Microsoft KB Archive/169140

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Using DHCP to Assign IP Addresses to Secondary Networks

Article ID: 169140

Article Last Modified on 11/1/2006


  • Microsoft Windows NT Server 4.0 Standard Edition

This article was previously published under Q169140


This article describes how to use Dynamic Host Configuration Protocol (DHCP) to lease IP addresses for routers configured to use secondary IP addressing.


Some routers can be configured with primary and secondary addresses that allows one port on a router to listen to multiple (logical) subnets.

Windows NT 4.0 Service Pack 2 and later introduced Superscoping support for DHCP. This allows a DHCP server with one network interface card to assign leases for multiple logical subnets.

To setup Superscopes in DHCP Manager, perform the following steps:

  1. Create a new scope in DHCP Manager that corresponds with the primary subnet on the router.
  2. Create the Superscopes that will be a part of the secondary address(es) configured on the router.
  3. Use the DHCP Manager to define the Superscope to include all the subnets.

For complete steps on how to setup DHCP Superscoping, please refer to the following article in the Microsoft Knowledge Base:

161571 Using DHCP Superscopes to Serve Multiple Logical Subnets

Additional query words: secondary router nt4sp2 ntdhcp

Keywords: kbinfo kbnetwork KB169140