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Manual Chapter: Redirecting DNS Queries Using a CNAME Pool
Manual Chapter
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Redirecting DNS Queries Using a CNAME Pool

Overview: Redirecting DNS queries using 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 pool configured with a CNAME type to the wide IP with an A record type to redirect the requests 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 CNAME pool with members specifying the canonical name, BIG-IP® DNS responds to DNS name resolution requests for A or CNAME name record type queries with these names if this pool is added to the said wide IP.

Task summary

Perform these tasks to redirect a DNS request using a wide IP, which includes a pool that is configured with a CNAME type.

Creating a CNAME pool

Create a CNAME pool to which the system can load balance DNS queries. For example, you can name the pool competitor_redirect and use a pool member name of competitor.siterequest.com.
  1. On the Main tab, click DNS > GSLB > Pools .
    The Pool List screen opens.
  2. Click Create.
  3. In the Name field, 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 Type list, select the CNAME type.
  5. In the Members area, for the Member List setting, from the Wide IP list, select either a pool member (A or AAAA type) or a static target, and then click Add.
  6. Click Finished.

Creating a wide IP with a CNAME pool

Ensure that a pool configured with a CNAME type exists in the BIG-IP® configuration.
Create a wide IP that includes a pool configured with a CNAME to redirect DNS queries from a web site, to a different web site.
  1. On the Main tab, click DNS > GSLB > Wide IPs .
    The Wide IP List screen opens.
  2. Click Create.
  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 Type list, select a record type to serve from the required DNS query types.
    Note: If you want the BIG-IP®DNS to respond to both A and CNAME record type requests, you must configure two wide IPs. One wide IP of type A with a CNAME pool type, and a second wide IP of type CNAME with a CNAME pool type. At a minimum, an A record type wide IP should be configured with a CNAME pool.
  5. In the Pools area, for the Pool List setting, from the Pool list, select the name of the CNAME pool, and then click Add.
  6. Click Finished.

Viewing statistics for wide IP CNAME resolutions

Ensure that a wide IP that includes a pool configured with a CNAME exists in the BIG-IP® configuration.
You can view the number of DNS queries that BIG-IP® DNS (formerly GTM™) resolved using a CNAME record.
  1. On the Main tab, click Statistics > Module Statistics > DNS > GSLB .
    The Global Traffic statistics screen opens.
  2. From the Statistics Type list, select Wide IPs.
    Information displays about the cumulative number of DNS name resolution requests processed by the wide IP, and the number of requests load balanced using specific methods.

Implementation result

You now have an implementation in which BIG-IP® DNS resolves a DNS query for a wide IP to a CNAME.

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