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Kismet discards good packets

Hi all. I'm trying to do a test using Kismet with an Atheros chipset. I can start kismet without problems in monitor mode. But it seems kismet sees only management and broadcast packets. All directed packets kismet lists as "discarded". I noticed also 2 things that I don't understand:

1) The network I connect to is listed as using WEP. However, nobody uses any key to connect.
We access the network just through a user & pass system. (The network is used by students in my residence). Is kismet getting something wrong or it's normal?
2) The count of encrypted packets in kismet was increasing. Those packets came from a T-mobile network (a public network providing internet connection under subscription). T-mobile is listed as unencrypted in kismet. Then why does it show some crypted pakets?
(Screenshot: http://vsla.eresmas.com/files/kismet2.html)

Anyone knows why kismet discards all directed packets? I'm using Kismet version 2005.04.R1a. I installed it from the debian pkgs in Sarge. The relevant configuration parameters are copied below.
The driver of my Atheros card (a TP-LINK TL-WN510) was compiled using madwifi sources. The sources were downloaded from debian.org and didn't give any error in the compilation. As the debian way, I created a .deb package using make-kpkg.

I wonder if I'm missing any piece in kismet config or other small silly thing. Please, tell me if you need any more details about my system.



# User to setid to (should be your normal user)

# Sources are defined as:

# Do we log corrupt packets? Logging these is usually not a bad idea.

lspci -vv (Info about my card's chipset)
0000:06:00.0 Ethernet controller: Atheros Communications, Inc.: Unknown device 001a (rev 01)
Subsystem: Atheros Communications, Inc.: Unknown device 1052
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 168 (2500ns min, 7000ns max), Cache Line Size: 0x08 (32 bytes)
Interrupt: pin A routed to IRQ 11
Region 0: Memory at 10c00000 (32-bit, non-prefetchable) [size=64K]
Capabilities: [44] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=2 PME-

iwconfig ath0 (Info when the card is 'connected' to the A.P.)
          IEEE 802.11g  ESSID:"justaname"
          Mode:Managed  Frequency:2.417 GHz  Access Point: 00:17:0E:D9:C3:20
          Bit Rate:36 Mb/s   Tx-Power:18 dBm   Sensitivity=0/3
          Retry:off   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:off
          Link Quality=43/94  Signal level=-52 dBm  Noise level=-95 dBm
          Rx invalid nwid:46  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:1  Invalid misc:1   Missed beacon:0

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