Routing problem for dual network interfaces

[John Mok]

Hi,

I am trying to setup a server on Ubuntu 8.0.4 (kernel 2.6.24) with 2
network interfaces (e.g. eth0 and eth1), each of which runs a network
service. My problem is that the only one interface respond correctly at
any time. I tried to 2 routing tables, such that the return packet
always go out from the interface which receive the incoming request :-

routing table T1 for eth0, and T2 for eth1

in /etc/iproute2/rt_tables

...
200    T1
201    T2

# ip rule add iif eth0 table T1
# ip rule add iif eth1 table T2
# ip route replace default via gw dev eth0 table T1
# ip route replace default via gw dev eth1 table T2

When I ping the 2 IP interfaces eth0 and eth1 in the local subnet, the
Ethernet MAC addresses on the 2 interfaces are the same :-

C:\>arp -a

Interface: 10.144.1.74 --- 0x10003
   Internet Address      Physical Address      Type
   10.144.1.51           00-07-e9-19-df-08     dynamic
   10.144.1.52           00-07-e9-19-df-08     dynamic

Is there anything I have done wrong? I hope someone could help point me
the mistakes.

Thanks a lot.

John Mok