Configuring DHCP for two separate subnets in same lan

dhcpscope

I have 192.168.1.0/24 network right now. As number of users growing this is getting difficult to manage them. Hence I added one DHCP server in network with two scopes.
One is for 192.168.1.0/24 & another one is for 192.168.2.0/24.

But I am not able get the IP lease from 2.0 scope configured in DHCP server.
As I am relatively unfamiliar with DHCP whole this years. Its getting little bit tricky for me right now.

Thanks,
Sandesh

Best Answer

You don't mention what DHCP server you are running, but if Windows and you really want to use 2 subnets, then you need what is called a superscope.

https://technet.microsoft.com/en-us/library/dd759168.aspx

By using a superscope, you can group multiple scopes as a single administrative entity. With this feature, a DHCP server can:

  • Support DHCP clients on a single physical network segment (such as a single Ethernet LAN segment) where multiple logical IP networks are used.

But the above really isn't the best design. You should consider alternatives.

If you are able, you might want to consider adjusting your network mask of your existing subnet instead though, so that your subnet is larger instead of having two subnets. If you don't have lots of statically configured systems this should be pretty easy. Adjust the mask on network interface of all statically configured hosts, adjust the mask in your DHCP scope.

It also might be time to consider implementing VLANs and moving some of your equipment to separate VLANs, and networks. Good options for this is your wireless network devices, IP phones, servers, and so on.

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