Balanceamento e Redundância utilizando 2 Links Speedy (ip fixo)

Descrição

Esconder código-fonte

# Criado em 11/07/2008 por Marcelo Ferreira(Ten Ferreira)-marceferreira@hotmail.com
# Alterado em 24/06/2009 por Marcelo Ferreira(Ten Ferreira)-marceferreira@hotmail.com
#
#!/bin/bash

###################
# Balanceamento e Redundancia com 2 Links de internet SPEEDY

######################
echo "Carregando modulos"
modprobe ip_conntrack_ftp
modprobe ip_nat_ftp
modprobe ipt_mark
modprobe ipt_MARK
#
echo "Habilitar FORWARD"
echo "1" > /proc/sys/net/ipv4/ip_forward
#
echo "Habilitar roteamento com 2 links"
echo "0" > /proc/sys/net/ipv4/conf/default/rp_filter
#
echo "Protecao Contra IP Spoofing"
for i in /proc/sys/net/ipv4/conf/*/rp_filter; do
    echo 1 >$i
done

###################
echo "Definicao de variaveis"
GWSPEEDY1="200.204.157.1"
GWSPEEDY2="200.171.248.1"
GWLOCAL="192.168.10.2"
#
IPSPEEDY1="200.204.157.192"
IPSPEEDY2="200.171.248.36"
#
REDESPEEDY1="200.204.157.0/24"
REDESPEEDY2="200.171.248.0/24"
#
PLACASPEEDY1="eth2"
PLACASPEEDY2="eth1"
#
ROTADEL="route del default gw"
ROTAADD="ip route add"
TABLEFLUSH="ip route flush table"
#
APAGAROTAS=`
# GWSPEEDY2
route del -net 200.171.248.0 netmask 255.255.255.0 dev eth1
route add -net 200.171.248.0 netmask 255.255.255.0 gw 200.171.248.36 dev eth1
# GWSPEEDY1
route del -net 200.204.157.0 netmask 255.255.255.0 dev eth2
route add -net 200.204.157.0 netmask 255.255.255.0 gw 200.204.157.192 dev eth2
# REDELOCAL
route del -net 192.168.10.0 netmask 255.255.255.0 dev eth5
route add -net 192.168.10.0 netmask 255.255.255.0 gw 192.168.10.1 dev eth5
`
#
ROTAS2LINKS=`
# Removendo_rotas
$ROTADEL $GWSPEEDY1
$ROTADEL $GWSPEEDY2
# Limpando Rotas das tabelas definidas em /etc/iproute2/rt_tables
$TABLEFLUSH speedy1
$TABLEFLUSH speedy2
# Adicionando Rotas
$ROTAADD $REDESPEEDY1 dev $PLACASPEEDY1 src $IPSPEEDY1 table speedy1
$ROTAADD default via $GWSPEEDY1 dev $PLACASPEEDY1 table speedy1
$ROTAADD $REDESPEEDY2 dev $PLACASPEEDY2 src $IPSPEEDY2 table speedy2
$ROTAADD default via $GWSPEEDY2 dev $PLACASPEEDY2 table speedy2
# Limpando e adicionando rules as tabelas definidas em /etc/iproute2/rt_tables
ip rule del lookup speedy1
ip rule del lookup speedy2
ip rule add from $IPSPEEDY1 table speedy1
ip rule add from $IPSPEEDY2 table speedy2`

###################
echo "substituindo rotas"
$APAGAROTAS

###################
#A regra abaixo é responsável pelo balanceamento com os 2 links (GWSPEEDY1 e GWSPEEDY2)
$ROTAS2LINKS
echo "Adicionando Rota Default para balanceamento entre os links $GWSPEEDY1 e $GWSPEEDY2 ($PLACASPEEDY1+$PLACASPEEDY2)" > /tmp/rotas.log
$ROTAADD default scope global nexthop via $GWSPEEDY1 dev $PLACASPEEDY1 nexthop via $GWSPEEDY2 dev $PLACASPEEDY2
ip route flush cache #Limpa as rotas no cache

###################
# $?=0 link estah up ou $?=1 link estah down
echo "Teste de conexao aos links de internet"
ping 4.2.2.2 -c 2 -I $PLACASPEEDY1 ; TESTESPEEDY1=$?
ping 4.2.2.2 -c 2 -I $PLACASPEEDY2 ; TESTESPEEDY2=$?

###################
#A regra abaixo informa que nao ha conexao ou link
if [[ $TESTESPEEDY1 -eq 1 && $TESTESPEEDY2 -eq 1 ]]; then
echo "!!!!!!!!!Atencao nao ha conexao com a internet!!!!!!!!!" > /tmp/rotas.log

###################
#A regra abaixo é responsável pelo balanceamento soh com o link GWSPEEDY1
elif [[ $TESTESPEEDY1 -eq 0 && $TESTESPEEDY2 -eq 1 ]]; then
echo "Adicionando Rota Default para balanceamento soh com o link $GWSPEEDY1 ($PLACASPEEDY1)" > /tmp/rotas.log
$ROTADEL $GWSPEEDY1
$ROTADEL $GWSPEEDY2
$TABLEFLUSH speedy2
$ROTAADD default scope global via $GWSPEEDY1 dev $PLACASPEEDY1
ip route flush cache #Limpa as rotas no cache

###################
#A regra abaixo é responsável pelo balanceamento soh com o link GWSPEEDY2
elif [[ $TESTESPEEDY1 -eq 1 && $TESTESPEEDY2 -eq 0 ]]; then
echo "Adicionando Rota Default para balanceamento soh com o link $GWSPEEDY2 ($PLACASPEEDY2)" > /tmp/rotas.log
$ROTADEL $GWSPEEDY1
$ROTADEL $GWSPEEDY2
$TABLEFLUSH speedy1
$ROTAADD default scope global via $GWSPEEDY2 dev $PLACASPEEDY2
ip route flush cache #Limpa as rotas no cache
fi