When the subnet changes, you will have to do a lot of work to remake all your DHCP options because you have to erase the scope to remake it after.

You will need to save this information in order to remake:
  • Excluded IPs
  • Reservation(s)
  • DHCP's scope option(s)
There is an easy way to do it with NETSH:
netsh dhcp server \\”Server” scope “ip_of_scope” dump>c:\dhcp.txt 

Edit the file and change the line:
Dhcp Server \\server add scope 192.168.0.0 255.255.255.128 "Pool DHCP" ""

Save the file and when ready, erase the DHCP scope and issue:
netsh exec c:\dhcp.txt

And voila. The scope will be changed easily!

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