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Chapter 12

12 - 10

Converting from rotary or round robin DNS

If your network is currently configured to use rotary DNS, your node

configuration may not need modification. However, you need to modify

your DNS zone tables to map to a single IP address instead of to multiple IP

addresses.

For example, if you had two Web sites with domain names of

www.SiteOne.com and www.SiteTwo.com, and used rotary DNS to cycle

between two servers for each Web site, your zone table might look like the

one in Figure 12.5.

In the BIG-IP configuration, the IP address of each individual node used in

the original zone table becomes hidden from the Internet. We recommend

that you use the Internet reserved address range as specified by RFC 1918

for your nodes. In place of multiple addresses, simply use a single virtual

server associated with your site's domain name.

Using the above example, the DNS zone table might look like the zone table

shown in Figure 12.6.

Configuring email

Another optional feature you can set up when you configure the BIG-IP is

email. You can configure the BIG-IP to send email notifications to you, or

to other administrators. The BIG-IP uses Sendmail as its mail transfer agent.

The BIG-IP includes a sample Sendmail configuration file that you can use

to start with, but you will have to customize the Sendmail setup for your

network environment before you can use it.

Before you begin setting up Sendmail, you may need to look up the name of

the mail exchanger for your domain. If you already know the name of the

mail exchanger, continue with the following section, Setting up Sendmail.

www.SiteOne.com IN A 192.168.1.1

IN A 192.168.1.2

www.SiteTwo.com IN A 192.168.1.3

IN A 192.168.1.4

Figure 12.5 Sample zone table with two Web sites and four servers

www.SiteOne.com IN A 192.168.100.231

www.SiteTwo.com IN A 192.168.100.232

Figure 12.6 Sample zone table with two Web sites and two servers.

1 2 ... 379 380 381 382 383 384 385 386 387 388 389 ... 425 426

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