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to many legacy clients on radio

We been seeing this message in Airwave 7.7 and was wondering if anyone else has seen this and if you have an interpretation what this indicator is suggesting.  The indicator below was reported from an AP225 but we've also seen this on other AP's.  I know there are not 8 legacy clients on this radio.  Anyone have any insight?

 

Indicator

Value

Ideal

Too Many Legacy Clients On Radio

8

≤ 3

Moderator

Re: to many legacy clients on radio

When looking at that AP's monitor page (before the radio page), use the funnel filter on the connection column to see what kinds of connections are present, and then sort by interface to get all clients on the radio you're focusing on grouped together.

 

clients.jpg

 

Clients connecting at an 802.11a / 802.11b rate are considered legacy clients.  Any client connecting on less than 802.11n are considered legacy clients.

 

legacy clients.jpg


Rob Gin
Senior QA Engineer - Network Services
Aruba Networks, a Hewlett Packard Enterprise Company
DSP
Contributor II

Re: to many legacy clients on radio

 

Hello, 

 

We are having similar issues and had opened a TAC case. 

 

Would be interested to know how did you solve this situation or if anyone has any advise from their own experience.

 

Thanks, 

DSP

Guru Elite

Re: to many legacy clients on radio

DSP,

 

That trigger in Airwave is fairly arbitrary.  It does not automatically guarantee problems, but it lets you know that you have legacy clients on an points that exceeds a threshold. 



Colin Joseph
Aruba Customer Engineering

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

DSP
Contributor II

Re: to many legacy clients on radio

 

Hello Cjoseph, and thanks for your reply. 

 

The problem we are having is that after few weeks working normally and while clients are able to get IP@, and complete authentication the AP stops forwarding traffic on any of the SSIDs.

 

What I would like to understand is what is triggering this condition the AP runs into after sometime like if there were a memory leak condition met ... 

 

AP is a 225 and I would expect it to be able to manage 38 connections even if there are legacy devices. The AP is deployed in a HD area.

 

Too Many Total Clients Diagnostics

Indicator

Too Many Total Clients

Value

38

Ideal

≤20

Explanation

The total number of wireless clients currently associated to this AP. Too many clients on an AP can strain CPU and memory resources.

Resolution

ARM should load balance. Sustained high rates will require adding capacity or more APs.

 

Anywhoo will wait an see what does TAC investigations lead us, I just found these entries on the AP TS: 

 

<2>[21594.150173] kernel BUG at drivers/net/gianfar.c:2912!

<4>[21594.210601] Oops: Exception in kernel mode, sig: 5 [#1]

 

And I am concern behind these warning of too many clients on radio we may be facing an DoS attack : 

 

In January 19th 2016 a vulnerability was discovered in the Linux kernel. This vulnerability could allowed a regular user to escalate privileges.

Red Hat has been made aware of a vulnerability affecting the kernel that ships with Red Hat Enterprise Linux 7 kernel and derivatives. CVE-2016-0728 documents and exploit that could allow a skilled attacker to execute arbitrary code and also be used to escalate their privileges on the system. The attacker must be able to run custom code on the account; in the most common configuration, this requires them to have a login and shell account on the target system.

 

DSP

 

Guru Elite

Re: to many legacy clients on radio

Please allow TAC to take a look at your tech support in your controller to find out what your next move should be.  That is the best option, here.



Colin Joseph
Aruba Customer Engineering

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

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