Expanding IP range on DHCP server for 800+ devices
We are expanding the internet access to the entire school body and we will need 800+ ip addresses to accommodate them all. the existing DHCP range is 192.168.1.0 with a Mask of 255.255.255.0 the default Gateway is at 192.168.1.254. if i open the mask to 255.255.248.0 it moves it to a class B network, so does that mean i have to change my existing ip address range from 192.168.x.x to a class B range? If i set the range from 192.168.1.0 to 192.168.7.255 using subnet mask of 255.255.248.0 I will have to move the Default Gateway from 192.168.1.254 to something outside the range. i tried to start the rang at 192.168.2.1 to keep the DFGW at 192.168.1.254 but i get an error saying the gateway is not on the correct subnet? Is there a better way to do this?
You don't *have* to, but you do need to be sure that the gateway address stays out of the DHCP range.
How is the school laid out? VLANs may make more sense. You might have VLANs by floor, by type (wired, wireless, security devices, etc). It adds complexity, but also introduces better organization if done correctly.