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How to change subnet mask in dhcp scope (SBS 2008)

Posted on 2010-09-08
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Last Modified: 2013-05-08
Hi
Currently,
the IP of my server is : 10.0.0.7/8

Now i need to change it 10.0.0.7/26
which means, subnet mask have to change to 255.255.255.192

I have changed the Ip of the server from Network management.

but still other user is getting /8 subnetmask due to dhcp server
so i went to change the options in dhcp scope sections
but i cant change subnet mask

so how will i be able to change the subnet maks from dhcp configuration.. so that all dhcp client get /26 subnet..

thanks for your help .
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Question by:fosiul01
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Krzysztof Pytko earned 500 total points
ID: 33625258
Sorry, you can't do that. You have to recreate whole scope, delete it and then configure once again with new subnet mask.
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by:fosiul01
ID: 33625283
thats done my job. i was thinking that but was not sure

thanks .
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by:Krzysztof Pytko
ID: 33625293
You're welcome
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Expert Comment

by:HostOne
ID: 39150610
Late entry, I know but you can actually do this. I am only adding this comment now so the next person looking for help finds this.

First, dump to file your existing DHCP scope settings:
(CMD)

netsh -c dhcp server 192.168.2.5 scope 192.168.2.0 dump > c:\test.txt

The file will be something like:

 Changed the current scope context to 192.168.1.0 scope.

 Dhcp Server 192.168.1.24 add scope 192.168.1.0 255.255.255.0 "Vlan-1" "Vlan-1"
 Dhcp Server 192.168.1.24 Scope 192.168.1.0 set state 1

Now you can modify that file and change the subnet form 255.255.255.0 to whatever and run it back through:

C:\>netsh exec c:\dhcp.txt
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