The SmartConnect service subnet is an IP address pool setting. You can specify any subnet that has been configured with a SmartConnect service IP address and references the same groupnet as the pool. You must have at least one subnet configured with a SmartConnect service IP address in order to handle client DNS requests. You can configure only one service IP address per subnet.
A SmartConnect service IP address should be used exclusively for answering DNS requests and cannot be an IP address that is in any pool's IP address range. Client connections through the SmartConnect service IP address result in unexpected behavior or disconnection.
Once a SmartConnect service subnet has been associated with an IP address pool, the service subnet distributes incoming DNS requests according to the pool's connection balancing policy. If a pool does not have a designated service subnet, incoming DNS requests are answered by the subnet that contains the pool, provided that the subnet is configured with a SmartConnect service IP address. Otherwise, the DNS requests are excluded.