Question : Creating a DHCP Superscope to extend the number of avaialble addresses

We are currently exhaisting our avaialble IP addresses and are looking to create a Superscope within our organization.  We are using 192.168.1.0/24 with a mask of 255.255.255.0.  This is a single consolidated location (which now explains the drainign of IP's!) and need to expand as users and devices are added.  I do have the 192.168.6.0 subnet available it use.  

Any suggestions amd/or tips would be welcome!

Answer : Creating a DHCP Superscope to extend the number of avaialble addresses

The approach to this depends on whether your default gateway/router supports multiple IP addresses.  If it does support multiple IP addresses, then http://technet2.microsoft.com/windowsserver/en/library/3967ddab-0b28-4959-8b4d-3052c178731b1033.mspx?mfr=true probably has all the info you need.

However, if you need to keep a single IP address as the default gateway, a different strategy has to be used -  you have to change the subnet mask to group together  a bunch of class C networks (or class B or A networks to be technically correct - I'm a pedantic guy)

When you group together a bunch of class "X" addresses, you MUST munch them in groups of 2, 4, 8, 16. 32. 64 ... etc.  Oh, and if your superscope is a bunch of say 8 networks, your first network MUST start as a multiple of 8 (0 being a multiple of any number).

In your example, you want to include class C networks 192.168.1.0 AND 192.168.6.0.  The smallest single scope that BOTH these networks fit into is 192.168.0.0/21 (or 192.168.0.0 255.255.248.0).  However this also includes ALL IPs from 192.168.0.0 to 192.168.7.255

So all you have to do is change your subnet mask to 255.255.248.0, and you can start merrily adding 192.168.6.x addresses with gay abandon, but exclude addresses 192.168.0.0 - 192.168.0.255 AND 192.168.2.0 - 192.168.5.255 AND 192.168.7.0 - 192.168.7.255

You will ALSO have to change the mask on your default gateway/router to be 255.255.248.0