routing within same nic card

["Wennie V. Lagmay" <wlagmay@xxxxxxxxxxxxx>]

Hello,

I have 1 NIC card with 2 ip address:
IP1 = 192.168.3.1/255.255.255.192
Network 1 = 192.168.3.0/255.255.255.192

IP2 = 192.168.4.1/255.255.255.248
Network 2 = 192.168.4.0/255.255.255.248

My question, how can workstations from network 1 reaches the workstations in 
network 2 and vice versa  using IPtables?

Thanks,

Wennie