Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

Disconnecting while on Wireless Network

Hi

Some users raised issue for disconnection while accessing network via wireless. AP model - AIR-AP1131AG-E-K9. Cable connecting to AP is likely not an issue. what should be checked on the wireless lan controller to identify the issue

any comments will be appreciated

Thanks in advance

Vishal

  • Getting Started with Wireless
1 ACCEPTED SOLUTION

Accepted Solutions
Hall of Fame Super Gold

Re: Disconnecting while on Wireless Network

we connected 2 trouble users machine with wired network connection and no issue reported.

Yes.  I've seen server issues/misconfiguration where wired connection works (very well) but wireless won't work.

Others still reported issues, we started pinging continiously to Gateway from them and let them work as well - again noticed that wireless connection goes off and comes back again within seconds.

Do a continuous ping "-t" and with 1500 size packets.

ping to gateway is lost as well during disconnection of wireless.

Use different clients and not just the ones with issues.  If the clients have different wireless NICs then good.  If they are the same, even better.

You've posted the output of the RSSI level but didn't mention anything about which band/protocol was used.  If these were 802.11b/g can I ask if you force the clients to negotiate to 802.11a/n if necessary?

Can I also ask if you can Wireshark the transaction and see if there are any indication of server issues?  Look at the event logs on the servers for issue.

Check every hop from the WAP down to the server(s).  See if you see any discrepancies:  speed/duplex mismatch, CRC errors, interface disconnections, output drops, reliability/Tx/Rx drops, etc. 

17 REPLIES
Hall of Fame Super Gold

Re: Disconnecting while on Wireless Network

Id first be checking the signal strength.

Next, I would be looking for signal interference.

What protocol do disconnection occur? 802.11b?

Sent from Cisco Technical Support iPad App

Hall of Fame Super Silver

Re: Disconnecting while on Wireless Network

You need to tell more info. I'm guessing this is a standalone AP? How many and what are they saying when about when they disconnect? What did you do to troubleshoot the issue so far? Is the issue reproducible? What does the logs show and what authentication method are you using.

Sent from Cisco Technical Support iPhone App

Thanks, Scott *****Help out other by using the rating system and marking answered questions as "Answered"*****
New Member

Re: Disconnecting while on Wireless Network

Thanks both for input

AP is joined to controller not standalone.

Total of 15 users connect to the AP but around 6 to 8 complaint disconnection and even when there are 5 users still some complaint disconnection.

  1. I checked the cable
  2. ping to the AP with no timeout
  3. restarted the AP
  4. Authentication is  [WPA + WPA2][Auth(802.1X)]     &&  [WPA2][Auth(PSK) users on both these SSID complaint
  5. Signal Strengh is good not too far from the AP

Looking at time statistics for AP

New Member

Re: Disconnecting while on Wireless Network

Hi leo

how to check interference from the controller, can the WLC select the best channel to avoid interference.

How to enable log on WLC for specific AP

thanks

Vishal

Hall of Fame Super Gold

Disconnecting while on Wireless Network

WAP uptime of only "7 hours"????

I'd be looking as to WHY?  If the answer is power then the question I'd be asking you is how is this WAP being powered?

New Member

Disconnecting while on Wireless Network

Hi leo

I mentioned in the post I restarted the AP, maybe not clear.

The AP is sourced power with power injector.

How do i check interference and sort this out if issue noticed

thanks

Vishal

Hall of Fame Super Gold

Re: Disconnecting while on Wireless Network

Ok, so if it's controller-based then I'd be looking if Dynamic Channel Assignment (DCA) and Tx Power Assignment is on by default.

Next look at each client to see what signal strength the AP can see the clients.

Is this issue happening to everyone of just a few clients?  Or specific clients?

New Member

Re: Disconnecting while on Wireless Network

Dynamic Channel Assignment Algorithm

Automatic

Tx Power Level Assignment Algorithm

On Demand

on couple of clients i noticed the signal strength is same and good

it happens to everyone not specific ones

Hall of Fame Super Gold

Re: Disconnecting while on Wireless Network

on couple of clients i noticed the signal strength is same and good

Define "same and good"??  3/5?  4/5?  5/5?   This is only the signal strength from the client to the WAP?  What about the signal strength from the WAP to the client?  Go to the main page of the WLC and click on "Clients" link on the left-hand corner.  Click on the MAC address of the client that are reporting to have problems and look under RSSI.  What are their values.

When you mean by "disconnection" does this mean the clients get disconnected on ALL applications (such as email, web, etc) or just a particular application (email and/or web are OK but they can't access shared directories or payroll applications).

1427
Views
0
Helpful
17
Replies