Controller-less WLANs

How does an Instant AP choose an IP subnet for clients when "Virtual Controller is assigned on an SSID" ?

by on ‎07-03-2014 11:01 AM

Product and Software: This article applies to all Instant Access Points running Aruba Instant OS 6.1.3.4-3.1.0.0_35320.

 

While creating a new WLAN network on IAP, we basically have two options, to specify network subnet:

 

  • Virtual Controller Assigned
  • Network Assigned

rtaImage.jpg

 

 

Selcting "Virtual Controller Assigned" would allow the virtual controller to choose IP subnet for the SSID being configured and thereby acts as DHCP server for the clients connecting to this wireless network.

So, when it comes to choosing an IP subnet, vitrual controller has some intelligence built-in to avoid duplicate subnets on network. It does this by verifying its own IP address. If the IP address of the virtual controller is in 192.168.11.x/24 subnet then it chooses 172.16.11.x subnet for wireless network

If the virtual controller IP address is NOT in 192.168.11.x  network but in some other subnet then controller would use this (192.168.11.x) subnet for wireless network.

Screenshots of both these situations are shows below:

rtaImage (1).jpg

NOTE: Prior to InstantOS version 6.1.3.4-3.1.0.0, the wireless users IP subnet was /24 subnet, but starting from 3.1 the users subnet is changed  /23.

 

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