Your network is growing very fast and a common problem about this is assigning IP addresses. Your DHCP server can’t lease IP’s to clients any more because there aren’t any. You might think, damn…I will need to configure the rest of the clients with static IP address or buy a new router. The solution, the Microsoft solution is to create a so-called Superscope, so when your DHCP server is running out of IP addresses all you have to do is create another DHCP scope and add this new DHCP scope to a superscope.
Here I have my DHCP server where I’ve created an address pool of just ten addresses, since I can’t have 254 clients at home.
I will power on now ten of my clients, so addresses will run out on this DHCP scope.
The eleventh client will get an APIPA address since DHCP can’t give any more IP’s.
It is time to create a superscope. Right-click IPv4 and choose New Superscope.
Click Next to skip the Welcome screen.
Give the superscope a name and continue the wizard.
You need to have at lease one scope in order to create a superscope. From the list select one or more scopes you want to add of this superscope then click Next.
and the superscope will be created. Right now clients still can’t get an IP address from the DHCP server. To fix that we need to create a scope and add it to this superscope.
Right-click the superscope and choose New Scope.
Skip the Welcome screen and continue.
Give the scope a name then click Next.
Type the IP address range for this scope. You can’t use the same subnet as the other scope is using, you need a new one.
Continue the wizard using the default settings.
When you get to the Configure DHCP Options screen, choose Yes, I want to configure this options now.
Here you will need to provide a gateway IP address that belongs to this network range. In my case, I can’t use 192.168.50.254 because this is part of the other scope (the one that run out of addresses) and another subnet. Depending what type of router are you using, you can add another IP to the internal interface of the router and use that IP address as gateway for clients.
DNS, very important service. Type the IP of your DNS server and continue the wizard. In my case the router can be a DNS server also, so I’ve added another IP to his internal interface to listed for DNS queries.
Activate the scope then click Finish to close the wizard.
As soon as clients are requesting IP addresses, the DHCP server can now lease those.
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