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How do you change the subnet mask for the entire domain?

I need to change our subnet mask from 255.255.255.0 to 255.255.0.0. I know for all the static equipment I have to do it manually, so my question is how do I do it so it gets applied to the entire domain.

CompProbSolv

What are you using for a DHCP server? You would make the change there.

CompProbSolv

In newer Windows servers, you will find it under the General Properties of the Scope in the DHCP manager. You will likely have to delete and recreate the scope to change the netmask.

Brian Pierce

Once a scope is created then you can't change the subnet mask - you have to delete the scope and recreate it with the new mask

ASKER CERTIFIED SOLUTION

Stelian Stan

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David Johnson, CD

SetStaticIP.ps1
$wmi = Get-WmiObject win32_networkadapterconfiguration -filter "ipenabled = 'true'"
$wmi.EnableStatic($wmi.IPAddress[0], "255.255.0.0")
$wmi.SetGateways("$wmi.DefaultIPGateway, 1)

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J.R. Sitman

ASKER

Ok I under stand what needs to be done.

@clonyxlro please clarify "It also require you to change all subnet host and gateway.

J.R. Sitman

ASKER

while creating the new scope I got the attached error. Should I deactivate the existing scope first?
dhcp.png

J.R. Sitman

ASKER

Should I also change the subnet mask of the DHCP server first?

SOLUTION

Brian Pierce