Wireless Access

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Contributor I
Posts: 34
Registered: ‎09-02-2011

How to prevent clients from frequently jumping VLANs

When our wireless infrastructure was put in place, a bunch of small vlans ( 3 /24 ranges for IP addresses per vlan) were created to reduce the broadcast issues at the time. 

 

Problem we see today is that a client may be placed on a vlan, but after reconnect, it would be switched to a new one. Is there anything that could be done to prevent this from happening too quickly?

 

 

Something like 'sticky vlan'?  If not, I guess we could increase the range of ip addresses in a particular vlan, and then reduce the number of them?

 

Thanks in advance.

 

°(((=((===°°°(((================================================
Guru Elite
Posts: 8,634
Registered: ‎09-08-2010

Re: How to prevent clients from frequently jumping VLANs

Take a look at this:



http://community.arubanetworks.com/t5/Validated-Reference-Design/Single-VLAN
-Architecture-for-WLAN/ta-p/257196

Tim Cappalli | Aruba Security TME
@timcappalli | timcappalli.me | ACMX #367 / ACCX #480
Guru Elite
Posts: 21,261
Registered: ‎03-29-2007

Re: How to prevent clients from frequently jumping VLANs


su_A_ve wrote:

When our wireless infrastructure was put in place, a bunch of small vlans ( 3 /24 ranges for IP addresses per vlan) were created to reduce the broadcast issues at the time. 

 

Problem we see today is that a client may be placed on a vlan, but after reconnect, it would be switched to a new one. Is there anything that could be done to prevent this from happening too quickly?

 

 

Something like 'sticky vlan'?  If not, I guess we could increase the range of ip addresses in a particular vlan, and then reduce the number of them?

 

Thanks in advance.

 


What mechanism is being used to assign VLANs for your devices?

 



Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

Contributor I
Posts: 34
Registered: ‎09-02-2011

Re: How to prevent clients from frequently jumping VLANs

We use external DHCP.  This is for students, so they get lumped into the same group regardless of location. 

 

Single VLAN is the way to go, but not ready to redo the whole thing. 

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Guru Elite
Posts: 21,261
Registered: ‎03-29-2007

Re: How to prevent clients from frequently jumping VLANs

What is wrong with getting a different VLAN when a student reconnects?

 



Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

Contributor I
Posts: 34
Registered: ‎09-02-2011

Re: How to prevent clients from frequently jumping VLANs

 

Internal addresses are matched to an external address via NAT. It seems that the frequency of them jumping vlans gets them a different internal address and hence a new NAT translation is created. But the original stays put for a while. Also, easier to track down.

 

Thanks.

°(((=((===°°°(((================================================
Guru Elite
Posts: 21,261
Registered: ‎03-29-2007

Re: How to prevent clients from frequently jumping VLANs

What mechanism on the controller is assigning the VLAN?

 



Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

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