我已经摆弄 WPA 请求者好几天了，我终于到了在谷歌上找不到任何新线索的地步。所以问题是：我刚刚在运行 debian wheezy 的台式电脑上安装了新的 tp-link tl-wn881nd pci-e wifi 卡。wlan0声称已连接（是吗？见下文）到接入点，ifconfig报告我分配给它的正确静态 IP 地址，但是我无法 ping 接入点并syslog表示握手有错误。
首先，我读过network-manager可能会弄乱事情的内容。我相当确定这对我来说不是问题：
$ which NetworkManager
##### blank #####
$ dpkg -l | grep -i network-manager
rc network-manager 0.9.4.0-10 amd-64 network management framework (daemon and userspace tools)
ii network-manager-openvpn 0.9.4.0-1 amd-64 network management framework (OpenVPN plugin core)
我的电脑规格是：
$ uname -a
Linux mypc 3.2.0-4-amd64 #1 SMP Debian 3.2.60-1+deb7u3 x86_64 GNU/Linux
$ sudo dmidecode | grep -iA3 '^system information'
System Information
Manufacturer: Dell Inc.
Product Name: OptiPlex 745
Version: Not Specified
无线网卡规格为：
$ lspci | grep -i wireless
02:00.0 Network controller: Atheros Communications Inc. AR9287 Wireless Network Adapter (PCI-Express) (rev 01)
我已确保 wifi 卡处于活动状态：
$ sudo ip link set wlan0 up
$ sudo ip link show wlan0
3: wlan0: <NO-CARRIER,BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisk mq state DORMANT mode DORMANT qlen 1000
link/ether xx:xx:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff
并且该卡能够找到我的 ssid：
$ sudo iw wlan0 scan
BSS xx:xx:xx:xx:xx:xx (on wlan0) -- associated
TSF: 2639667559 ysec (0d, 00:43:59)
freq:2412
beacon interval: 100
capability: ESS Privacy ShortSlotTime (0x0411)
signal: -56.00 dBm
last seen: 692 ms ago
Information elements from Probe Response frame:
SSID: aphanumeric_with_underscores
Supported rates: 1.0* 2.0* 5.5* 11.0* 9.0 18.0 36.0 54.0
DS Parameter set: channel 1
ERP: Use_Protection Barker_Preamble_Mode
Extended supported rates: 6.0 12.0 24.0 48.0
HT capabilities:
Capabilities: 0x106e
HT20/HT40
SM Power Save disabled
RX HT20 SGI
RX HT40 SGI
No RX STBC
Max AMSDU length: 3839 bytes
DSSS/CCK HT40
Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
Minimum RX AMPDU time spacing: 4 usec (0x05)
HT RX MCS rate indexes supported: 0-7, 32
HT TX MCS rate indexes are undefined
HT operation:
* primary channel: 1
* secondary channel offset: no secondary
* STA channel width 20MHz
* RIFS: 0
* HT protection: non-HT mixed
* non-GF present: 1
* OBSS non-GF present: 0
* dual beacon: 0
* dual CTS protection: 0
* STBC beacon: 0
* L-SIG TXOP Prot: 0
* PCO active: 0
* PCO phase: 0
RSN:* Version: 1
* Group cipher: CCMP
* Pairwise ciphers: CCMP
* Authentication suites: PSK
* Capabilities: (0x0000)
WMM:* Parameter version 1
* BE: CW 15-1023, AIFSN 3
* BK: CW 15-1023, AIFSN 7
* VI: CW 7-15, AIFSN 2, TXOP 3008 usec
* VO: CW 3-7, AIFSN 2, TXOP 1504 usec
Extended capabilities: HT Information Exchange Supported
Country: AL Environment: Indoor/Outdoor
Channels [1 - 13] @ 15 dBm
我在某处读您可以直接将 wpa_supplicant 选项放入 中/etc/network/interfaces，所以这是我的：
$ cat /etc/network/interfaces
auto lo
iface lo inet loopback
# don't use `auto wlan0` since this will infinitely try to connect at
# boot time, and i will have to remove the hard drive, mount it on
# another pc and remove `auto wlan0` from this file just to get a
# command prompt again!
iface wlan0 inet static
wpa-ssid "aphanumeric_with_underscores"
wpa-psk "my wpa2 password"
wpa-ap-scan 1
wpa-proto WPA2
wpa-pairwise CCMP
wpa-group CCMP
wpa-key-mgmt WPA-PSK
address 192.168.1.50
netmask 255.255.255.0
gateway 192.168.1.1
dns-nameservers 8.8.8.8 8.8.4.4
并注意当前没有wpa_supplicant.conf文件：
$ ls /etc/wpa_supplicant.conf
ls: cannot access /etc/wpa_supplicant.conf: No such file or directory
$ ls /etc/wpa_supplicant/*
action_wpa.sh functions.sh ifupdown.sh
现在如果重新启动wlan0界面：
$ sudo ifdown wlan0
$ sudo ifup wlan0
IP地址已被正确分配：
$ ifconfig
lo ...
wlan0 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr 192.168.1.50 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::16cc:20ff:feea:4578/64 Scope:Link
UP BROADCAST MULTICAST NTU:1500 Metric:1
RX packets:3075 errors:0 dropped:0 overruns:0 frame:0
TX packets:4028 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:347475 (339.3KiB) TX bytes:586219 (572.4KiB)
但问题是：wlan0接口似乎已启动，但我无法访问互联网，甚至无法 ping 通接入点：
$ ping 192.168.1.1
PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
From 192.168.1.50 icmp_seq=2 Destination Host Unreachable
From 192.168.1.50 icmp_seq=3 Destination Host Unreachable
^C
--- 192.168.1.1 ping statistics ---
3 packets transmitted, 0 received, +2 errors, 100% packet loss, time 2015ms
当我查看时，/var/log/syslog我看到一些令人讨厌的错误：
Mar 18 01:23:11 mypc kernel: [ 148.242137] wlan0: authenticate with xx.xx.xx.xx.xx.xx (try 1)
Mar 18 01:23:11 mypc kernel: [ 148.244009] wlan0: authenticated
Mar 18 01:23:11 mypc kernel: [ 148.265967] wlan0: associate with xx.xx.xx.xx.xx.xx (try 1)
Mar 18 01:23:11 mypc kernel: [ 148.287770] wlan0: RX AssocResp from xx.xx.xx.xx.xx.xx (capab=0x411 status=0 aid=1)
Mar 18 01:23:11 mypc kernel: [ 148.287774] wlan0: associated
Mar 18 01:23:11 mypc kernel: [ 148.287774] wlan0: associated
Mar 18 01:23:11 mypc wpa_supplicant[4473]: wlan0: Associated with xx.xx.xx.xx.xx.xx
Mar 18 01:23:11 mypc kernel: [ 148.297421] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
Mar 18 01:23:11 mypc kernel: [ 148.297651] cfg80211: Calling CRDA for country AL
Mar 18 01:23:11 mypc kernel: [ 148.303008] cfg80211: Regulatory domain changed to country: AL
Mar 18 01:23:11 mypc kernel: [ 148.303013] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
Mar 18 01:23:11 mypc kernel: [ 148.303018] cfg80211: (2402000 KHz - 2482000 KHz @ 40000 KHz), (N/A, 2000 mBm)
Mar 18 01:23:11 mypc kernel: [ 148.303022] cfg80211: (5170000 KHz - 5250000 KHz @ 80000 KHz), (N/A, 2000 mBm)
Mar 18 01:23:11 mypc kernel: [ 148.303026] cfg80211: (5250000 KHz - 5330000 KHz @ 80000 KHz), (N/A, 2000 mBm)
Mar 18 01:23:11 mypc kernel: [ 148.303029] cfg80211: (5490000 KHz - 5710000 KHz @ 80000 KHz), (N/A, 2700 mBm)
Mar 18 01:23:19 mypc kernel: [ 155.819739] wlan0: deauthenticated from xx:xx:xx:xx:xx:xx (Reason: 15)
Mar 18 01:23:19 mypc wpa_supplicant[4473]: wlan0: WPA: 4-Way Handshake failed - pre-shared key may be incorrect
Mar 18 01:23:19 mypc wpa_supplicant[4473]: wlan0: CTRL-EVENT-DISCONNECTED bssid=xx:xx:xx:xx:xx:xx reason=15
有人知道我如何解决这个问题并通过 ping 我的接入点wlan0吗？
修改1：尝试使用dhcp代替静态ip
我/etc/network/interfaces像这样改变：
$ cat /etc/network/interfaces
auto lo
iface lo inet loopback
# don't use `auto wlan0` since this will infinitely try to connect at
# boot time, and i will have to remove the hard drive, mount it on
# another pc and remove `auto wlan0` from this file just to get a
# command prompt again!
iface wlan0 inet dhcp
wpa-ssid "aphanumeric_with_underscores"
wpa-psk "my wpa2 password"
wpa-ap-scan 1
wpa-proto WPA2
wpa-pairwise CCMP
wpa-group CCMP
wpa-key-mgmt WPA-PSK
（请注意，wpa_supplicant.conf修改 1 中仍然不存在），现在当我启动界面时，我在命令行上收到一些新错误：
$ sudo ifup wlan0
Operation failed.
Failed to bring up wlan0
系统日志和以前一样一遍又一遍地显示相同的失败消息：
Mar 18 08:59:01 mypc kernel: [ 2493.163777] ADDRCONF(NETDEV_UP): wlan0: link is not ready
Mar 18 08:59:02 mypc wpa_supplicant[6151]: wlan0: SME: Trying to authenticate with xx:xx:xx:xx:xx:xx (SSID='alphanumeric_with_underscores' freq=2412 MHz)
Mar 18 08:59:02 mypc kernel: [ 2493.974111] wlan0: authenticate with xx:xx:xx:xx:xx:xx (try 1)
Mar 18 08:59:02 mypc kernel: [ 2493.976083] wlan0: authenticated
Mar 18 08:59:02 mypc wpa_supplicant[6151]: wlan0: Trying to associate with xx:xx:xx:xx:xx:xx (SSID='aphanumeric_with_underscores' freq=2412 MHz)
Mar 18 08:59:02 mypc kernel: [ 2493.998016] wlan0: associate with xx:xx:xx:xx:xx:xx (try 1)
Mar 18 08:59:02 mypc kernel: [ 2494.019518] wlan0: RX ReassocResp from xx:xx:xx:xx:xx:xx (capab=0x411 status=0 aid=2)
Mar 18 08:59:02 mypc kernel: [ 2494.019523] wlan0: associated
Mar 18 08:59:02 mypc wpa_supplicant[6151]: wlan0: Associated with xx:xx:xx:xx:xx:xx
Mar 18 08:59:02 mypc kernel: [ 2494.028721] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
Mar 18 08:59:02 mypc kernel: [ 2494.028873] cfg80211: Calling CRDA for country: AL
Mar 18 08:59:02 mypc kernel: [ 2494.033830] cfg80211: Regulatory domain changed to country: AL
Mar 18 08:59:02 mypc kernel: [ 2494.033835] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
Mar 18 08:59:02 mypc kernel: [ 2494.033839] cfg80211: (2402000 KHz - 2482000 KHz @ 40000 KHz), (N/A, 2000 mBm)
Mar 18 08:59:02 mypc kernel: [ 2494.033843] cfg80211: (5170000 KHz - 5250000 KHz @ 80000 KHz), (N/A, 2000 mBm)
Mar 18 08:59:02 mypc kernel: [ 2494.033846] cfg80211: (5250000 KHz - 5330000 KHz @ 80000 KHz), (N/A, 2000 mBm)
Mar 18 08:59:02 mypc kernel: [ 2494.033849] cfg80211: (5490000 KHz - 5710000 KHz @ 80000 KHz), (N/A, 2700 mBm)
Mar 18 08:59:09 mypc kernel: [ 2501.499716] wlan0: deauthenticated from xx:xx:xx:xx:xx:xx (Reason: 15)
Mar 18 08:59:09 mypc wpa_supplicant[6151]: wlan0: WPA: 4-Way Handshake failed - pre-shared key may be incorrect
Mar 18 08:59:09 mypc wpa_supplicant[6151]: wlan0: CTRL-EVENT-DISCONNECTED bssid=xx:xx:xx:xx:xx:xx reason=15
Mar 18 08:59:09 mypc kernel: [ 2501.536289] cfg80211: Calling CRDA to update world regulatory domain
Mar 18 08:59:09 mypc kernel: [ 2501.541764] cfg80211: World regulatory domain updated:
Mar 18 08:59:09 mypc kernel: [ 2501.541770] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
Mar 18 08:59:09 mypc kernel: [ 2501.541775] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (N/A, 2000 mBm)
Mar 18 08:59:09 mypc kernel: [ 2501.541779] cfg80211: (2457000 KHz - 2482000 KHz @ 40000 KHz), (N/A, 2000 mBm)
Mar 18 08:59:09 mypc kernel: [ 2501.541782] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (N/A, 2000 mBm)
Mar 18 08:59:09 mypc kernel: [ 2501.541786] cfg80211: (5170000 KHz - 5250000 KHz @ 80000 KHz), (N/A, 2000 mBm)
Mar 18 08:59:09 mypc kernel: [ 2501.541790] cfg80211: (5735000 KHz - 5835000 KHz @ 80000 KHz), (N/A, 2000 mBm)
Mar 18 08:59:09 mypc kernel: [ 2501.541794] cfg80211: (57240000 KHz - 63720000 KHz @ 2160000 KHz), (N/A, 0 mBm)
Mar 18 08:59:10 mypc wpa_supplicant[6151]: wlan0: SME: Trying to authenticate with xx:xx:xx:xx:xx:xx (SSID='aphanumeric_with_underscores' freq=2412 MHz)
Mar 18 08:59:10 mypc kernel: [ 2502.434112] wlan0: authenticate with xx:xx:xx:xx:xx:xx (try 1)
Mar 18 08:59:10 mypc kernel: [ 2502.436071] wlan0: authenticated
etc
请注意，eth0 与 dhcp 配合良好，因此 dhcp 本身没有问题。
修改 2：尝试使用 wpa_passphrase 中的 psk 哈希
$ wpa_passphrase myssid mypassword
network={
ssid="myssid"
#psk="mypassword"
psk=xxxxxxxxxxxx...
}
在以下位置使用这个新的 psk /etc/network/interfaces：
$ cat /etc/network/interfaces
auto lo
iface lo inet loopback
# don't use `auto wlan0` since this will infinitely try to connect at
# boot time, and i will have to remove the hard drive, mount it on
# another pc and remove `auto wlan0` from this file just to get a
# command prompt again!
iface wlan0 inet dhcp
wpa-ssid "aphanumeric_with_underscores"
wpa-psk xxxxxxxxxxxxxxxx
wpa-ap-scan 1
wpa-proto WPA2
wpa-pairwise CCMP
wpa-group CCMP
wpa-key-mgmt WPA-PSK
再试一次：
$ sudo iplink set wlan0 down
$ sudo iplink set wlan0 up
$ sudo ifup wlan0
cat: /var/run/wpa_supplicant.wlan0.pid: No such file or directory
Operation failed.
Failed to bring up wlan0.
嗯，那次有趣的错误。调查：
$ sudo su
# cd /var/run/wpa_supplicant/
# ls -l
total 0
srwxrwx--- 1 root root 0 Mar 18 09:26 wlan0
# cat wlan0
cat: wlan0: No such device or address
/var/log/syslog但仍然显示相同的错误。
修改3：设置一个非常基本的ssid和密码
我将 ssid 设置为abc并将密码设置为abcdefgh：
$ wpa_passphrase abc abcdefgh
network={
ssid="abc"
#psk="abcdefgh"
psk=ba89407e92b8efec11c227e3cce9f25c8dcc4b3651fe2be02d91d9ebda96e913
}
但无论我输入哪一个预共享密钥，结果都与修改 1 和修改 2 相同/etc/network/interfaces
$ sudo ip link set wlan0 down
$ sudo ip link set wlan0 up
$ sudo ip link show wlan0
3: wlan0: <NO-CARRIER,BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state DORMANT mode DEFAULT qlen 1000
link/ether xx:xx:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff
$ sudo ifdown wlan0
ifdown: interface wlan0 not configured
$ sudo rm /var/run/wpa_supplicant/wlan0
$ sudo ifup wlan0
wpa_supplicant: ctrl_interface socket not found at /var/run/wpa_supplicant/wlan0
run-parts: /etc/network/if-pre-up.d/wpasupplicant exited with return code 1
Operation failed.
Failed to bring up wlan0.
修改4：在命令行调试模式下使用wpa_supplicant
从以下位置删除所有 wpa 设置/etc/network/interfaces：
$ cat /etc/network/interfaces
auto lo
iface lo inet loopback
iface wlan0 inet dhcp
现在创建wpa_supplicant.conf文件：
$ sudo sh -c 'wpa_passphrase abc abcdefgh > /etc/wpa_supplicant/wpa_supplicant.conf'
编辑该文件以包含以下信息：
ap_scan=1
ctrl_interface=DIR=/var/run/wpa_supplicant
ctrl_interface_group=0
network={
proto=WPA2
pairwise=CCMP
group=CCMP
key_mgmt=WPA-PSK
ssid="abc"
#psk="abcdefgh"
psk=ba89407e92b8efec11c227e3cce9f25c8dcc4b3651fe2be02d91d9ebda96e913
}
直接运行wpa_supplicant：
$ sudo ip link show wlan0
3: wlan0: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN mode DEFAULT qlen 1000
link/ether xx:xx:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff
$ sudo ip link set wlan0 up
$ sudo wpa_supplicant -i wlan0 -c /etc/wpa_supplicant/wpa_supplicant.conf
ioctl[SIOCSIWENCODEEXT]: Invalid argument
ioctl[SIOCSIWENCODEEXT]: Invalid argument
wlan0: Trying to associate with xx:xx:xx:xx:xx:xx (SSID='abc' freq=2412 MHz)
wlan0: Associated with 00:00:00:00:00:00
wlan0: CTRL-EVENT-DISCONNECTED bssid=xx:xx:xx:xx:xx:xx reason=0
ioctl[SIOCSIWENCODEEXT]: Invalid argument
ioctl[SIOCSIWENCODEEXT]: Invalid argument
wlan0: Trying to associate with xx:xx:xx:xx:xx:xx (SSID='abc' freq=2412 MHz)
wlan0: Associated with 00:00:00:00:00:00
wlan0: CTRL-EVENT-DISCONNECTED bssid=xx:xx:xx:xx:xx:xx reason=0
ioctl[SIOCSIWENCODEEXT]: Invalid argument
ioctl[SIOCSIWENCODEEXT]: Invalid argument
ioctl[SIOCSIWSCAN]: Device or resource busy
wlan0: Failed to initiate AP scan
wlan0: Trying to associate with xx:xx:xx:xx:xx:xx (SSID='abc' freq=2412 MHz)
wlan0: Associated with 00:00:00:00:00:00
wlan0: CTRL-EVENT-DISCONNECTED bssid=xx:xx:xx:xx:xx:xx reason=0
ioctl[SIOCSIWENCODEEXT]: Invalid argument
ioctl[SIOCSIWENCODEEXT]: Invalid argument
^Cwlan0: CTRL-EVENT-TERMINATING - signal 2 received
再次，详细一点调试：
$ sudo wpa_supplicant -d -i wlan0 -c /etc/wpa_supplicant/wpa_supplicant.conf -f /tmp/wpa_supplicant.tl-wn881nd.errors
查看输出这里。
看来ioctl[SIOCSIWENCODEEXT]: Invalid argumentwifi卡和内核之间可能不兼容？如果是这样，我该如何诊断和解决这个问题？
答案1
该死的 wifi 卡没有正确插入 pci-express 插槽！我把它拿出来，吹掉插槽上的灰尘，然后这次用力把它推了进去。现在一切正常：
# the wifi led is not lit up on the outside of the pc case
$ sudo ip link show wlan0
3: wlan0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT qlen 1000
link/ether xx:xx:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff
$ sudo ip link set wlan0 up
# now the wifi led is lit up on the outside of the pc case
$ sudo ip link show wlan0
3: wlan0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN mode DEFAULT qlen 1000
link/ether xx:xx:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff
$ sudo wpa_supplicant -i wlan0 -c /etc/wpa_supplicant/wpa_supplicant.conf
ioctl[SIOCSIWENCODEEXT]: Invalid argument
ioctl[SIOCSIWENCODEEXT]: Invalid argument
wlan0: Trying to associate with 00:60:64:4c:37:fc (SSID='abc' freq=2412 MHz)
wlan0: Associated with 00:60:64:4c:37:fc
wlan0: WPA: Key negotiation completed with 00:60:64:4c:37:fc [PTK=CCMP GTK=CCMP]
wlan0: CTRL-EVENT-CONNECTED - Connection to 00:60:64:4c:37:fc completed (auth) [id=0 id_str=]
wlan0: CTRL-EVENT-DISCONNECTED bssid=00:60:64:4c:37:fc reason=0
ioctl[SIOCSIWENCODEEXT]: Invalid argument
ioctl[SIOCSIWENCODEEXT]: Invalid argument
wlan0: Trying to associate with 00:60:64:4c:37:fc (SSID='abc' freq=2412 MHz)
wlan0: Associated with 00:60:64:4c:37:fc
wlan0: WPA: Key negotiation completed with 00:60:64:4c:37:fc [PTK=CCMP GTK=CCMP]
wlan0: CTRL-EVENT-CONNECTED - Connection to 00:60:64:4c:37:fc completed (reauth) [id=0 id_str=]
$ ping 192.168.1.1
PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
64 bytes from 192.168.1.1: icmp_req=1 ttl=254 time=0.510 ms
64 bytes from 192.168.1.1: icmp_req=2 ttl=254 time=0.578 ms
^C
--- 192.168.1.1 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 999ms
rtt min/avg/max/mdev = 0.510/0.544/0.578/0.034 ms
正确的/var/log/syslog看起来像这样：
Mar 18 13:38:19 mypc kernel: [ 542.538613] wlan0: authenticate with 00:60:64:4c:37:fc (try 1)
Mar 18 13:38:19 mypc kernel: [ 542.540517] wlan0: authenticated
Mar 18 13:38:19 mypc kernel: [ 542.540553] wlan0: associate with 00:60:64:4c:37:fc (try 1)
Mar 18 13:38:19 mypc kernel: [ 542.563331] wlan0: RX AssocResp from 00:60:64:4c:37:fc (capab=0x411 status=0 aid=3)
Mar 18 13:38:19 mypc kernel: [ 542.563336] wlan0: associated
Mar 18 13:38:19 mypc kernel: [ 542.573034] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
Mar 18 13:38:19 mypc kernel: [ 542.573220] cfg80211: Calling CRDA for country: AL
Mar 18 13:38:19 mypc kernel: [ 542.578955] cfg80211: Regulatory domain changed to country: AL
Mar 18 13:38:19 mypc kernel: [ 542.578960] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
Mar 18 13:38:19 mypc kernel: [ 542.578965] cfg80211: (2402000 KHz - 2482000 KHz @ 40000 KHz), (N/A, 2000 mBm)
Mar 18 13:38:19 mypc kernel: [ 542.578969] cfg80211: (5170000 KHz - 5250000 KHz @ 80000 KHz), (N/A, 2000 mBm)
Mar 18 13:38:19 mypc kernel: [ 542.578972] cfg80211: (5250000 KHz - 5330000 KHz @ 80000 KHz), (N/A, 2000 mBm)
Mar 18 13:38:19 mypc kernel: [ 542.578976] cfg80211: (5490000 KHz - 5710000 KHz @ 80000 KHz), (N/A, 2700 mBm)
这些行只出现一次 - 它们不再一遍又一遍地重复syslog
:)
wpa_supplicant.conf请注意，如果我删除文件并将所有内容放入其中，它现在也可以正常工作/etc/network/interfaces：
$ cat /etc/network/interfaces
auto lo
iface lo inet loopback
# don't use `auto wlan0` since this will infinitely try to connect at
# boot time, and i will have to remove the hard drive, mount it on
# another pc and remove `auto wlan0` from this file just to get a
# command prompt again!
iface wlan0 inet static
wpa-ssid "aphanumeric_with_underscores"
# both the plaintext password and the ascii-hex hash from
# wpa_passphrase work fine for me here:
wpa-psk "my wpa2 password"
wpa-ap-scan 1
wpa-proto WPA2
wpa-pairwise CCMP
wpa-group CCMP
wpa-key-mgmt WPA-PSK
address 192.168.1.50
netmask 255.255.255.0
gateway 192.168.1.1
dns-nameservers 8.8.8.8 8.8.4.4
and note that there is currently no wpa_supplicant.conf file:
$ ls /etc/wpa_supplicant.conf
ls: cannot access /etc/wpa_supplicant.conf: No such file or directory
$ ls /etc/wpa_supplicant/*
action_wpa.sh functions.sh ifupdown.sh
答案2
我会尝试根据以下内容使用 wpa_supplicantUbuntu 用户维基。
这意味着：将所有 wpa 内容放入/etc/wpa_supplicant/wpa_supplicant.conf并修改/etc/network/interfaces为仅包含
...
auto wlan0
iface wlan0 inet dhcp
wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf
...
进一步手动启动wpa_supplicant ( wpa_supplicant -c /etc/wpa_supplicant/wpa_supplicant.conf -d)。如果 wpa_supplicant 有问题，应该会显示出来。
编辑：我进一步同意@casey的观点，密钥中可能存在一些错误