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I presume you have set up the same DNS instance to serve the same zone(s)? If so, be sure to set up zone transfers accordingly. The primary server 'master' should be allowed to transfer zone information to the secondary one 'slave'. You can also set-up DNS notify, so that the master knows whom to provide the zone info to should changes be made to the zone file. In this regard, you should also check that proper security settings are in place -- e.g. the master should be allowed to transfer zone information the slave's IP and vice versa. Hope this helps!
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I presume you have set up the same DNS instance to serve the same zone(s)? If so, be sure to set up zone transfers accordingly. The primary server 'master' should be allowed to transfer zone information to the secondary one 'slave'. You can also set-up DNS notify, so that the master knows whom to provide the zone info to should changes be made to the zone file. In this regard, you should also check that proper security settings are in place -- e.g. the master should be allowed to transfer zone information the slave's IP and vice versa. Hope this helps!

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TheLearnedOne,<br />
Br3ach's answer was incorrect. I suggest that this question is deleted.
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TheLearnedOne,
Br3ach's answer was incorrect. I suggest that this question is deleted.

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I have a Windows 2003 server box with MS DNS server running. The server is configured with two IP addresses and the DNS server is configured to listen on both. The problem is one IP responds to the queries correctly but the other does not (although it does reply, either the reply is empty or is different from what expected). The queries made at the second IP do not show up in the DNS log either. I can connect to other services running on the server on both IPs without problem.
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I have a Windows 2003 server box with MS DNS server running. The server is configured with two IP addresses and the DNS server is configured to listen on both. The problem is one IP responds to the queries correctly but the other does not (although it does reply, either the reply is empty or is different from what expected). The queries made at the second IP do not show up in the DNS log either. I can connect to other services running on the server on both IPs without problem.

DNS Server with two IPs

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.

Networking

The Dynamic Host Configuration Protocol (DHCP) is an auto configuration protocol used on IP networks and an extension of the Bootstrap Protocol. DHCP allows for computers to be configured automatically to communicate with each other over an IP network without the need for manual setup by a network administrator. The implementation of DHCP relies on a DHCP server to hand out network configuration information to DHCP-capable clients that request an IP address (and other information required or useful in communicating with other devices on an IP network). In addition to an IP address, common configuration information served over DHCP includes a default gateway, subnet mask and DNS sever(s).

DHCP

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.