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Product Manuals and Release notes
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.
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).
Perform these tasks to redirect a DNS query using a wide IP with a CNAME pool.
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.