Multiple ethernet cards

[Russell Shaw <rjshaw@iprimus.com.au>]

Hi,

I put two ethernet cards in my pc. However, i can't
ping a remote host from both interfaces (eth0,eth1, after
swapping the cable over).
If i disable one interface, then i can ping from the
other. Both cards are pci of different brands.
I've tried giving both cards the same address and
different addresses.
I think it's because of the routing. netstat -rn:

Kernel IP routing table
Destination     Gateway         Genmask         Flags   Iface
210.50.118.58   0.0.0.0         255.255.255.255 UH      ppp0
0.0.0.0         210.50.118.58   0.0.0.0         UG      ppp0
192.168.0.0     0.0.0.0         255.255.255.0   U       eth0
192.168.0.0     0.0.0.0         255.255.255.0   U       eth1

I want to connect two PCs to the 3rd gateway PC.