[LARTC] setup fail-over with redhat9...

["Cristiano Soares" <stillnick2@terra.com.br>]

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Hi. Im now decribeing my problem very clearly to see if anyone could help me. 

I have 3 (three) nics in my system.
    1 is for my internet network - (eth1)
    2 are for my 2 adsl lines that i use to connect to the internet (eth2 is my "master" adsl line) and (eth0 is my "slave" adsl line).

I know that to make redundance work ill have to setup the ip route and ip rule in my system. To do that, i found a bash script called "NETSANE - http://muse.linuxmafia.org/netsane/". I have to change somethings like interface of the first and second lines in netsane.conf. So, i did all the changes needed. Looking good so far, i can ping outside sites the both eth2 and eth0 doing "ping -I eth# www.kernel.org", i dont have a "default route" and etc.
Ok, now goes the worse part. I cant MASQUERADE the connection to my internal network, and even if i could, will redundance work if the first interface fails? I dont think so. Because i tried a normal ping (ping www.kernel.org) and it always goes through eth2, even the i unplug the adsl line from the router/modem to simulate a down link.
I believe that should be an IPTABLES configuration to make NAT work with redundance, not the usual below:

#!/bin/sh

IPTABLES=/sbin/iptables

#All The lines below are NAT routing

# flush any old rules
$IPTABLES -F -t nat

# turn on NAT (IP masquerading for outgoing packets)
$IPTABLES -A POSTROUTING -t nat -o eth0 -j MASQUERADE

# enable IP forwarding (of incoming packets)
echo 1 > /proc/sys/net/ipv4/ip_forward


Im using the rc.firewall-2.4 right now, and it clearly doesnt work with redundance.
Here is my network.

        LAN
                              
         _/\__/\_                                                                              +---+----+                                                                                              _/\___/\_
        /             \       (eth2) - 192.168.1.200 (GTW-192.168.1.1)    |          |     (eth0) - 192.168.0.200 (GTW-192.168.0.254)                  /              \
       ( Router1  )------------------------------------------------+ Linux box +    ----------------------------------------------------------( Router 2 )
        \_  __  _  /                                                                               |         |                                                                                                \ _  __  _  /
            \/   \/                                                                                 +----+---+                                                                                                \/     \/ 
                                                                                                        |        |
                                                                                              (eth1) - 192.168.2.1
                                                                                                --------------------                              
                                                                                                |                            |
                                                                                                |      LAN                |
                                                                                                |Ex:192.168.2.20    |
                                                                                                |  192.168.2.21...    |
                                                                                                -----------------------------

Sites I tried: http://lartc.org/howto/lartc.rpdb.multiple-links.html
http://www.ssi.bg/~ja/nano.txt

THANKS A LOT

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