[mdlug] efficient networking script?

[mat.enders at gmail.com]

Tony,

          I think it is fairly efficient.  I do a similar thing with the network shares at school. I run 15 cron jobs every minute of everyday to run a chgrp command recursively on the different shares so the files get the correct groups so they are readable and writable by the appropriate groups. 
Sent on the Sprint® Now Network from my BlackBerry®

-----Original Message-----
From: Tony Bemus <tony at bemushosting.com>
Sender: mdlug-bounces at mdlug.org
Date: Wed, 06 Apr 2011 12:35:16 
To: <mdlug at mdlug.org>; <discuss at mug.org>
Reply-To: MDLUG's Main discussion list <mdlug at mdlug.org>
Subject: [mdlug] efficient networking script?

Hello all,
    I just loaded an old laptop with a firewall distro called IP Fire
(http://www.ipfire.org/), it is based on IP Cop.  I have set it up with
a green+red config.  The red interface is a USB NIC(phone) and the green
is the built in NIC.  When I unplug the USB NIC it looses the red
interface, as expected.  then later I plug in the USB NIC and the red
interface is there but doesn't configure the static ip.  If I run
"./etc/init.d/network restart" then the red interface get the static IP.

I wrote a script that checks if the interface is there and if there is
an IP address.  If there is no interface it does nothing,  if there is
an interface and a IP address it does nothing. but if there is an
interface and NO IP address then it restarts the network.  
This allows my wife and I to just plug in the USB NIC (phone) and wait a
minute and then the Internet starts working,  no commands to run.

My question: Is this an efficient way to do this?  
I have fcron running the script every minuet.


#!/bin/bash

red=`ifconfig | grep red0 | wc -l`
if [ "${red}" -gt "0" ]; then
echo "Red Interface Exists";
ip=`ifconfig | grep 192.168.1.2 | wc -l`
if [ "${ip}" -gt "0" ]; then
echo "IP address Exists";
else 
echo "Restarting network";
sh /etc/init.d/network restart
fi
else
echo "No Red Interface";
fi


Tony Bemus

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