3 Wan configuration problem

Hello,


I have a problem configuring 3 wan connections on different nics.
Description: 3 real ip address with different nic for each.
Now i use the following script for it:

Code:

#!/bin/bash
### BEGIN INIT INFO
# Provides:          multi-wan
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Example initscript
# Description:       This file should be used to construct scripts to be
#                    placed in /etc/init.d.
### END INIT INFO

# Some things that run always
touch /var/lock/multi-wan

# Carry out specific functions when asked to by the system
case "$1" in
 start)
   echo "Starting script multi-wan "
   ;;
 stop)
   echo "Stopping script multi-wan"
   ;;
 *)
   echo "Usage: /etc/init.d/multi-wan.sh {start|stop}"
   exit 1
   ;;
esac

# CONFIGURATION
IP=/sbin/ip
PING=/bin/ping

#--------------- LINK PART -----------------
# EXTIFn - interface name
# EXTIPn - outgoing IP
# EXTMn  - netmask length (bits)
# EXTGWn - outgoing gateway
#-------------------------------------------

# LINK 1
EXTIF1=eth0
EXTIP1=192.168.0.2
EXTM1=27
EXTGW1=192.168.0.1

# LINK 2
EXTIF2=eth1
EXTIP2=89.165.182.226
EXTM2=27
EXTGW2=89.165.182.225

# LINK 3
EXTIF3=eth2
EXTIP3=89.165.182.227
EXTM3=27
EXTGW3=89.165.182.225

#ROUTING PART
# removing old rules and routes

echo "removing old rules"
${IP} rule del prio 50 table main
${IP} rule del prio 201 from ${EXTIP1}/${EXTM1} table 201
${IP} rule del prio 202 from ${EXTIP2}/${EXTM2} table 202
${IP} rule del prio 203 from ${EXTIP3}/${EXTM3} table 203
${IP} rule del prio 221 table 221
echo "flushing tables"
${IP} route flush table 201
${IP} route flush table 202
${IP} route flush table 203
${IP} route flush table 221
echo "removing tables"
${IP} route del table 201
${IP} route del table 202
${IP} route del table 203
${IP} route del table 221

# setting new rules
echo "Setting new routing rules"

# main table w/o default gateway here
${IP} rule add prio 50 table main
${IP} route del default table main

# identified routes here
${IP} rule add prio 201 from ${EXTIP1}/${EXTM1} table 201
${IP} rule add prio 202 from ${EXTIP2}/${EXTM2} table 202
${IP} rule add prio 203 from ${EXTIP3}/${EXTM3} table 203

${IP} route add default via ${EXTGW1} dev ${EXTIF1} src ${EXTIP1} proto static table 201
${IP} route append prohibit default table 201 metric 1 proto static

${IP} route add default via ${EXTGW2} dev ${EXTIF2} src ${EXTIP2} proto static table 202
${IP} route append prohibit default table 202 metric 1 proto static

${IP} route add default via ${EXTGW3} dev ${EXTIF3} src ${EXTIP3} proto static table 203
${IP} route append prohibit default table 203 metric 1 proto static

# mutipath
${IP} rule add prio 221 table 221

${IP} route add default table 221 proto static \
           nexthop via ${EXTGW1} dev ${EXTIF1} weight 1\
           nexthop via ${EXTGW2} dev ${EXTIF2} weight 2\
           nexthop via ${EXTGW3} dev ${EXTIF3} weight 3

${IP} route flush cache
echo "Done !"

while : ; do
 ${PING} -c 1 ${EXTGW1}
 ${PING} -c 1 ${EXTGW2}
 ${PING} -c 1 ${EXTGW3}
echo "Done !"
 sleep 60
done

But after a time the 3nd ip is not active, cannot be accesed from extern.
And after reboot, i need to remove some ip rules and restart the script and networking.
I need a script or commands for configuring 3 wans to be active.


Thank you in advance and sorry for my bad english!

 

You're going oldskool! Install shorewall and let it take care of all that stuff.
I've done it your way as well some time ago, until i saw the light .. Shorewall Firewall!

see: http://www.shorewall.net/MultiISP.html

It's pretty straight forward. Define your "providers" (outgoing gateways) and set a priority to them, reload shorewall, done.