Forum Discussion
samstep
May 01, 2015Cirrocumulus
It is the "DNS Express" or the "DNS Services" module (depending on license).
"DNS Express is an engine that provides the ability for the BIG-IP system to act as a high-speed, authoritative DNS server. With DNS Express configured, the BIG-IP system can answer DNS queries for a DNS zone and respond to zone transfer requests from specified DNS nameservers (clients). Additionally, zone transfer communications can be secured with TSIG keys. "
Hope this helps,
Sam