3 Wan configuration problem

Discussion in 'Installation/Configuration' started by bAnDiTu, Nov 29, 2012.

  1. bAnDiTu

    bAnDiTu New Member

    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!
     
  2. Mark_NL

    Mark_NL New Member

    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.
     

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