Linux 的 Wifi 斷線自動連線 Script

Linux 在 Xwindow 開著電腦，有時候 Wifi 會自動斷線，要怎麼自動重新連線？

Linux 的 Wifi 斷線自動連線 Script

一般 Wifi 斷線，最常見的就是網卡進入省電模式，然後另一個就是靠程式自動做重新連線了~

讓 Wifi 網卡不進入省電模式

1. cat /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf
   • 預設值 3
   • NetworkManager supports WiFi powersaving but the function is rather undocumented.
   • From the source code: wifi.powersave can have the following value:
   • NM_SETTING_WIRELESS_POWERSAVE_DEFAULT (0): use the default value
   • NM_SETTING_WIRELESS_POWERSAVE_IGNORE (1): don't touch existing setting
   • NM_SETTING_WIRELESS_POWERSAVE_DISABLE (2): disable powersave
   • NM_SETTING_WIRELESS_POWERSAVE_ENABLE (3): enable powersave
2. vim /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf
   • 將 wifi.powersave = 3
   • 改成 wifi.powersave = 2
3. 這樣子就完成

寫自動重新連線的 Script

註：下述程式的兩個 wlan0，請自行換成 Wifi 網卡的代號

1. vim wifi-reconnct.sh

   #!/bin/bash
   while true
   do
       i=$(cat /sys/class/net/wlan0/carrier)
       if test "$i" = 1
       then
           true
           # echo `date` " connected"
       else
           echo `date` " reconnecting"
           nmcli c down WIFI-AP-SSID
           nmcli c up WIFI-AP-SSID
           # systemctl restart networking.service
           # dhclient wlan0
           echo `date` " reconnected successfully"
       fi
   sleep 2
   done
   

2. chmod +x ./wifi-reconnect.sh
3. 有需要就將此程式加入 Cron 或 SystemCtl 進入背景執行

註：最後主要是靠後面這 Script 自動連線解決~