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【已解决】iwlist scan或iwlist scanning的输出结果不稳定/return no Access Point/No scan results

Wireless crifan 3881浏览 0评论

【已解决】iwlist scan或iwlist scanning的输出结果不稳定/return no Access Point/No scan results

【问题】
去尝试iwlist的使用,发现iwlist scan输出的结果,不稳定,或者说,很多时候输出的结果都不太一样。
主要表现为,有时候可以正常搜索出来很多无线网络的详细信息,有时候只能找到当前有效的那单个无线网络,而有时候完全都找不到一个有效的无线网络:
crifan@crifan-laptop:~/download$ iwlist scanning
lo        Interface doesn’t support scanning.

eth0      Interface doesn’t support scanning.

wlan0     Scan completed :
          Cell 01 – Address: D8:5D:4C:76:B5:D8
                    ESSID:”TP-LINK_76B5D8″
                    Protocol:IEEE802.11bg
                    Mode:Master
                    Channel:1
                    Encryption key:on
                    Bit Rates:54 Mb/s
                    Extra: Rates (Mb/s): 1 2 5.5 9 11 6 12 18 24 36 48 54
                    Quality:42  Signal level:0  Noise level:165
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : CCMP
                        Pairwise Ciphers (1) : CCMP
                        Authentication Suites (1) : PSK
                       Preauthentication Supported
                    Extra: Last beacon: 220ms ago
。。。。。。。。。。。。。。。。。。
。。。。。。。。。。。。。。。。。。
。。。。。。。。。。。。。。。。。。
          Cell 22 – Address: 00:23:CD:97:31:44
                    ESSID:”ECO-5#401″
                    Protocol:IEEE802.11bg
                    Mode:Master
                    Channel:12
                    Encryption key:on
                    Bit Rates:54 Mb/s
                    Extra: Rates (Mb/s): 1 2 5.5 9 11 6 12 18 24 36 48 54
                    Quality:42  Signal level:0  Noise level:165
                    IE: WPA Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : TKIP CCMP
                        Authentication Suites (1) : PSK
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : TKIP CCMP
                        Authentication Suites (1) : PSK
                       Preauthentication Supported
                    Extra: Last beacon: 1860ms ago

crifan@crifan-laptop:~/download$ iwlist scanning
lo        Interface doesn’t support scanning.

eth0      Interface doesn’t support scanning.

wlan0     Scan completed :
          Cell 01 – Address: D8:5D:4C:47:E6:B4
                    ESSID:”TP-LINK_noDailUp”
                    Protocol:IEEE802.11bg
                    Mode:Master
                    Channel:5
                    Encryption key:off
                    Bit Rates:54 Mb/s
                    Extra: Rates (Mb/s): 1 2 5.5 9 11 6 12 18 24 36 48 54
                    Quality:93  Signal level:0  Noise level:140
                    Extra: Last beacon: 1849ms ago

crifan@crifan-laptop:~/download$ iwlist scanning
lo        Interface doesn’t support scanning.

eth0      Interface doesn’t support scanning.

wlan0     No scan results

后来,去网上找原因,看到这里的解释:
http://linuxcommand.org/man_pages/iwlist8.html
“       scan[ning]
             。。。
              Triggering  scanning  is  a privileged operation (root only) and
              normal users can only read left-over scan results.  。。。”
即,使用iwlist scan[ning]的时候,是需要超级用户的权限的,所以去尝试用sudo执行,就可以正常地,每次都可以找到无线网络了:
crifan@crifan-laptop:~/download$ sudo iwlist scanning
lo        Interface doesn’t support scanning.

eth0      Interface doesn’t support scanning.

wlan0     Scan completed :
          Cell 01 – Address: 94:0C:6D:D7:89:62
                    ESSID:”TP”
                    Protocol:IEEE802.11bg
                    Mode:Master
                    Channel:1
                    Encryption key:on
                    Bit Rates:54 Mb/s
                    Extra: Rates (Mb/s): 1 2 5.5 9 11 6 12 18 24 36 48 54
                    Quality:42  Signal level:0  Noise level:165
                    IE: WPA Version 1
                        Group Cipher : CCMP
                        Pairwise Ciphers (1) : CCMP
                        Authentication Suites (1) : PSK
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : CCMP
                        Pairwise Ciphers (1) : CCMP
                        Authentication Suites (1) : PSK
                       Preauthentication Supported
                    Extra: Last beacon: 179ms ago
          Cell 02 – Address: D8:5D:4C:47:E6:B4
                    ESSID:”TP-LINK_noDailUp”
                    Protocol:IEEE802.11bg
                    Mode:Master
                    Channel:5
                    Encryption key:off
                    Bit Rates:54 Mb/s
                    Extra: Rates (Mb/s): 1 2 5.5 9 11 6 12 18 24 36 48 54
                    Quality:90  Signal level:0  Noise level:141
                    Extra: Last beacon: 94ms ago
。。。。。。。。。。。。。。
          Cell 26 – Address: 1C:BD:B9:B3:67:2A
                    ESSID:”chome”
                    Protocol:IEEE802.11N-24G
                    Mode:Master
                    Channel:13
                    Encryption key:on
                    Bit Rates:300 Mb/s
                    Extra: Rates (Mb/s): 1 2 5.5 11 6 9 12 18 24 36 48 54
                    Quality:42  Signal level:0  Noise level:165
                    IE: WPA Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : TKIP CCMP
                        Authentication Suites (1) : PSK
                    IE: Unknown: DD0E0050F204104A0001101044000102
                    Extra: Last beacon: 7ms ago
          Cell 27 – Address: 00:1B:11:A6:CE:CC
                    ESSID:”dlink-sophia”
                    Protocol:IEEE802.11bg
                    Mode:Master
                    Channel:6
                    Encryption key:on
                    Bit Rates:54 Mb/s
                    Extra: Rates (Mb/s): 1 2 5.5 6 9 11 12 48 18 24 36 54
                    Quality:42  Signal level:0  Noise level:165
                    IE: WPA Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : TKIP CCMP
                        Authentication Suites (1) : PSK
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : TKIP CCMP
                        Authentication Suites (1) : PSK
                    Extra: Last beacon: 104ms ago

【总结】
1.使用iwlist scan或iwlist scanning的时候,需要加上sudo,即超级用户/root用户的权限去执行:sudo iwlist scan[ning]
2.遇到命令使用有问题的,首先要想到去man一下,此处即 man iwlist去看看其使用说明,常见注意事项,应该都可以找到解释的。

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