Wifi connection monitor / restart if not active

benoitcsirois · 01-11-2008, 11:04 PM

Hi, I am running a home server.. just for fun, and the Wifi connection is not so stable so when I get to work and try to login my "box", it's usually offline. (I know it's offline because iwconfig no longer shows that it's connected)

When I get disconnected, I just need to:

Code:

/etc/init.d/networking restart

What simple piece of software can monitor my connection and run that command if it disconnects again? Can it monitor iwconfig?

Thanks!

-Ben

tredegar · 01-12-2008, 04:11 AM

You could set up a cron job that would ping your router every 5mins or so. If it doesn't receive a reply, then it should call /etc/init.d/networking restart

Hint: Look at the outputs of

Code:

ping -c1 IP.OF.YOUR.ROUTER | grep "0 received"

when your router is connecting and

Code:

ping -c1 IP.NOTON.YOUR.NETWORK | grep "0 received"

One returns nothing, the other some text. So you could do a test on the result, and then call /etc/init.d/networking restart if needed.

Have fun, and Welcome to LQ!

benoitcsirois · 01-12-2008, 08:24 PM

Well I suck at scripting, but while browsing around, I found a short script that tests the connection with google (using ping)... i just modified it a bit for my own purpose. Here it is in case it can help anyone else:

I called it /sbin/pingtest.sh

Code:

ping -c 1 -w 5 "google.com" &>/dev/null
if [ $? -ne 0 ] ; then
    /etc/init.d/networking restart
fi

And I placed an entry in crontab that launches this script every 2 minutes.

I would prefer a small script that actually checks whether or not the Wifi card has established a connection but that's more of a pain in the butt, so this does it for now.

Peace!

Electro · 01-12-2008, 11:50 PM

Use ifplugd.