Common Network Administration Tasks That Use DNS Service

The following sections illustrate some common network administration tasks that require DNS service.

Setting Up MX Records

If you plan to provide mail service on your network, you must set up DNS so that incoming mail is sent to the appropriate mail host on your network. When you set up mail service, you define a series of hosts, known as mail exchangers or MX hosts, with different priorities. The host with the highest priority gets the mail first. If that host is unavailable, the host with the next highest priority gets the mail, and so on.

For example, let’s say the mail server’s host name is “reliable” in the “example.com” domain. Without an MX record, the users’ mail addresses would include the name of your mail server computer, like this:

user-name@reliable.example.com

If you want to change the mail server or redirect mail, you must notify potential senders of a new address for your users. Or, you can create an MX record for each domain that you want handled by your mail server and direct the mail to the correct computer.

When you set up an MX record, you should include a list of all possible computers that can receive mail for a domain. That way, if the server is busy or down, mail is sent to another computer. Each computer on the list is assigned a priority number. The one with the lowest number is tried first. If that computer isn’t available, the computer with the next lowest number is tried, and so on. When a computer is available, it holds the mail and sends it to the main mail server when the main server becomes available, and then the server delivers the mail. A sample list might look like this:

example.com

10 reliable.example.com

20our-backup.example.com

30last-resort.example.com

MX records are used for outgoing mail, too. When your mail server sends mail, it looks at the MX records to see whether the destination is local or somewhere else on the Internet. Then the same process happens in reverse. If the main server at the destination is not available, your mail server tries every available computer on that destination’s MX record list, until it finds one that will accept the mail.

Note: If you don’t enter the MX information into your DNS server correctly, mail won’t work.

Chapter 2 DNS Service

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Apple 034-2351_Cvr manual Common Network Administration Tasks That Use DNS Service, Setting Up MX Records, Example.com
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