dual ethernet port ping problem
 

I have a x86 based PCM 6892 motherboard with a dual ethernet port 8139too.I am using Fedora Core 3 linux. I configured the devices so that eth0 has ip address x.x.x.1 and eth1 has ip address x.x.x.2. If eth0 cable is removed then x.x.x.1 and x.x.x.2 both do not respond to a ping request, whereas when eth1 cable is removed i get a response. I also tried bonding. I created a bond0 in active backup mode and enslaved eth0 and eth1. My problem was solved and i began to get response to ping even if one of the cables was removed. BUT if both the cables are present i recieve a DUPLICATE response to ping. Is there any solution?
Or is there any other solution other than bonding?
It would be ok even if i could configure the dual port so that it would behave like 2 separate ports
Thanking in anticipation