While resolving Conditional forwarder domain address, DNS is forwarding the query to Forwarder where internet DNS servers are set for resolving internet queries.
Instead of Internal IP resolution from conditional forwarder Internet IP is being resolved.
Below is the setup.
There is a single forest with root domain name as Forestdomain.com and tree with nameTreedomain.in
forestdomain.com conditional forwarder is created in DNS Server ofTreedomain.in
mail.forestdomain.com is being looked up from DNS server of Treedomain.in .
Instead of Internal IP resolution from forestdomain.com conditional forwarder Internet IP of mail.forestdomain.com is being resolved.
In forestdomain.com DNS record mail.forestdomain.com
is delegated with F5 address as name server.
The resolution through Internet ISP DNS is intermittent and abrupt.
Please help on this.