sending packets on different tcp/ip stacks

Hi all,

I installed qnx 6.4.0 and my machine has two ethernet interfaces (en0 and en1). I checked /dev it has io-net directory
which contains(en0 and en1).I am able to ping to other machines on both eth interfaces.
I have doubt why the directory name is io-net instead of io-pkt because io-pkt-v4-hc is running.

I tried to initaite second instance of tcp ip stack with the following command
io-pkt-v4-hc -i1 -dpcnet pci=0x1 -ptcpip prefix=/sock2
[My Nic are AMD ]
then i checked /dev directory there was no io-net1
(dir which should contain en0 and en1 so i can configure this tcpip stack to en1 using
SOCK=/sock2 ifconfig en1 up) and ping to other machine using this second stack.please let me know the solution.