Wireless Medical Device Issue

[M. Wisely]

Hi

We've got a pair of identical wireless medical devices that we've been having issues with, they connect ok initially but after about 45 seconds to 2 minutes they disconnect and they won't reconnect until rebooted

I can't see how this is an issue with our wireless access points. They're connecting with a pre-shared key and have a static ip address (actually they have two, one for an internal network interface that connects to a wired to wireless convertor).

I've attached a debug but the debug looks like the client is just disassociating normally, I don't see anything particularly wrong.

I'd appreciate any opinions/advise anyone has.

Thanks

[Scott Fella]

You need to make sure if your using WPA is that when using WPA you need to only use TKIP. If your using WPA2, then only use AES. Don't use both or mix and match.

post your show WLAN

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[grabonlee]

Hi,

I noticed amongst the logs you attached that there was a reason code of 4 for the deletion of the client. This reason code is associated with User inactivity. Could you check the User Idle timeout on the Controller tab and also the idle timeout on the WLAN SSID advanced config.

[manbaez]

First,  by experience some of this medical devices are tricky on wireless....

Even they say is a 802.11g, the unit radio management info pass thru 802.11b; this mean you will need to turn on at least one off the 802.11b  as supported on your WLC

Signal Coverage some of this unit require to have a GOOD signal if you are receiving less than 80% of the signal they may drop off and not come back up until you reset unit... you might need to checkyour signal level  thru a quick survey and check the unit specs for the radio

As mention by Scott also you security using wrong security may also cuase this problem.

Hope this help you with the troubleshooting and resolution

Thank you,
Manuel Baez
Sales Eng

Need help ? call Sales Acceleration Center(SAC) at Toll Free (USA) :1-800-225-0905 International +1-408-902-4872 or send email to sac-support@cisco.com or Live Chat: http://tinyurl.com/sacucs

[George Stefanick]

Martin,

Are these carefusion / alaris pumps by chance ?

__________________________________________________________________________________________
"Satisfaction does not come from knowing the solution, it comes from knowing why." - Rosalind Franklin
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‎"I'm in a serious relationship with my Wi-Fi. You could say we have a connection."

[Yahya Jaber]

Hi,

i checked the debug, i see this messages

*spamReceiveTask: Jun 07 12:26:24.462: 00:1b:1b:0b:bf:06 Received Idle-Timeout from AP 00:23:eb:2c:ae:90, slot 1 for STA 00:1b:1b:0b:bf:06

go to WLC GUI>Controller>Idle Timeout>set to somthing higher than 300Sec

[Scott Fella]

Just noticed that your using an wireless Ethernet converter/bridge. Since your using static address you might want to add a static arp entry on the L3.

To configure a static ARP mapping, issue the arp ip-address hardware-address type [alias] from the global configuration mode of the router.

Example:

arp 10.10.10.30 20 ca.405a.bc91 arpa

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[M. Wisely]

Thanks for all your responses.

Scott - The WLAN was setup for WPA2 and AES. I'll try adding static arp entries and let you know

Osita - I've set the main idle timeout to 600 secs (was 300) and the idle timeout of the WLAN was disabled

Manuel - I did notice that the signal strength was lower on the device than on my phone, the device connects with a Siemens W774-1 which is inside the steel chassis.

George - They're Siemens devices

Yahya - I've set it to 600 sec

Unfortunately I can't test it at the moment as it's in use (with a wired connection).

Thanks

martin

[Scott Fella]

I don't think that raising the idle timeout will help. If you look at the arp table on the router when the device stops working, see if you see or don't see and arp entry. You might try to enable passive client on the wlan advanced tab. If you don't, then the device isn't sending any info out to the network and the arp is timing out.

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[M. Wisely]

Scott,

Unfortunately we have a lot of older WISM1s and the code on them can't do passive client, there's no check box or command for that as far as I can see.

Thanks

Martin

[Scott Fella]

This might help. This was a workaround for passive clients prior to the feature.

Use the CLI to Configure the MAC Filter on WLC

This document previously discussed how to use the WLC GUI to configure MAC filters. You can also use the CLI in order to configure MAC filters on the WLC. You can use these commands in order to configure the MAC filter on WLC:

Issue the config wlan mac-filtering enable wlan_id command in order to enable MAC filtering. bEnter the show wlan command in order to verify that you have MAC filtering enabled for the WLAN.

config macfilter add command:

The config macfilter add command lets you add a macfilter, interface, description, and so forth.

Use the config macfilter add command in order to create a MAC filter entry on the Cisco Wireless LAN controller. Use this command in order to add a client locally to a wireless LAN on the Cisco Wireless LAN controller. This filter bypasses the RADIUS authentication process.

config macfilter add MAC_address wlan_id [interface_name]
[description] [IP address]
Example:

Enter a static MAC-to-IP address mapping. This can be done to support a passive client, that is, one that does not use DHCP and does not transmit unsolicited IP packets.

>config macfilter add 00:E0:77:31:A3:55 1 lab02 "labconnect" 10.92.125.51
config macfilter ip-address command

The config macfilter ip-address command lets you map an existing MAC-filter to an IP address. Use this command in order to configure an IP address into the local MAC filter database:

config macfilter ip-address
MAC_address IP address
Example:

>config macfilter add 00:E0:77:31:A3:55 1 lab02 "labconnect" 10.92.125.51

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[Scott Fella]

Here is the link

http://www.cisco.com/en/US/tech/tk722/tk809/technologies_configuration_example09186a008084f13b.shtml#CLI-Config

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