two interface cards

i am doing a project in which there are two network interface cards configured in my  red hat 8.0 machine 192.168.0.1 and 192.168.0.2 i want thatt when i send packet from my 
one card(192.168.0.1) to other(192.168.0.2) then these packets do not reach  the other card internally but rather externally i.e they get out from my first intyer face caed take a trip of the outside network and then my other inter face card" how could i achieve this???
 
if u don,t know the answer please tell me an appropiate mailing list where i should 
put up this question
 thankyou
noma


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