>>On the other hand, I detected the Firewall-1 denies the replies packets
to
>>the server, I mean, the DNS server can not query other servers outside
the
>>network., because the Firewall drops the replies, although the option
>>"Accept UDP Replies" in the global Policies, is activated.

The accept UDP replies applies to response packets for firewall not the DNS
server behind the firewall.
The rules should be explicitly defined.
Any Dns_server domain-udp Accept
domain-tcp
the above rule will enable internet to query your domain's DNS server
behind your firewall.
Dns_server Any domain-udp Accept
domain-tcp
the above rule will enable your DNS server to query external DNS servers in
Internet.
Restrict zone transfers in DNS servers , rather than closing port
domain-tcp.
regards,
U.SivaKumar,
HCL Infosystems Limited.

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