How to Configure Additional DHCP Server Options

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How to Configure Additional DHCP Server Options

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Added by October 27, 2014

There are numerous additional options that can be configured in a DHCP server.  If you are configuring a Microsoft server, additional options include, but are not limited to, the following:

Routers (such as a default gateway for a client)
DNS servers (for name resolution)
DNS domain (domain name assigned to DHCP clients)
WINS node type (if using WINS)
WINS server (if using WINS)

Here are a few screen shots which demonstrate some of these additional option choices:

After a vanilla install of DHCP role, open the DHCP console:

001-How-to-configure-additional-DHCP-server-options

After right-clicking on Server Options:

002-How-to-configure-additional-DHCP-server-options

After selecting Configure Options:

003-How-to-configure-additional-DHCP-server-options

As an example, from this list I want to select a DNS server, so I choose option 6 and enter 4.2.2.2 as my chosen DNS server:

004-How-to-configure-additional-DHCP-server-options

The same procedure is used to add other standard DHCP options.  For non-standard selections, there is also a procedure.  I show how to configure option 60 for those in a PXE environment.  First, note that by default, option 60 is not present:

005-How-to-configure-additional-DHCP-server-options

Use the netsh context to add the option:

006-How-to-configure-additional-DHCP-server-options

Once this command is executed, restart the DHCP console and check again:

007-How-to-configure-additional-DHCP-server-options

And option 60 is now present and usable.

If you are a Cisco person, the old standby is to enter the dhcp pool configuration mode and use the question mark to your advantage:

008-How-to-configure-additional-DHCP-server-options

If you are a VoIP person, you may wish to see how to configure the option for Cisco phones to retrieve the TFTP server address:

009-How-to-configure-additional-DHCP-server-options

The given IP address of 1.2.3.4 is merely a (fake) example.  In your environment, you will select the actual address of a reachable TFTP server for your phones to retrieve their boot information.

Until next time…

Mark Jacob
Cisco and CompTIA Network + Instructor – Interface Technical Training
Phoenix, AZ

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