RE: Not understanding network setup!!

Linux Advanced Routing and Traffic Control

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Hi to all,

> I very much doubt the above was quoted on the LARTC HOWTO. Please point
us to where you saw this. It is completely wrong.
>
This is where I got it from:
http://www.lartc.org/lartc.html#LARTC.LOADSHARE - (Chapter 10. Load
sharing over multiple interfaces).

I actually implemented the setup blindly without understandig it and it
worked..When I tried to change the topology of the network and the ip
addresses, then I got problems.

This is what I'm trying to do:

       __________         _____________         _________
      |          |       |             |       |         |
      |      eth1|-------|eth0 FW1 eth1|-------|eth1     |
      |          |       |_____________|       |         |
PC_A--|eth0 PC_B |                             |PC_C eth0|--PC_D
      |          |        _____________        |         |
      |      eth2|-------|eth0 FW2 eth1|-------|eth2     |
      |__________|       |_____________|       |_________|


The configurations on the respective PCs are:
PC_A:
eth0 = 192.168.0.10/24
#ip route add default via 192.168.0.1

PC_B:
eth0 = 192.168.0.1/24
eth1 = 192.168.10.10/24
eth2 = 192.168.40.10/24

FW1:
eth0 = 192.168.10.11/24
eth1 = 192.168.20.11/24

FW2:
eth0 = 192.168.40.11/24
eth1 = 192.168.50.11/24

PC_C:
eth0 = 192.168.30.1/24
eth1 = 192.168.20.10/24
eth2 = 192.168.50.10/24

PC_D:
eth0 = 192.168.30.10/24
#ip route add default via 192.168.30.1

I'm trying to load balance the traffic from PC_A to PC_D over the two PCs
FW1 and FW2, using teql. I tried to follow the steps in the LARTC HOWTO
but it's not working. Actually I'm having problems setting up the routing
on these PCs with regard to teql. I simply don't know how to do it. I have
enabled ip forwarding (ip_forward) and disabled reverse path filtering
(rp_filter) on PC_B, PC_C, FW1 & FW2 for all NICs. B & C have 2.6.16
kernels with kernel options like advanced routing
(CONFIG_IP_ADVANCED_ROUTER) and multipath route support selected.

When I ping from PC_A to PC_D, I'm getting "Destination host Unreachable"
msg. What am I doing wrong?

I know you guys are really good at this kind of stuff..pls help me out.

Warm regards,
Visham



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