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The first line of the script should be
#!/bin/bash
The ifup/down part could also be writting
ifdown eth0 && ifup eth0
Gustin Johnson wrote:
>> Is there a way. that the Linux machine can monitor the status of the
>> incoming connection from the ISP, and attempt to restore the connection
>> if it is lost? And continue to attempt to re-connect to the ISP until
>> connection is restored (sometimes, this can be hours due to weather).
>
> I have done something similar in the past. A simple shell script that
> cron runs every 5 minutes was my solution.
>
> In my shell script was a function:
>
> CheckNet ()
> {
> ping -c 1 $PINGHOST >& /dev/null ; # Checking to see if we have net
> connectivity to the backup server
> }
>
> Then based on the success or failure the script did something else. On
> a Debian or Ubuntu machine, you could restart the interface with the
> following commands:
>
> ifdown eth0
> ifup eth0
>
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