IP addresses are depleting rapidly.
IP addresses are depleting rapidly.
Adjusting a DHCP scope often requires several careful actions to ensure proper functionality without disrupting device connections. Start by shortening your DHCP lease duration, then modify the subnet mask of all static devices to 255.255.254.0 safely. Next, configure reservations on your DHCP server for each static device using their MAC addresses so they remain assigned. For the scope change, set the subnet mask to 255.255.254.0 and the range to 192.168.0.30 through 192.168.1.245. Finally, restore a longer lease time that aligns with standard practices.
When working with a flat network, problems often arise. You should create subnets—switching to a larger address space would be ideal if needed. Set up VLANs like this: network 10.100.1.0 with subnet 255.255.255.0 and gateway 10.100.1.1 (static). Configure multiple client VLANs such as network 10.10.1.0 with subnet 255.255.255.0 and gateway 10.10.1.1 (DHCP). Afterward, you can configure the DHCP server to assign multiple scopes for client VLANs. Use ip helpers to forward DHCP broadcasts from client VLANs to the server. It’s a big project, but using subnets now will save you later.