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SSID broadcasts a secure network but no security configured

Hi,

I have a wireless network using Cisco 1231G AP's in autonomous mode. Each AP is configured with a guest VLAN and this points to a BBSM server.

The issue I'm having is the SSID for guest access is configured as open with no security parameters set. However, my client (CB21AG) sees the network being broadcast sometimes as open and other times as secure.

AP configuration:

ssid bbsm

vlan 295

authentication open

guest-mode

IOS Version: 12.2(13)JA4

Output captured from AP scan logs:

2008-10-01 12:43:36 ,bbsm,00:12:DA:A7:F5:30,-50,Secure,G,1

2008-10-01 12:43:36 ,bbsm,00:12:DA:A7:F3:B0,-71,Open,G,11

2008-10-01 12:43:36 ,bbsm,00:12:DA:AE:A7:B0,-78,Secure,G,2

2008-10-01 12:43:36 ,bbsm,00:12:DA:AE:7B:90,-91,Open,G,10

2008-10-01 12:43:36 ,bbsm,00:12:DA:B6:58:60,-91,Secure,G,13

2008-10-01 12:43:36 ,bbsm,00:12:DA:B6:66:F0,-92,Secure,G,13

2008-10-01 12:43:36 ,BTOpenzone,00:02:8A:A3:04:A4,-71,Open,B,6

2008-10-01 12:43:36 ,hpsetup,02:13:02:00:02:15,-88,Open,G,11

2008-10-01 12:43:36 ,Voyager test,00:16:E3:32:58:A9,-43,Open,G,5

2008-10-01 12:43:56 ,bbsm,00:12:DA:A7:F5:30,-52,Secure,G,1

2008-10-01 12:43:56 ,bbsm,00:12:DA:A7:F3:B0,-69,Secure,G,11

2008-10-01 12:43:56 ,bbsm,00:12:DA:AE:A7:B0,-77,Secure,G,2

2008-10-01 12:43:56 ,bbsm,00:12:DA:AE:7B:90,-89,Secure,G,10

2008-10-01 12:43:56 ,bbsm,00:12:DA:B6:58:60,-91,Secure,G,13

2008-10-01 12:43:56 ,bbsm,00:12:DA:B6:66:F0,-92,Secure,G,13

2008-10-01 12:43:56 ,bbsm,00:12:DA:AE:9B:00,-93,Secure,G,5

2008-10-01 13:20:36 ,bbsm,00:12:DA:A7:F5:30,-52,Open,G,1

2008-10-01 13:20:36 ,bbsm,00:12:DA:A7:F3:B0,-67,Open,G,11

2008-10-01 13:20:36 ,bbsm,00:12:DA:B6:58:60,-91,Open,G,13

2008-10-01 13:20:36 ,bbsm,00:12:DA:AE:A7:B0,-75,Open,G,2

2008-10-01 13:20:36 ,bbsm,00:12:DA:AE:7B:90,-94,Open,G,10

2008-10-01 13:20:36 ,BTOpenzone,00:02:8A:A3:04:A4,-69,Open,B,6

2008-10-01 13:20:36 ,Voyager test,00:16:E3:32:58:A9,-40,Open,G,5

Any ideas or help on why I sometimes see the ssid broadcast as secure?

Thanks

Simon

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