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  1. #1

    2 Uplinks for load balancing... Please help

    May I ask a bit technical question?
    I have struggled this for a few days, but still no result.

    Currently we have
    uplink A :
    gateway A :
    Server 1 IP:
    Server 2 IP:

    3 connections to the hubs:
    eth0 of server 1 to hubs
    eth0 of server 2 to hubs
    uplink A to hubs

    We would like to have a 2nd uplink from different ISP for load balancing,
    and build a server 3 (running Linux) as a gateway as below

    2nd uplink is -
    uplink B :
    gateway B :

    Server 1 IP:
    Server 2 IP:

    and Server 3 contains 3 NIC which -
    Server 3 eth0 connected to uplink A
    Server 3 eth1 connected to uplink B
    Server 3 eth2 connected to the hub

    3 connections to the hubs:
    eth0 of server 1 to hubs
    eth0 of server 2 to hubs
    eth2 of server 3 to hubs

    and can server 3 acts as a gateway, which can
    1. for packet destination is US from the hub (i.e. server 1 and 2), then use uplink A. Otherwise use uplink B.
    2. Provide some traffic monitoring and control.

    Can a Linux gateway server support above requirement?
    I tried to setup those routing, ip_forward, in server 3 and server 3 can go to internet, ftp, ping server 1 and 2.
    However, server 1 and 2 can ping server 3, but they failed to connect to Internet.

    Please see the attachment for details.

    If so, any hint(s) or reference document?

    Many Many Thanks.

    Attached Thumbnails Attached Thumbnails 2_uplinks.gif  
    Last edited by george_to; 07-11-2005 at 09:25 PM.

  2. #2
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