least one primary and one secondary name server. That way, if the primary name server unexpectedly shuts down, the secondary name server can continue to provide service to your users. A secondary server gets its information from the primary server by periodically copying all the domain information from the primary server.

Once a name server learns a name/address pair of a host in another domain (outside the domain it serves), the information is cached, which ensures that IP addresses for recently resolved names are stored for later use. DNS information is usually cached on your name server for a set time, referred to as a time-to-live(TTL) value. When the TTL for a domain name/IP address pair has expired, the entry is deleted from the name server’s cache and your server will request the information again as needed.

Setting Up DNS Service for the First Time

If you’re using an external DNS name server and you entered its IP address in the Setup Assistant, you don’t need to do anything else. If you’re setting up your own DNS server, follow the steps in this section.

Step 1: Register your domain name

Domain name registration is managed by a central organization, the Internet Assigned Numbers Authority (IANA). IANA registration makes sure domain names are unique across the Internet. (See www.iana.org for more information.) If you don’t register your domain name, your network won’t be able to communicate over the Internet.

Chapter 2 DNS Service

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Apple 034-2351_Cvr manual Before You Set Up DNS Service, Setting Up DNS Service for the First Time

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