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Full Discussion: Linux: Writing a tricky script to check connectivity
Top Forums Shell Programming and Scripting Linux: Writing a tricky script to check connectivity Post 302283621 by kungfujoe on Tuesday 3rd of February 2009 04:34:15 PM
Old 02-03-2009
Linux: Writing a tricky script to check connectivity
So, first and foremost, I'm having issues with my internet connection. Periodically, the connection drops across the network. The fix is simple enough: restart the modem. However, this gets old when the connection dies out every hour.

I can hit my surfboard on 192.168.100.1, and navigate to a page allowing me to reset the modem remotely (which is nice). I also know I can do this via the command line using telnet, and (I think) SSHing into it, and sending it the command 'reset'.

So, I'd like to create a script that (every 5 minutes or so) pings Comcast.net Home. If it gets a response, great, do nothing, and check again in 5 minutes.
If it doesn't, I want my computer to automatically SSH into the modem, and reset it.


I'm a programmer, but I generally bounce around with Java. Scripting is bizarre, but somewhat familiar. I know that I need the script to (generally)

-Run every 5 minutes
-ping
-store the results of the ping, preferabally in a variable, but otherwise in any readable format (I don't know if Linux is equipped with an automated text reader)
-if the results are good, do nothing
-if the results are bad:
-SSH
-Log into the SSH using the username and password (which I have)
-Pass it the command 'reset'
-Close the SSH


So, this is a pretty hefty script. I don't really know where to begin, or, more importantly, if all of these things are even possible.

I could use some input, and would greatly appreciate it.

Thank you
KFJ
 

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LEARN ABOUT DEBIAN

pppoe-connect

PPPOE-CONNECT(8)					      System Manager's Manual						  PPPOE-CONNECT(8)

NAME

       pppoe-connect - Shell script to manage a PPPoE link

SYNOPSIS

       pppoe-connect [config_file]

       pppoe-connect interface user [config_file]

DESCRIPTION

       pppoe-connect  is  a  shell  script  which  manages a PPPoE connection using the Roaring Penguin user-space PPPoE client.  If you omit con-
       fig_file, the default file /etc/ppp/pppoe.conf is used.	If you supply interface and user, then they override the  Ethernet  interface  and
       user-name settings in the configuration file.

       Note that normally, you should not invoke pppoe-connect directly.  Instead, use pppoe-start to bring up the PPPoE connection.

       pppoe-connect  first  reads a configuration file.  It then brings up a PPPoE connection.  If the connection ever drops, a message is logged
       to syslog, and pppoe-connect re-establishes the connection.  In addition, each time the connection is dropped  or  cannot  be  established,
       pppoe-connect executes the script /etc/ppp/pppoe-lost if it exists and is executable.

       The shell script pppoe-stop causes pppoe-connect to break out of its loop, bring the connection down, and exit.

TECHNICAL DETAILS

       pppoe-connect uses the following shell variables from the configuration file:

       ETH    The Ethernet interface connected to the DSL modem (for example, eth0).

       USER   The PPPoE user-id (for example, b1xxnxnx@sympatico.ca).

       PIDFILE
	      A file in which to write the process-ID of the pppoe-connect process (for example, /var/run/pppoe.pid).  Two additional files ($PID-
	      FILE.pppd and $PIDFILE.pppoe) hold the process-ID's of the pppd and pppoe processes, respectively.

       By using different configuration files with different PIDFILE settings, you can manage multiple PPPoE connections.  Just specify  the  con-
       figuration file as an argument to pppoe-start and pppoe-stop.

AUTHOR

       pppoe-connect was written by David F. Skoll <dfs@roaringpenguin.com>.

       The pppoe home page is http://www.roaringpenguin.com/pppoe/.

SEE ALSO

       pppoe(8),  pppoe-start(8),  pppoe-stop(8), pppd(8), pppoe.conf(5), pppoe-setup(8), pppoe-status(8), pppoe-sniff(8), pppoe-server(8), pppoe-
       relay(8)

4th Berkeley Distribution					 21 February 2000						  PPPOE-CONNECT(8)
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