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Product Manuals and Release notes
You can configure BIG-IP® DNS to return DNS NoError responses that include a TTL. With this configuration, local DNS servers can cache a negative response. Negative caching reduces both the response time for negative DNS responses and the number of messages that must be sent between resolvers and local DNS servers.
A start of authority SOA record contains a TTL by which a local DNS server can be configured to cache a DNS NoError response to an IPv6 query.
You can configure DNS to provide a negative caching TTL for a domain name by performing these specific tasks.
You now have an implementation in which BIG-IP® DNS returns a TTL in a DNS NoError response for a web site represented by a wide IP in the DNS configuration.