AP は設定できますが、AP のモニタ インターフェイスとチャネルを明示的に設定したにもかかわらず、AP 周波数は周期的に変化します。
私の設定：
- オペレーティングシステム：Kali Linux 1.0（USBドライブから起動）
- 外部ネットワークアダプタ：Alfa AWUS036NH（チップセットRalink RT2870/3070、ドライバ：rt2800usb）
- オンボードネットワークアダプタ：Atheros（チップセットAR9485、ドライバ：ath9k）
私が達成したいもの：
- Alfaアダプタのチャネル6で実行されるAPの生成
私がしたこと：
root@kali:~# ifconfig
eth0 Link encap:Ethernet HWaddr dc:0e:a1:28:8f:fc
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:16
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:8 errors:0 dropped:0 overruns:0 frame:0
TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:480 (480.0 B) TX bytes:480 (480.0 B)
wlan0 Link encap:Ethernet HWaddr 9c:b7:0d:04:d2:f5
inet addr:192.168.2.140 Bcast:192.168.2.255 Mask:255.255.255.0
inet6 addr: fe80::9eb7:dff:fe04:d2f5/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:105 errors:0 dropped:0 overruns:0 frame:0
TX packets:29 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:11692 (11.4 KiB) TX bytes:2834 (2.7 KiB)
wlan3 Link encap:Ethernet HWaddr 00:c0:ca:59:23:d0
inet addr:192.168.2.223 Bcast:192.168.2.255 Mask:255.255.255.0
inet6 addr: fe80::2c0:caff:fe59:23d0/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:21 errors:0 dropped:0 overruns:0 frame:0
TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1572 (1.5 KiB) TX bytes:1300 (1.2 KiB)
root@kali:~# iwconfig
eth0 no wireless extensions.
lo no wireless extensions.
wlan3 IEEE 802.11bgn ESSID:"SomeNetwork"
Mode:Managed Frequency:2.437 GHz Access Point: 0A:60:6E:EA:96:31
Bit Rate=13 Mb/s Tx-Power=20 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:on
Link Quality=70/70 Signal level=-27 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:2 Missed beacon:0
wlan0 IEEE 802.11bgn ESSID:"SomeNetwork"
Mode:Managed Frequency:2.437 GHz Access Point: 0A:60:6E:EA:96:31
Bit Rate=1 Mb/s Tx-Power=16 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
Link Quality=70/70 Signal level=-39 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:2 Invalid misc:25 Missed beacon:0
root@kali:~# ifconfig wlan3 down
root@kali:~# ifconfig
eth0 Link encap:Ethernet HWaddr dc:0e:a1:28:8f:fc
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:16
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:8 errors:0 dropped:0 overruns:0 frame:0
TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:480 (480.0 B) TX bytes:480 (480.0 B)
wlan0 Link encap:Ethernet HWaddr 9c:b7:0d:04:d2:f5
inet addr:192.168.2.140 Bcast:192.168.2.255 Mask:255.255.255.0
inet6 addr: fe80::9eb7:dff:fe04:d2f5/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:125 errors:0 dropped:0 overruns:0 frame:0
TX packets:29 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:15214 (14.8 KiB) TX bytes:2834 (2.7 KiB)
root@kali:~# iwconfig
eth0 no wireless extensions.
lo no wireless extensions.
wlan3 IEEE 802.11bgn ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=20 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:on
wlan0 IEEE 802.11bgn ESSID:"SomeNetwork"
Mode:Managed Frequency:2.437 GHz Access Point: 0A:60:6E:EA:96:31
Bit Rate=1 Mb/s Tx-Power=16 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
Link Quality=70/70 Signal level=-38 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:2 Invalid misc:25 Missed beacon:0
root@kali:~# airmon-ng check kill
Found 4 processes that could cause trouble.
If airodump-ng, aireplay-ng or airtun-ng stops working after
a short period of time, you may want to kill (some of) them!
-e
PID Name
3512 NetworkManager
3620 wpa_supplicant
3849 dhclient
4263 dhclient
Process with PID 4263 (dhclient) is running on interface wlan3
Process with PID 3849 (dhclient) is running on interface wlan0
Killing all those processes...
root@kali:~# airmon-ng check kill
root@kali:~# ifconfig
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:12 errors:0 dropped:0 overruns:0 frame:0
TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:720 (720.0 B) TX bytes:720 (720.0 B)
root@kali:~# iwconfig
eth0 no wireless extensions.
lo no wireless extensions.
wlan3 IEEE 802.11bgn ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=20 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:on
wlan0 IEEE 802.11bgn ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=16 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
root@kali:~# iwconfig wlan3 channel 6
root@kali:~# airmon-ng start wlan3 6
Interface Chipset Driver
wlan3 Ralink RT2870/3070 rt2800usb - [phy1]
(monitor mode enabled on mon0)
wlan0 Atheros AR9485 ath9k - [phy0]
root@kali:~# airbase-ng -c 6 -e FreeWiFi mon0
15:04:22 Created tap interface at0
15:04:22 Trying to set MTU on at0 to 1500
15:04:22 Trying to set MTU on mon0 to 1800
15:04:22 Access Point with BSSID 00:C0:CA:59:23:D0 started.
別のターミナルウィンドウでmon0でairodum-ngを実行すると、チャネルホッピングが発生することがわかります（CH値xが変更され続けます）。
BSSID PWR Beacons #Data, #/s CH MB ENC CIPHER AUTH ESSID
00:C0:CA:59:23:D0 0 2969 0 0 x 54 OPN FreeWiFi
at0 インタフェースが設定されておらず、dhcp サービスが実行されていませんが、この段階ではそれが重要ではないと思います。
他のAndroidデバイスでWiFiアナライザアプリを起動しましたが、このアプリで私の不良AP「FreeWiFi」が実際にチャンネルホッピングをしていることを確認しました。
質問：
1)wlan3、mon0、APチャンネルを6に設定しましたが、なぜチャンネルジャンプが発生するのですか？
2）APが固定チャネルで動作するようにするにはどうすればよいですか？
この動作を分析するために追加情報が必要な場合はお知らせください。