That's the way our networks are setup, Jack.   We usually run 10 VLAN's per school.    The first 4 Class C subnets are for machine access.
The next Class C is used for Wireless, one more for VOIP  and the remainder are used for future use.   We run everything back to a Layer 3 switch that is configured with
An IP helper address of the local DHCP server.   Very easy to setup and maintain.    If you are located in subnet 192.168.20.X then you will get a DHCP address for the 20 subnet.

There really isn't a need to go to a Class B.   You have 254 Subnets available.

Keeping broadcast traffic to a minimum is the key.

From: School Information Technology Discussion [mailto:[log in to unmask]] On Behalf Of Jack Barnes
Sent: Monday, March 07, 2011 4:06 PM
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Subject: Re: Wireless APs - runing out of addresses

I'm not sure if its the Cisco Switches and/or that Seth Moore really knows what he is doing with our switches but we have numerous VLANs to stop broadcasts as well as to deliver different DHCP settings.  Our IP phone system is on different VLANs as well.  The wireless network is on its own VLAN.  It has been setp this way for the past 6 years with no problems.


Jack W. Barnes, CNE
Head Network Administrator
CCSU
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Office 802-857-7000
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