#!/bin/bash

# Abreviaciones
IP=/sbin/ip
PING=/bin/ping
KILLALL=/bin/killall

# Interface externa 1
IFE1=eth1
IPE1=172.16.224.3
NWE1=172.16.224.0
NME1=24
BRDE1=172.16.224.255
GWE1=172.16.224.1

# Interface externa 2
IFE2=eth2
IPE2=172.16.5.7
NWE2=172.16.5.0
NME2=24
BRDE2=172.16.5.255
GWE2=172.16.5.2

# Interface local
IFI=eth0
IPI1=10.0.0.112
NWI1=10.0.0.0
NMI1=8
BRDI1=10.255.255.255
IPI2=200.16.24.200
NWI2=200.16.24.128
NMI2=25
BRDI2=200.16.24.255


# Red de toda la UNC
NWUNC=200.16.16.0
NMUNC=20

start() 
{ echo "Configurando interfaz de loopback..."
  $IP link set lo up                      > /dev/null 2>&1
  $IP addr add 127.0.0.1/8 brd + dev lo   > /dev/null 2>&1

  echo "Configurando primera interfaz externa..."
  $IP link set $IFE1 up
  $IP addr add $IPE1/$NME1 brd $BRDE1 dev $IFE1

  echo "Configurando segunda interfaz externa..."
  $IP link set $IFE2 up
  $IP addr add $IPE2/$NME2 brd $BRDE2 dev $IFE2

  echo "Configurando  interfaz interna..."
  $IP link set $IFI up 
  $IP addr add $IPI1/$NMI1 brd $BRDI1 dev $IFI #Esta interface tine 2 ips
  $IP addr add $IPI2/$NMI2 brd $BRDI2 dev $IFI #

 

 echo "Estableciendo reglas de ruteo..."

  $IP rule add prio 50 table main #Le damos la prioridad mas alta a la tabla main
  $IP rule add prio 100 to $NWUNC/$NMUNC table redUnc
  $IP rule add prio 201 from $NWE1/$NME1 table redUnc
  $IP rule add prio 202 from $NWE2/$NME2 table adsl
  $IP rule add prio 220 table loadBal 
                                      
  echo "Estableciendo tablas de ruteo..." 

  $IP route add default via $GWE1 dev $IFE1 src $IPE1 proto static table redUnc
  $IP route append prohibit default table redUnc metric 1 proto static


  $IP route add default via $GWE2 dev $IFE2 src $IPE2 proto static table adsl
  $IP route append prohibit default table adsl metric 1 proto static


  $IP route add default table loadBal proto static \
                                                   nexthop via $GWE1 dev $IFE1 weight 1 \
                                                   nexthop via $GWE2 dev $IFE2 weight 1

 

  /etc/rc.d/rc.gwdetect $GWE1 $GWE2 & #Lo ejecutamos en background
}

stop() 
{ echo "Parando interfaz de loopback..."
  $IP addr flush dev lo      > /dev/null 2>&1 
  $IP link set lo down
  
  echo "Parando primera interfaz externa..."
  $IP addr flush dev $IFE1   > /dev/null 2>&1
  $IP link set $IFE1 down
  
  echo "Parando segunda interfaz externa..."
  $IP addr flush dev $IFE2   > /dev/null 2>&1
  $IP link set $IFE2 down
  
  echo "Parando  interfaz interna..."
  $IP addr flush dev $IFI    > /dev/null 2>&1
  $IP link set $IFI down
  
  echo "Limpiando tablas de ruteo..."
  $IP route flush table redUnc   > /dev/null 2>&1
  $IP route flush table adsl     > /dev/null 2>&1
  $IP route flush table cache    > /dev/null 2>&1
  $IP route flush table loadBal  > /dev/null 2>&1
  
  echo "Limpiando reglas de ruteo..."
  #Borramos todas las reglas de ruteo que agregamos en la funcion start
  $IP rule del prio 50 table main                     > /dev/null 2>&1
  $IP rule del prio 100 to $NWUNC/$NMUNC table redUnc > /dev/null 2>&1
  $IP rule del prio 201 from $NWE1/$NME1 table redUnc > /dev/null 2>&1
  $IP rule del prio 202 from $NWE2/$NME2 table adsl   > /dev/null 2>&1
  $IP rule del prio 220 table loadBal                 > /dev/null 2>&1 

  #Matamos el script que manda pings
  $KILLALL rc.gwdetect   > /dev/null 2>&1          


}  

case $1 in
  start)
        start
        ;;
  stop)
        stop
        ;;
  restart)
        stop
        start
	;;
  *)
        echo "Uso: { start | stop }"
	;;
esac