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

albevier asked
Medium Priority
Last Modified: 2010-04-21
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?
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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 article should answer all you may need to know the protocol that windows 2000 used was NTP server 2003 uses NT5DS

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