We have a Server 2008 machine acting as a DHCP server. Currently our DHCP scope is between 192.168.0.16 to 192.168.0.225. Our default gateway address (Fortigate 80C Firewall/Router) is 192.168.0.X and subnet mask is 255.255.255.0, DNS address is 192.168.0.3
This scope was enough for us, until of late, when we require more devices to be connected to our network. Therefore I created a new scope of the same DHCP server for leasing extra addresses between 192.168.1.16 to 192.168.1.255. Since the IP address and default gateway has to be of the same subnet, I gave 192.168.1.X (subnet mask: 255.255.255.0) as a secondary IP address to the same LAN port on our Fortigate firewall. I am able to ping the firewall with this new IP address from anywhere within our network. So on the new DHCP scope, i gave this new 192.168.1.X as the default gateway address, the DNS server address i gave the same old 192.168.0.3 address.
I deactivated the old scope and tried to connect a few computers onto our network. They were unable to get IP addresses from the new scope. Could you please help figure out what i am doing wrong here? Or is there some additional steps to be done that i'm not aware of? please help.
also, all of our main servers like exchange server, sql server are all on 192.168.0.xxx
Once i get the new DHCP scope working, will the PCs connecting to this newly leased ip addresses starting with 192.168.1.xxx have any problem connecting to the above mentioned server with the address 192.168.0.xxx ?