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jeremy |
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#!/bin/bash
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# $Id: alcasar-load_balancing.sh 219 2010-08-30 23:49:58Z jeremy $
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# alcasar-load_balancing.sh Load-balance internet connection over two or more local links
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#
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# Version: 0.8.0 - Wed, Sep 01, 2010
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#
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# by Author: BOUIJOUX Franck (3abTux) <3abtux@free.fr>
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# en cours d'expérimentation et d 'écriture
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#
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# Définion des poids des routes
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WEIGHT1=1
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WEIGHT2=1
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WEIGHT3=3
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# Set devices:
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DEV1=${1-eth0} # defaut eth0
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DEV2=${2-eth0} # defaut eth0 mais peut être autre chose :-)
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DEV3=${3-eth0} # defaut eth0 mais peut être autre chose :-)
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# Trouver les adresses pour chaque interface
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IP1=`ifconfig $DEV1 | grep inet | awk '{ print $2 }' | awk -F: '{ print $2 }'`
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IP2=`ifconfig $DEV2 | grep inet | awk '{ print $2 }' | awk -F: '{ print $2 }'`
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#IP3=`ifconfig $DEV3 | grep inet | awk '{ print $2 }' | awk -F: '{ print $2 }'`
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# iTrouver les passerelles pour chaque interface
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#GW1=`route -n | grep $DEV1 | grep '^0.0.0.0' | awk '{ print $2 }'`
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#GW2=`route -n | grep $DEV2 | grep '^0.0.0.0' | awk '{ print $2 }'`
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GW1=192.168.1.6
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GW2=192.168.1.1
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#GW3=192.168.1.6
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echo "Acces internet depuis $DEV1: IP=$IP1 par la GW=$GW1"
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echo " et depuis $DEV2: IP=$IP2 par la GW=$GW2"
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#echo " et depuis $DEV3: IP=$IP3 par la GW=$GW3"
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# Definition des routes
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# Tester si les tables existent sinon les créer
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if [ -z "`cat /etc/iproute2/rt_tables | grep '^252'`" ] ; then
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echo "252 rt_dev1" >> /etc/iproute2/rt_tables
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fi
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if [ -z "`cat /etc/iproute2/rt_tables | grep '^251'`" ] ; then
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echo "251 rt_dev2" >> /etc/iproute2/rt_tables
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fi
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#if [ -z "`cat /etc/iproute2/rt_tables | grep '^250'`" ] ; then
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# echo "250 rt_dev3" >> /etc/iproute2/rt_tables
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#fi
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# Tables de routage
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ip route add default via $GW1 table rt_dev1
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ip route add default via $GW2 table rt_dev2
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#ip route add default via $GW3 table rt_dev3
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# Créatin des règles
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ip rule add from $IP1 table rt_dev1
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ip rule add from $IP2 table rt_dev2
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#ip rule add from $IP3 table rt_dev3
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# Effacer la route par défaut existante
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if [ ! -z "`ip route show table main | grep 'nexthop'`" ] ; then
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ip route del default scope global
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fi
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# Alterne les liens basés sur chauqe route
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ip route add default scope global nexthop via $GW1 dev $DEV1 weight $WEIGHT1 \
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nexthop via $GW2 dev $DEV2 weight $WEIGHT2
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# nexthop via $GW3 dev $DEV3 weight $WEIGHT3
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# Purge le cache
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ip route flush cache
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# Fin de alcasar-load_balancing.sh
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