Linux无线ESSID:off/any的错误

我用的Distribution是SUSE，昨天上网发现无线网络突然扫描不了，在命令行下输入iwconfig wlan0

得到的结果为：

这个信息说明任何无线都无法被扫描到。

wlan0     IEEE 802.11bgn  ESSID:off/any  

           Mode:Managed  Access Point: Not-Associated   Tx-Power=0 dBm   

           Retry  long limit:7   RTS thr:off   Fragment thr:off

           Encryption key:off

           Power Management:off

查了很多资料都不知道是什么原因。

输入命令/etc/init.d/network restart

得到的结果为：

Shutting down network interfaces:

     eth0      device: Realtek Semiconductor Co., Ltd. RTL8111/8168B

               No configuration found for eth0 

               Nevertheless the interface will be shut down.          done

     wlan0     device: Atheros Communications Inc. AR9485 Wireless N  done

 Shutting down service network  .  .  .  .  .  .  .  .  .             done

 Hint: you may set mandatory devices in /etc/sysconfig/network/config

 Setting up network interfaces:

     eth0      device: Realtek Semiconductor Co., Ltd. RTL8111/8168B

               No configuration found for eth0                        unused

     wlan0     device: Atheros Communications Inc. AR9485 Wireless N

     wlan0     warning: using NO encryption

     wlan0     Starting DHCP4+DHCP6 client. . . . . . . .  

     wlan0     DHCP4 continues in background

     wlan0     DHCP6 continues in background                          waiting

 Setting up service network  .  .  .  .  .  .  .  .  .  .             done

 SuSEfirewall2: Setting up rules from /etc/sysconfig/SuSEfirewall2 ...

 SuSEfirewall2: using default zone 'ext' for interface eth0

 SuSEfirewall2: batch committing...

 SuSEfirewall2: Firewall rules successfully set

注意，上面的信息中有一个异常：wlan0     DHCP6 continues in background                          waiting

进到图形界面的“网络设置”中的“全局选项”，如下图所示：

发现图中的“启用IPv6”选项被勾起来了。把该选项前面的勾去掉，无线网络恢复可以为正常扫描。

问题解决！