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Product Manuals and Release notes
You can configure BIG-IP GTM to return IPv6 DNS NoError responses that include a TTL. This allows local DNS servers to cache the 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 that allows a local DNS server to cache a DNS NoError response to an IPv6 query.
You can configure GTM to provide a negative caching TTL for a domain name by performing these specific tasks.