Flaky network connection? This script will let your computer solve your its connectivity problems while you’re away:

Download the script

If you want to get the script, here it is.

Please keep in mind that the listing below is non-functional due to WordPress formatting limitations (it damages the quotation marks).

See the listing

Below the listing are installation instructions.

#!/bin/bash

# edit these variables to suit your needs NETHOSTS="rudd-o.com gplhost.com mozilla.org" # network hosts to check ROUTERIPS="200.63.232.1" # IPs in the immediate physical neighbor network INTERFACE="eth1" # network interface name DRIVER="cdc_ether" # device driver operating the network interface

SUDO="sudo" # uncomment to use sudo, if you're running this as non-root

netconnected() {

for host in $NETHOSTS; do NETCONNECTED=no $SUDO ping -c 4 $host > /dev/null [ "$?" == "0" ] && { NETCONNECTED=yes ; return ; } done

}

routersaccessible() {

for host in $ROUTERIPS; do ROUTERSACCESSIBLE=no $SUDO ping -c 4 $host > /dev/null [ "$?" == "0" ] && { ROUTERSACCESSIBLE=yes ; return ; } done

}

ifdownifup() {

$SUDO /sbin/ifdown $INTERFACE $SUDO /sbin/ifup $INTERFACE

}

reloaddriver() {

$SUDO /sbin/ifdown $INTERFACE $SUDO /sbin/modprobe -r $DRIVER $SUDO /sbin/modprobe $DRIVER $SUDO /sbin/ifup $INTERFACE

}

this prevents two netrepaird instances from running simultaneously

lockfile="/var/lock/netrepaird-$INTERFACE" if ( set -o noclobber; echo "$$" > "$lockfile") 2> /dev/null; then trap 'rm -f "$lockfile"; exit $?' INT TERM EXIT else echo "Failed to acquire lockfile: $lockfile." echo "Held by $(cat $lockfile)" exit 4 fi

netconnected [ "$NETCONNECTED" == "yes" ] && { exit ; } # network is OK

echo "Network problem, verifying neighbor network connectivity" routersaccessible [ "$ROUTERSACCESSIBLE" == "yes" ] && { echo "Your network connection is OK, but your ISP has network problems" ; logger -t netrepaird -p local0.warn "Network connection OK but the ISP is having network problems" ; exit 2 ; }

echo "Network problem, toggling network interface $INTERFACE" ifdownifup ; netconnected [ "$NETCONNECTED" == "yes" ] && { echo "Network OK after interface toggle" ; exit ; }

echo "Network problem, reloading driver" reloaddriver ; netconnected [ "$NETCONNECTED" == "yes" ] && { echo "Network OK after driver reload" ; exit ; }

echo "Could not repair your network connection" logger -t netrepaird -p local0.warn "Could not repair network connection" exit 1

Installation and usage instructions

Please see the Installing this script section on this page.

License

GPL v2, as usual.