why can I just capture the 802.11 Association Request frames?

"小容" <[email protected]>
Newsgroups gmane.network.ethereal.user
Message-ID <[email protected]> 
Hi Sirs,
    When I use the ethereal capture 802.11 control frames on my
network adapter I just can sniff the "Association Request".I can't see
any other frames although there are more than one AP and mobile node
in my environment.

I attach my operations below .Could you help me?
Thank you in advance!

[root@MIPV6 ~]# iwlist eth1 scan
Warning: Driver for device eth1 has been compiled with version 19
of Wireless Extension, while this program supports up to version 17.
Some things may be broken...

eth1      Scan completed :
          Cell 01 - Address: 00:0F:B5:93:4F:C1
                    ESSID:"netgear2"
                    Protocol:IEEE 802.11bg
                    Mode:Master
                    Channel:11
                    Encryption key:off
                    Bit Rate:1 Mb/s
                    Bit Rate:2 Mb/s
                    Bit Rate:5.5 Mb/s
                    Bit Rate:6 Mb/s
                    Bit Rate:9 Mb/s
                    Bit Rate:11 Mb/s
                    Bit Rate:12 Mb/s
                    Bit Rate:18 Mb/s
                    Bit Rate:24 Mb/s
                    Bit Rate:36 Mb/s
                    Bit Rate:48 Mb/s
                    Bit Rate:54 Mb/s
                    Quality:85  Signal level:0  Noise level:0
                    Extra: Last beacon: 3552ms ago

[root@MIPV6 ~]# iwconfig eth1
Warning: Driver for device eth1 has been compiled with version 19
of Wireless Extension, while this program supports up to version 17.
Some things may be broken...

eth1      IEEE 802.11b  ESSID:"netgear2"  Nickname:"ipw2100"
          Mode:Managed  Frequency:2.462 GHz  Access Point: 00:0F:B5:93:4F:C1
          Bit Rate=11 Mb/s   Tx-Power:16 dBm
          Retry min limit:7   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:off
          Link Quality=100/100  Signal level=-46 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:169   Missed beacon:0

[root@MIPV6 ~]# iwconfig eth1 mode monitor
[root@MIPV6 ~]# iwconfig eth1
Warning: Driver for device eth1 has been compiled with version 19
of Wireless Extension, while this program supports up to version 17.
Some things may be broken...

eth1      unassociated  ESSID:off/any  Nickname:"ipw2100"
          Mode:Monitor  Frequency=2.462 GHz  Access Point: 00:00:00:00:00:00
          Bit Rate=0 kb/s   Tx-Power:16 dBm
          Retry min limit:7   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:off
          Link Quality:0  Signal level:0  Noise level:0
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:169   Missed beacon:0

[root@MIPV6 ~]# tethereal -i eth1
Capturing on eth1
  0.000000 00:00:00_ff:ff:ff -> 00:cf:ff:00:0f:80 IEEE 802.11
Association Request,SN=1273,FN=3[Malformed Packet]
  0.086448 00:3a:01:00:13:ce -> TremonEn_00:0f:50 IEEE 802.11
Association Request,SN=1273,FN=3[Malformed Packet]
  0.086901 08:3a:01:00:13:ce -> 00:d2:61:00:0f:50 IEEE 802.11
Association Request,SN=1273,FN=3[Malformed Packet]
  0.087225 00:00:00_ff:ff:ff -> 00:d1:ff:00:0f:80 IEEE 802.11
Association Request,SN=1273,FN=3[Malformed Packet]
  0.087532 00:3a:01:00:13:ce -> 00:cf:61:00:0f:50 IEEE 802.11
Association Request,SN=1273,FN=3[Malformed Packet]
  0.087846 08:3a:01:00:13:ce -> TremonEn_00:0f:50 IEEE 802.11
Association Request,SN=1273,FN=3[Malformed Packet]
  0.088101 00:3a:01:00:13:ce -> 00:d1:61:00:0f:50 IEEE 802.11
Association Request,SN=1273,FN=3[Malformed Packet]
  0.088421 00:3a:01:00:13:ce -> 00:d2:61:00:0f:50 IEEE 802.11
Association Request,SN=1273,FN=3[Malformed Packet]
  0.088677 00:3a:01:00:13:ce -> 00:d3:61:00:0f:50 IEEE 802.11
Association Request,SN=1273,FN=3[Malformed Packet]
  0.000070 00:00:00_ff:ff:ff -> 00:d1:ff:00:0f:80 IEEE 802.11
Association Request,SN=1273,FN=3[Malformed Packet]
  0.004225 00:00:00_ff:ff:ff -> 00:c6:ff:00:13:40 IEEE 802.11
Association Request,SN=1270,FN=15[Malformed Packet]
  0.005107 00:3a:01:00:13:ce -> 00:d2:61:00:0f:50 IEEE 802.11
Association Request,SN=1273,FN=3[Malformed Packet]
  0.005422 00:00:00_00:0f:b5 -> 00:cf:c1:03:00:d4 IEEE 802.11
Association Request[Malformed Packet]
  0.102470 00:00:00_ff:ff:ff -> 00:d2:ff:00:0f:80 IEEE 802.11
Association Request,SN=1273,FN=3[Malformed Packet]
  0.204868 00:00:00_ff:ff:ff -> Cisco_00:0f:80 IEEE 802.11 Association
Request,SN=1273,FN=3[Malformed Packet]
  0.275995 00:3a:01:00:13:ce -> 00:d2:61:00:0f:50 IEEE 802.11
Association Request,SN=1273,FN=3[Malformed Packet]
  0.300637 00:3a:01:00:13:ce -> 00:d1:61:00:0f:50 IEEE 802.11
Association Request,SN=1273,FN=3[Malformed Packet]
  0.307266 00:00:00_ff:ff:ff -> 00:d1:ff:00:0f:80 IEEE 802.11
Association Request,SN=1273,FN=3[Malformed Packet]
  0.325237 00:3a:01:00:13:ce -> 00:d1:61:00:0f:50 IEEE 802.11
Association Request,SN=1273,FN=3[Malformed Packet]
  0.349754 00:3a:01:00:13:ce -> 00:d3:61:00:0f:50 IEEE 802.11
Association Request,SN=1273,FN=3[Malformed Packet]
  0.372783 00:00:00_ff:ff:ff -> 00:d1:ff:00:13:40 IEEE 802.11
Association Request,SN=1270,FN=15[Malformed Packet]
  0.373446 00:00:00_ff:ff:ff -> 00:cf:ff:00:13:40 IEEE 802.11
Association Request,SN=1270,FN=15[Malformed Packet]
  0.374330 00:3a:01:00:13:ce -> 00:d1:61:00:0f:50 IEEE 802.11
Association Request,SN=1273,FN=3[Malformed Packet]
  0.374647 00:00:00_00:0f:b5 -> 00:c6:c1:03:00:d4 IEEE 802.11
Association Request[Malformed Packet]
  0.409664 00:00:00_ff:ff:ff -> 00:cf:ff:00:0f:80 IEEE 802.11
Association Request,SN=1273,FN=3[Malformed Packet]
  0.512068 00:00:00_ff:ff:ff -> 00:d2:ff:00:0f:80 IEEE 802.11
Association Request,SN=1273,FN=3[Malformed Packet]
  0.614204 00:3a:01:00:13:ce -> 00:d1:61:00:0f:50 IEEE 802.11
Association Request,SN=1273,FN=3[Malformed Packet]
  0.615523 00:00:00_ff:ff:ff -> Cisco_00:0f:80 IEEE 802.11 Association
Request,SN=1273,FN=3[Malformed Packet]
  0.637865 00:3a:01:00:13:ce -> 00:d2:61:00:0f:50 IEEE 802.11
Association Request,SN=1273,FN=3[Malformed Packet]
  0.639246 08:3a:01:00:13:ce -> 00:cf:61:00:0f:50 IEEE 802.11
Association Request,SN=1273,FN=3[Malformed Packet]
  0.640599 08:3a:01:00:13:ce -> TremonEn_00:0f:50 IEEE 802.11
Association Request,SN=1273,FN=3[Malformed Packet]
  0.642884 08:3a:01:00:13:ce -> 00:d1:61:00:0f:50 IEEE 802.11
Association Request,SN=1273,FN=3[Malformed Packet]
  0.645643 08:3a:01:00:13:ce -> TremonEn_00:0f:50 IEEE 802.11
Association Request,SN=1273,FN=3[Malformed Packet]
  0.651452 08:3a:01:00:13:ce -> 00:d2:61:00:0f:50 IEEE 802.11
Association Request,SN=1273,FN=3[Malformed Packet]
  0.662399 00:3a:01:00:13:ce -> TremonEn_00:0f:50 IEEE 802.11
Association Request,SN=1273,FN=3[Malformed Packet]
35 packets captured
[root@MIPV6 ~]#
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