How to Change the IP Range for the ICS DHCP Service

This article describes how to change the Internet Protocol (IP) range for the Internet Connection Sharing (ICS) Dynamic Host Configuration Protocol (DHCP) service.

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base: To change the IP range of the DHCP service on the ICS Host, follow these steps:

1. Use Registry Editor to modify the data value of the IntranetInfo value in the following registry key:
   Hkey_Local_Machine\System\CurrentControlSet\Services\ICSharing\Settings\General
   The first number listed is the IP address of the internal IP address of the ICS host. The second number is the subnet IP address separated by a comma. Enter the first IP address of the new range followed by the subnet mask, separated by a comma. (For example, 169.254.0.1,255.255.0.0.).
2. Modify the data value of the Start value in the following registry key:
   Hkey_Local_Machine\System\CurrentControlSet\Services\ICSharing\Addressing\Settings
   Change the value to the second address of the selected IP range. This address cannot be the same or a lower value than the IP address used for the IntranetInfo key.
3. Modify the data value for the Stop value in the same registry key. Enter the last the IP address of the selected IP range.
4. Click Start point to Settings, click Control Panel, and then double-click Network.
5. Double-click TCP/IP (Home)->Network Adapter.
6. On the IP Address tab, enter the value you specified for the IntranetInfo value in the Specify an IP Address box. In the Subnet Mask box, enter the value you used for the subnet mask in the registry.
7. Click OK, and then click OK. When you are prompted to restart your computer, do so.
8. After the computer restarts, wait one minute.
9. On each client, click Start, click Run, type winipcfg, and then click OK.
10. Click Release All, and then click Renew All.

Although altering these specific ICS settings is possible in the manner described in this article, Microsoft Product Support Services will not assist with customizing IP settings for ICS beyond the default configuration.