MaxRetries and Disassociation Problem

cameron.murray · ‎10-21-2007

We are having a problem with around 10 Access Points in a hall on one site.

It would appear that clients are connecting to a close access point and then being disassociated from it, and connected to another access point that is distant with less signal strength

Our syslog servers are clearly showing this problem:

2007-10-16 11:44:22 Local7.Info 10.1.1.234 32: *Mar 2 01:31:25.822: %DOT11-6-ASSOC: Interface Dot11Radio0, Station 0015.0035.c3ac Associated KEY_MGMT[WPA PSK]

2007-10-16 11:44:22 Local7.Warning 10.1.1.234 33: *Mar 2 01:31:26.110: %DOT11-4-MAXRETRIES: Packet to client 0015.0035.c3ac reached max retries, removing the client

2007-10-16 11:44:23 Local7.Info 10.1.1.235 52: *Mar 2 01:31:24.696: %DOT11-6-DISASSOC: Interface Dot11Radio0, Deauthenticating Station 0015.0035.c3ac Reason: Sending station has left the BSS

2007-10-16 11:44:23 Local7.Info 10.1.1.234 34: *Mar 2 01:31:26.111: %DOT11-6-DISASSOC: Interface Dot11Radio0, Deauthenticating Station 0015.0035.c3ac Reason: Previous authentication no longer valid

2007-10-16 11:44:24 Local7.Info 10.1.1.237 142: *Mar 2 01:31:27.652: %DOT11-6-ASSOC: Interface Dot11Radio0, Station 0015.0035.c3ac Associated KEY_MGMT[WPA PSK]

2007-10-16 11:44:31 Local7.Warning 10.1.1.237 143: *Mar 2 01:31:35.438: %DOT11-4-MAXRETRIES: Packet to client 0015.0035.c3ac reached max retries, removing the client

2007-10-16 11:44:32 Local7.Info 10.1.1.237 144: *Mar 2 01:31:35.439: %DOT11-6-DISASSOC: Interface Dot11Radio0, Deauthenticating Station 0015.0035.c3ac Reason: Previous authentication no longer valid

2007-10-16 11:44:34 Local7.Info 10.1.1.236 72: *Mar 2 01:31:35.275: %DOT11-6-ASSOC: Interface Dot11Radio0, Station 0015.0035.c3ac Associated KEY_MGMT[WPA PSK]

Any help would be greatly appreciated.

rnigam · ‎10-22-2007

A common interference problem. Can be averted

a) a proper site survey

b ) making it for sure that if you are using the b/g radio then you are using the non overlapping channels.

c) fiddling with the power.

cameron.murray · ‎10-22-2007

I suspect that it is to do with noise between APs, and goes along with b)

The hallway is around 40-50m long and has 6 APs distributed like

x-------x---------x-----------x

---x---------x---------x-----------

They are in a 4 channel spread

There is no physical barrier between APs in the hallway, however another 7 ap's are in close vacinity in seperated rooms

nitin mohan · ‎07-17-2013

1) check IOS ver: upgrade it

2) "packet retries 128 drop-packet" put this command on each radio interface

3) disable the TKIP authen if possible use aes-ccm

4) disable aironet extenstions

let me know if this helps