Consult everybody:
Two network CARDS on the server: A, B
A default route card after the network
B card pick up Intranet
Rev. DNS service on B card, accept the network DNS query request

The expected behavior is like this:
1, when B receives a DNS query request
2, according to the configuration file to find the root of local records server address: X.X.X.X
3, launched an query requests the X.X.X.X
4, network and X.X.X.X is unknown, A nic walking through the default query routing by

Actual behavior is:
1 B received a DNS query request
2, didn't initiate any superior query requests, leading to parse failure

Where is my understanding is wrong? Need to how to deal with this problem?
(note:
1, configuration for the local master analytic domain, which can be resolved properly to the designated IP
2, although has nothing to do and nic forward, but also opened up forward, but does not open, the result is as analytical failure;
)