load balance

[Vinicius Venit <vinicius_venit@via-rs.net>]

Hi all,

I have a server with 3 Ethernet interfaces

eth0 (ppp0) = internet conexion = DHCP ADSL = dinamic IP address
gateway = 200.216.X.X
eth1 = internal network = 192.168.0.200
eth2 = internet access = 200.xxx.xxx.xxx
gateway = 200.X.X.X

This means I have two internet access in the same server.
In my LAN I'm using the IP scope 192.168.0.0 to 192.168.0.254 and i want
split this IP addresses to make half use one internet acces and the
other half use the other internet acces. Like this:
>From 192.1.0.0 to 192.168.0.128 use the the eth0(ppp0) interface and
>From 192.168.0.128 to 192.168.0.254 use the eth2 interface.

I try to do this using iptables and iproute2:

iptables

iptables -t mangle -A PREROUTING -s 192.168.0.0/25 -j MARK --set-mark 1
iptables -t mangle -A PREROUTING -s 192.168.0.128/25 -j MARK --set-mark
2

iproute2

echo 200 eth0 >> /etc/iproute2/rt_tables 
echo 202 eth2 >> /etc/iproute2/rt_tables 

ip route add fwmark 1 table eth0
ip route add fwmark 2 table eth2

ip rule add from 192.168.0.0/25 table eth0
ip rule add from 192.168.0.128/25 table eth2

ip route add 192.168.0.0/25 dev eth1  scope link table eth0
ip route add default via 200.216.X.X dev ppp0 table eth0

ip route add 192.168.0.128/25 dev eth1  scope link table eth2
ip route add default via 200.X.X.X dev ppp0 table eth2

ip route flush cache

Made this the lower half IP scope (192.168.0.0-128) works fine and get
internet access througth eth2, but the hier IP scope doesn't get
internet access thougth eth1(ppp0) and neither by eth2. 

I have used traceroute command to see what is goin on and I found this:
the hier scope got until the eth1(ppp0) and die over it.

traceroute www.google.com
traceroute to www.google.akadns.net (216.239.53.99), 30 hops max, 38
byte packets
1  192.168.0.125 (192.168.0.250)  2.121 ms  1.688 ms  2.171 ms
2  200.216.95.209 (200.216.xx.xxx)  27.330 ms  32.407 ms  31.147 ms
3  * * *
4  * * *

I wrote the larctc and I print it to read more times.... I really need
read it more times .... but I want to know if someone alredy deal with
this situation or has a problem like this. I really want some help.

Regards,