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Running out of IP- How to Create a VLAN for Wifi Users

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#1 anwarmanha


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Posted 26 May 2016 - 03:35 AM


I am desperately looking for a solution to create a VLAN for Wifi users on a different subnet, all the device connecting to the network has the IP range from to 254 supplied by DHCP Server(Windows server 2012), now we have more device in the network, so we need all the device connecting to Cisco Access point get the IP from to 254 and able browse the internet and access printers 

My Environment has below

 1. Sonicwall TZ 210 firewall -ISP Modem Connected

2.Cisco Catalyst Switch - Sonicwall LAN connected 

 3.Cisco SFP 300 Switch - Connected to Catalyst Switch

 4.Cisco Aironet 2600 Access Point - Connected Csico SFP Switch

 5. DHCP Server

What we completed  the   below steps but not sure this is correct

1.Created a VLAN(VLAN 10) in Cisco SFP switch and assigned port number 24 to VLAN 10

2. Created VLAN(VLAN 10) in cisco access point and assigned the SSID to VLAN 10

what is the next steps? how do i configure the scope in DHCP Server? or any other alternate way

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#2 Wand3r3r


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Posted 26 May 2016 - 09:51 AM

Normally you don't use vlans to address a shortage of ip addresses. After all you can not use the same subnet on each vlan if that is what you were thinking.  You have to redo your ip plan.


You have two options:

1. redo your subnet plan to a address space.  This means assigning static ips to the servers, equipment then configuring dns and dhcp server for the new scope. Update AD.

2. supernet your existing address space.  You have to update AD sites and services as well as dns/dhcp

   a. /23 [ subnet mask] gives you a range of - for 510 hosts

   b. /22 [ subnet mask] gives you a range of - for 1024 hosts.  This means you can leave your existing assigned ip addresses but just need to change the subnet mask on them.  Much easier though short term route

Edited by Wand3r3r, 26 May 2016 - 01:42 PM.

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