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Watchdog: Restarting WiFi on OpenWRT if the Link Goes Away
I put my WRT54G into a noisy electrical environment, and it seems to cause the wifi to fade out a couple times a week, sometimes permanently. (I did this after using a USB adapter on Windows proved too unstable.)
After some experimentation, this script below seems to do a reasonable job of keeping it up. Save it, and put it into the crontab. (You have to install the crond package.) The gateway is at 192.168.1.254.
#! /bin/sh # Checks if the wifi conn is up. If not, it tries to restart # the wifi. If that fails, then reboot. if ping -c 1 192.168.1.254 > /dev/null then echo nothing > /dev/null else ifdown wifi ifup wifi killall wifi wifi /etc/init.d/S41wpa sleep 30 if ping -c 192.168.1.254 > /dev/null then echo nothing > /dev/null else date >> /reboot.log reboot fi fi
(Note that the date in reboot log will be the same, because the clock is not set right after booting.)