Public DNS with NAT IP

[guy cipher]

Hi,
I'm setuping the BIND 9.3 on Solaris 9 server having private IP address. The
Firewall is doing mapping (NATing) the public IP to the private IP address.
Let's say 198.16.1.4 -> 172.31.31.99.

The current DNS server is working fine having public IP is working fine.
When I copied all the configuration from current DNS server to another
server having private IP (172.31.31.99).  The configuration is same only the
server IP is private.  The DNS server is not resolving properly the queries
for non-authrorartive server, but it does resolves the all A records defined
in the DNS configuration.

When I run 'nslookup' it generates meesage "can't find server name for
address 172.31.32.5". It resolves the queries from "127.0.0.1" loopback
address. Sometimes it generates "No address (A) records available.

My questions are below:

Is there any specific configuraton for bind when configure public DNS having
private IP and NAT on firewall.
Should the A record of the DNS server will reflect the "private IP" or
oublic IP.


Please help me if somebody have configured the bind in same environment.

Thanks in advance

Rehan