Setting of multipath default routes!!

vishamr2000 · 05-31-2006, 12:38 PM

Hi to all,

I got some problems when typing this command:

ip route add default scope global netxhop via 192.168.10.12 dev eth1 weight 1 netxhop via 192.168.10.13 dev eth2 weight 1

When I check the routing table using the 'route' command, I got this:

Destination Gateway Genmask Flags IFace
Default 192.168.10.12 0.0.0.0 UG eth1

What about the other interface (eth2)..is it not supposed to show up in the routing table?

Warm regards,
Visham

unSpawn · 05-31-2006, 06:09 PM

ip route add default scope global netxhop via 192.168.10.12 dev eth1 weight 1 netxhop via 192.168.10.13 dev eth2 weight 1
And you got no errors at all using a faulty directive like "netxhop"? Weird...
"ip route show" shows both devices here after executing the command properly (reverse "tx").

vishamr2000 · 06-01-2006, 01:12 AM

Hi unSpawn,

This is the topology of the network I'm trying to set up:

Code:

       __________         _____________         _________
      |          |       |             |       |         |
      |      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 = 192.168.10.11/24
#ip route del 192.168.10.0/24 dev eth1
#ip route del 192.168.10.0/24 dev eth2
#ip route add default scope global netxhop via 192.168.10.12 dev eth1 weight 1 netxhop via 192.168.10.13 dev eth2 weight 1

FW1:
eth0 = 192.168.10.12/24
eth1 = 192.168.20.12/24
#ip route add 192.168.0.0/24 dev eth0
#ip route add 192.168.30.0/24 dev eth1

FW2:
eth0 = 192.168.10.13/24
eth1 = 192.168.20.13/24
#ip route add 192.168.0.0/24 dev eth0
#ip route add 192.168.30.0/24 dev eth1

PC_C:
eth0 = 192.168.30.1/24
eth1 = 192.168.20.10/24
eth2 = 192.168.20.11/24
#ip route del 192.168.20.0/24 dev eth1
#ip route del 192.168.20.0/24 dev eth2
#ip route add default scope global netxhop via 192.168.20.12 dev eth1 weight 1 netxhop via 192.168.20.13 dev eth2 weight 1

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

I'm trying to set up the routing so as to make enable PC_A to communicate with PC_D. 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?

Warm regards,
Visham