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Manual Chapter: Redirecting a DNS Query Using a Wide IP with a CNAME Pool
Manual Chapter
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Overview: Redirecting DNS queries using a wide IP with a CNAME pool

When you want to redirect DNS queries for a web site to a different web site, create a wide IP that represents the original web site and add a CNAME pool to the wide IP to redirect the queries to the new destination.

The executives at siterequest.com recently purchased a competitor. Site Request's administrator wants to redirect DNS queries for competitor.com to a rebranded web site named competitor.siterequest.com.

About CNAME records

A CNAME record specifies that a domain name is an alias of another domain. When you create a pool with a canonical name, BIG-IP GTM responds to DNS queries for the CNAME with the real fully qualified domain name (FQDN).

Task summary

Perform these tasks to redirect a DNS query using a wide IP with a CNAME pool.

Creating a pool using a CNAME

Create a pool to which the system can load balance DNS queries using a CNAME record, rather than pool members. For our example, name the pool competitor_redirect and use a CNAME of competitor.siterequest.com.
  1. On the Main tab, click Global Traffic > Pools. The Pools list screen opens.
  2. Click Create.
  3. Type a name for the pool. Names must begin with a letter, and can contain only letters, numbers, and the underscore (_) character.
    Important: The pool name is limited to 63 characters.
  4. From the Configuration list, select Advanced.
  5. In the CNAME field, type the canonical name of the zone to which you want BIG-IP GTM to send DNS queries.
    Tip: When you provide a canonical name, you do not add members to the pool, because the CNAME record always takes precedence over pool members. Additionally, a pool with a CNAME is not monitored for availability.
  6. Click Finished.

Creating a wide IP with a CNAME pool

Create a wide IP with a CNAME pool to redirect DNS queries for a web site to a different web site. For our example, create a wide IP named www.competitor.siterequest.com and add the CNAME pool competitor_redirect.
  1. On the Main tab, click Global Traffic > Wide IPs. The Wide IPs List screen opens.
  2. Click Create. The New Wide IP screen opens.
  3. In the Name field, type a name for the wide IP.
    Tip: You can use two different wildcard characters in the wide IP name: asterisk (*) to represent several characters and question mark (?) to represent a single character. This reduces the number of aliases you have to add to the configuration.
  4. From the Pool list, select the CNAME pool, and then click Add.
  5. Click Finished.

Implementation result

You now have an implementation in which when a client sends a DNS query for www.siterequest_competitor.com, the CNAME record redirects the LDNS to siterequest2.com. The LDNS performs an IP address lookup for siterequest2.com, and the BIG-IP GTM returns the correct IP address, which is forwarded to the client.

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