Avatar of albevier
albevier asked on

what is the difference between DHCP scope options 004 and 042?

This is one more of idle curiosity than anything. There are two options in a Windows Server DHCP scope -- 004 Time Server and 042 NTP Servers

What's the difference?
DHCPMicrosoft Legacy OS

Avatar of undefined
Last Comment

8/22/2022 - Mon

Log in or sign up to see answer
Become an EE member today7-DAY FREE TRIAL
Members can start a 7-Day Free trial then enjoy unlimited access to the platform
Sign up - Free for 7 days
Learn why we charge membership fees
We get it - no one likes a content blocker. Take one extra minute and find out why we block content.
See how we're fighting big data
Not exactly the question you had in mind?
Sign up for an EE membership and get your own personalized solution. With an EE membership, you can ask unlimited troubleshooting, research, or opinion questions.
ask a question

thanks! I was only vaguely aware of the fact that there was an older time protocol -- and I'd forgotten about that old protocol anyway.


If DHCP options 004 or 042 are configured, the DHCP server will respond with the IP address of the time server

Option 042, if configured, allows you to specify an array of IP addresses corresponding to servers that provide NTP/SNTP
Option 004, if configured, allows you to specify an array of IP addresses corresponding to servers that provide TIME/ITP

Thanks youngrmy,

I took a look at the RFCs that the capedplodder referenced. I had not know that the time/itp had been mostly abandoned.

Do you know if the manner that Windows 2003 uses to track time (i.e. through AD) is yet a different protocol? I noticed that in the registry HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Parameters\Type value is set for NT5DS while instructions for making the server an NTP server ask that you change this value to NTP.

So is NT5DS a third protocol?

This is the best money I have ever spent. I cannot not tell you how many times these folks have saved my bacon. I learn so much from the contributors.

this article should answer all you may need to know the protocol that windows 2000 used was NTP server 2003 uses NT5DS