How to Configure Additional DHCP Server Options
How to Configure Additional DHCP Server Options
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:
After right-clicking on Server Options:
After selecting Configure 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:
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:
Use the netsh context to add the option:
Once this command is executed, restart the DHCP console and check again:
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:
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:
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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Cisco phone, DHCP server, option 150, option 60, PXE, TFTP server, VoIP
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