topic Re: Wireless Speed Issue in Wireless

Wireless Speed Issue

vinovinom — Sun, 04 Jul 2021 02:07:37 GMT

Problem: When trying to connect to the network using AP it takes about 10 - 15 secs to get reply. But if connected through ethernet its as normal.

Scenario: 2 WLC ----> Cisco Switches (3550/3750) ----- > Cisco AP ----> Scanners/Guest Vlans. Authentication is done by Cisco ACS.

I just want to know where to start troubleshooting this problem. All the networking bit is working properly, but its just speed issue.

Your comments are of much value.

Thanks

Vin

Re: Wireless Speed Issue

Leo Laohoo — Thu, 26 Aug 2010 22:29:29 GMT

All the networking bit is working properly, but its just speed issue.

A few things to look for:

1. What model is your AP?

2. Have you done a wireless site survey?

3. What is the signal strength of the AP to the area where you are observing low speed?

4. What is the make and model of your scanner?

5. Some scanners don't like hidden SSID and prefer broadcast SSID.

6. Have you checked for signal interference from nearby APs?

Re: Wireless Speed Issue

vinovinom — Fri, 27 Aug 2010 06:31:12 GMT

Hi Many thanks for ur reply... I will try to find out more info as I don't have them at present...

Re: Wireless Speed Issue

vinovinom — Thu, 02 Sep 2010 08:52:29 GMT

1. What model is your AP? ---------- AIR-LAP1252AG-E-K9

2. Have you done a wireless site survey? --- Survey done.

3. What is the signal strength of the AP to the area where you are observing low speed? --- Seems to be good

4. What is the make and model of your scanner? ---- not known yet.

5. Some scanners don't like hidden SSID and prefer broadcast SSID. -- SSID Broadcasted.

6. Have you checked for signal interference from nearby APs? --- Interference not checked.

Only thing that I need to add to it is that there is a separate Wifi Vrf used for this Wifi Implementation and devices authenticated with ACS 5.0.

Thanks

Vin

Re: Wireless Speed Issue

vinovinom — Thu, 02 Sep 2010 09:13:29 GMT

Psion Teklogix Barcode scanner

Regards

Vin

Re: Wireless Speed Issue

George Stefanick — Fri, 10 Sep 2010 01:06:23 GMT

How do you know the network is slow? What is happening ...

Do you have other type of wireless clients (laptops, phones etc ) what is their performance?

Re: Wireless Speed Issue

vinovinom — Fri, 10 Sep 2010 08:33:37 GMT

Hi George

What we had tested (using dhcp) was an application that runs on a Scanner and it takes 15 secs to run the transactions in it and after 10 mins it gets disconnects. When used with a static IP it takes around 2 secs to do the same.

please share ur thoughts with us.

Thanks

Vin

Re: Wireless Speed Issue

George Stefanick — Fri, 10 Sep 2010 12:46:52 GMT

Ok, but how does that translate to network being slow?

So what is the nature of the application ? Are you stating it is taking a long time to get a DHCP? Can you walk through the steps of what is happening? What type of handhelds motorols, LXEs, Intermec ?

Re: Wireless Speed Issue

vinovinom — Fri, 10 Sep 2010 13:42:47 GMT

Well usually the Psion Scanner devices have this application running on it and user logs into the application via the scanner. This access to the application is very slow. The same devices aer used in another WIFI network with the same WLC with a different SSID and it works fine.

SSIDs are not broadcasted and also there is WPA security with additional ACS security.

Vin

Re: Wireless Speed Issue

George Stefanick — Fri, 10 Sep 2010 16:00:39 GMT

wireless troubleshooting is backwards engineering, i like to call it .. Lets do these so we can get a base line...

1) Test this same app on the switch the controller plugs into.. Extend the vlan if need be. Is the performance same, better or worse

2) Connect a laptop to your wireless connection ... is the performance same, better or worse

3) have you check the area with a spetrum analyzer?

4) What channels are your APs? 1,6, 11?

Do you have a network topology ?

Re: Wireless Speed Issue

vinovinom — Fri, 10 Sep 2010 16:29:17 GMT

1)It seems to be fine when connected with the Wired network the issue is when its connecting to the wireless network.

2)Laptop seems to be the encounter same issue when connected.

3)Area has been surveyed prior to installation.

4)Also there was AP channels I am unaware of at present.

Thanks

Vin

Re: Wireless Speed Issue

vinovinom — Thu, 23 Sep 2010 14:31:36 GMT

Hi Guys

I am trying to troubleshoot this issue still ... The issue seems to be only when connecting via dhcp ... I am trying to troubleshoot from the client point of view like running a packet analyzer in the laptop and check what packets client sees and check if I recieve any errors in it... next step would be debugging from the WLC for particular test client MAC and check if any errors...

If anybody else have brighter ideas please do share

Thanks

Vin