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If a dynamic update client is multihomed (has more than one adapter and associated IP address), by default it registers DNS A record(s) containing the first IP address on each network connection. If you do not want the dynamic update client to register all of its IP addresses, you can configure it to not register A and PTR records containing the IP address(es) of one or more network connections. For more information about multihoming, see Configuring TCP/IP on the companion CD. To prevent the computer from registering A and PTR records containing the IP address on a specific network connection 1. In Control Panel, select Network and Internet Connections.
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2. In the Network and Internet Connections sheet, select Network Connections. 3. In Network Connections, right-click the local area network connection that you want to change and then click Properties. 4. Select Internet Protocol (TCP/IP), click Properties, click Advanced, and then select the DNS tab. 5. Clear the Register this connection s address in DNS check box. The dynamic update client does not register all IP addresses with all DNS servers. For example, Figure 24-13 shows a multihomed computer, client1.noam.reskit.com, which is connected to both the Internet and the corporate intranet. Client1 is connected to the intranet by adapter A, a DHCP adapter with the IP address 172.16.8.7. Client1 is also connected to the Internet by adapter B, a remote access adapter with the IP address 131.107.0.16. Client1 resolves intranet names by using a name server on the intranet, NoamDC1, and resolves Internet names by using a name server on the Internet, ISPNameServer.
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NoamDC1 client1.noam.reskit.com mapped to 172.16.8.7
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ISPNameServer client1.noam.reskit.com mapped to 131.107.0.16
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Adapter A DHCP adapter 172.16.8.7
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Adapter B RAS adapter 131.107.0.16
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Figure 24-13
Dynamic update for multihomed clients
Note that although Client1 is connected to both networks, the IP address 172.16.8.7 is reachable only through adapter A, and the IP address 131.107.99.1 is reachable only through adapter B. Therefore, when the dynamic update client registers the IP addresses for Client1, it does not register both IP addresses with both name servers. Instead, it registers the name-toIP address mapping for adapter A with NoamDC1 and the name-to-IP address mapping for adapter B with ISPNameServer.
Disabling Dynamic Update
Dynamic update is configured on Windows XPProfessional clients by default. Dynamic update can be disabled for all network interfaces on the computer by adding the registry entry DisableDynamicUpdate with a value of 1 (REG_DWORD data type) to the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\ Parameters
24:
Configuring IP Addressing and Name Resolution
Caution
Do not edit the registry unless you have no alternative. The Registry Editor bypasses standard safeguards, allowing settings that can damage your system or even require you to reinstall Windows. If you must edit the registry, back it up first.
To disable dynamic update for the network interface card with the device ID of interface, add the entry DisableDynamicUpdate with a value of 1 (REG_DWORD data type) to the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\ Parameters\Interfaces\interface-name If this entry exists in both the Interfaces subkey and the specific interface-name subkey, the more global of the two subkeys takes precedence.
Editing Hosts Files
For networks without access to a DNS name server, the creation of a local host table file, called a Hosts file, can provide host name resolution for applications and services. This file can also be used in an environment where name servers are available but not all hosts are registered. For example, a Hosts file can be used for a server that is not available for general use and is to be accessed only by a limited number of clients. This file must be manually created and updated as host names and addresses change. TCP/IP in Windows XP Professional can be configured to search Hosts for mappings of remote host names to IP addresses. The Hosts file format is the same as the format for host tables in the 4.3 Berkeley Software Distribution (BSD) UNIX /etc/Hosts file. For example, the entry for a computer with an address of 192.176.73.6 and a host name of client1.reskit.com looks like this:
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