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Change IP Address Tool

You can use the Change IP Address Tool to change the IP address used by the server to access the local network and update network services that use this IP address as specified in the section, "Changes made by the tool."

Important

  • Network services for client computers may not function correctly until the client computer configuration is updated.
    To update client computer configurations
    If client computers are assigned IP addresses by the DHCP service on your server, you can manually update this information by renewing the IP address at each client computer. To do so, use the ipconfig command. For information about these commands, click Start, click Help and Support, and then search for "IPconfig."
    If you have an existing DHCP device on your local network, it must be configured with the necessary settings. For more information about configuring an existing DHCP device, see Appendix C, "Network Configuration Settings," of Getting Started.
    If client computers use static IP addresses, you must manually update the network settings for the network adapter of each client computer. For more information, click Start, click Help and Support, and then search for "manually configuring TCP/IP."
  • When you change the IP address of the local network adapter, remote client computers will be unable to access network resources unless you change the range used for assigning IP addresses to remote client computers. For more information, click Start, click Help and Support, and then search for "configure remote access."

 

Item Description

Current IP address

Displays the IP address currently used by the server to access the local network.

New IP address

Type the IP address that you want the server to use when accessing the local network.

It is recommended that you use a private IP address for your network adapter used to access the local network. For more information about specifying an IP address, see the "Public vs. Private IP Addressing" section in Appendix B, "Understanding Your Network," of Getting Started.

New subnet mask

Type the subnet mask associated with the new IP address.

Changes made by the tool

When you run the Change IP Address Tool, the following changes are made:

  • The IP address and subnet mask of the network adapter used to access the local network are changed.
  • The DNS server address for the external network adapter, which is set to the IP address of your local network adapter, is updated.
  • The DNS server address and WINS server address for the TCP/IP properties of the local network adapter are set to the new IP address.
  • Network services that are dependent on the IP address of the local network adapter are updated.
    Network services configured by the Change IP Address Tool
    • DHCP service. If you are using the DHCP server service provided with Windows Small Business Server, it is also updated by the tool. If the new IP address is within the address range of the existing scope of IP addresses, the tool will add a new exclusion to the existing scope. The router option (003) is updated to the new IP address of the local network adapter. If the new IP address is not within the address range of the existing scope, the tool creates a new scope based on the new IP address.
      Notes

If your server has only one network adapter and you have a broadband connection that uses a router to connect to the Internet, the router option is not updated as this address is set to the IP address of the router itself.

If you are using an existing DHCP server service on the local network, you must ensure that the new IP address of your server's local network adapter is excluded from the range of IP addresses assigned out by the device.

  • DNS server. The tool updates the DNS Server service to listen to the IP address of the local network adapter. If the reverse lookup zone no longer matches the new IP address, it is deleted and a new reverse lookup zone is created.
  • Firewall service. If your server uses one network adapter to access the local network and another network adapter to access the Internet, the firewall service settings are updated.
    If the Routing and Remote Access service is running, the tool updates the IP address for the inbound packet filters on the network adapter used to access the ISP. The routing table for the Routing and Remote Access service is automatically updated as well.
    If Internet Security and Acceleration (ISA) Server 2000 is running, a local address table (LAT) is created based on the new IP address. If you use a dial-up connection to connect to the Internet, the tool will also update the client address set for ISA Server.
  • Exchange server. If Exchange server is installed, the relay restrictions are updated to the new IP address.
  • WINS server. The service is restarted to ensure that the new IP address is used by the service.
  • Internet Information Services (IIS). The permissions for the default Web Site and virtual directories are set to the new IP address. Additionally, if Internet Security and Acceleration (ISA) Server 2000 is installed as well, the following changes are made:

Configures http.sys driver to only bind to the local network adapter and the loopback adapter. By doing this, IIS will only listen to Web requests from the local network adapter. This allows ISA Server to monitor incoming Web requests from the Internet.

Disables socket pooling, which enables ISA Server to use port 80, so ISA Server can monitor incoming Web requests.

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