Need help about reaching subnet

[serfasit]

Hello,   I'am using FortiGate 60E device. All my network are in one vlan in subnet 192.168.1.x. I using 1 WAN port and 1 LAN port.  Now i need more free IP so I need to reach for example subnet 192.168.2.x. What I need to do?   Thank you

[Dave_Hall]

Yes, but keep in mind you should be following the rules for subletting.  The min. net mask for 510 hosts network is /23 (net mask 255.255.254.0), which only works with certain IP ranges.  192.168.0.1 to 192.168.1.254 works, but not 192.168.1.1 to 192.168.2.254 (using that same net mask).  If you are adamant about using the 192.168.1.1 to 192.168.2.254 range, you need to go to /22 (net mask 255.255.252.0), which gives you 1022 hosts/net - the devices on your network will need to be using the same net mask as on the fgt.

serfasit wrote:

So all what I need to do is simple change Fortigate net mask?