Windows Server 2003 Configure DNS Forwarding

Sun, 23 Nov 2008 21:56:31 EST

Configure DNS Forwarding: We discussed the concept of forwarding briefly earlier. When a DNS server is configured as a forwarder, it attempts to reconcile the resolution request from its cache and zone files. If it fails to do so, it then forwards the request to designated name server by sending a recursive query to it. The forwarder then does the iterative queries necessary to resolve the request, and reports the result to the local DNS server. Forwarding can be configured several ways.

The forwarding tab from the server properties. The forwarding tab allows you to select to forward all requests not in the namespace for that server to another selected name server. The screenshot shows "All Other Domains" being forwarded to 192.168.12.2, another internal name server. This allows the tomw2k3 machine to service requests for its domain and hand off all the rest of the work to the other name server at the specified address or addresses. The check box at the bottom of the screen lets you configure your server into an exclusive forwarder. If the box is checked and a name resolution request is returned from the forwarding partner unresolved, this

DNS server would return a host name not found. If the check box is not checked (as shown here, which is the default), the DNS server will attempt to resolve the request if it is not resolved by the forwarder. This is known as nonexclusive mode. If several domains are entered here, each can have its own separate set of forwarding partners. This allows you to configure specific domain requests directly to the name server that is authoritative for that namespace. Typically you would use this for a close partner, or possibly a domain that generates a high level of requests from your namespace.

Pop Quiz Questions:
1. You need to troubleshoot a server to see if it can receive packet requests. What utility can you use for this purpose?
2. What is the Start of Authority record used for in DNS?
3. What should you do if you need a server to forward any client requests to another DNS Server?
4. Which zone updated directly on the DNS Server?
5. What is DNS Forwarding used for on a Windows Server 2003?

Pop Quiz Answers:
1. Send ICMP echo requests to verify connectivity with the Ping command at the prompt.
2. The Start of Authority or SOA record is the first record in any zone file. It is used to identify the primary DNS name server for the zone. It also contains replication information for the zone, such as serial number, refresh interval, retry interval and expiration values (Time to Live) for the zone
3. Setup DNS on the server to be a caching only server.
4. The Primary Zone can be directly updated from the server.
5. Forwarding on a DNS Server will attempt to reconcile the resolution request from its cache and zone files. If this attempt fails the request is forwarded to another designated name server by sending a recursive query to it and the forwarder will then send iterative queries necessary so the request can be resolved. Once the request is resolved the results are reported to the local DNS server

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Windows Server 2003 Configure DNS Forwarding