1

I'm using this command:

netsh dhcp server \\serverName 10.11.12.3 show optionvalue

and am getting back two values for option 51:

Changed the current scope context to 10.11.12.3 scope.
Options for Scope 10.11.12.3:
For user class [Default BOOTP Class]:
OptionId : 51
Option Value:
Number of Option Elements = 1
Option Element Type = DWORD
Option Element Value = 691200
DHCP Standard Option :
OptionId : 51
Option Value:
Number of Option Elements = 1
Option Element Type = DWORD
Option Element Value = 14400
...

The one shown in the GUI 4hrs (14400).

Why is there a second value of 691200?

2

I have to admit that I've never looked specifically at option 51 before but your question intrigued me so I did some testing. I think the answer is that you have BOOTP enabled with a lease duration that's different for BOOTP clients than the lease duration for DHCP clients.

Here are some screenshots illustrating this:

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