I am using IPCOP v2.1
I currently have a blue network with the range 192.168.0.0/23.
I would like to change it to use 192.168.200.0/23.
Is there a way to simply make the change, or am I required to reinstall and reconfigure from scratch?
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From the shell, you can just run setup and change the ip range for the blue adapter.
The options you do are: Networking -> Address Settings -> Blue
Change the IP address to the desired setting and make sure that the subnet is correct to make the network the correct size. Given you have it working with a /23 you don't need to change the subnet.