using several NIC card or sockets?

I've an application (with VC++6)that I would to do it run on severals network segment(my appliction is based on ARP protocol, so it work on one segment ),for this I have two solutions:
- make my appliction as client sever, so I install it on sevral segment (servers), this instance are launched from one machine(client) and the result is communicted to it,by usin sockets.
the pb is that my application consume a high lot of resurces, (because it treat all netwok traffic ), so I must dedicate one machine per application. if I have 5 segment,I must dedicate 5 machines!. In addition, as my appliction cosume high lot of resurces there is many system crash. For this, the following solution is:
-use several Network Card, each one is bound to a segment. and to launch my appliction one a segment i select the appropriate card-by the function PacketGetAdapterNames()- the results are displayed one my screen, if there is any pb in the system i solve it directly.
What do you suggest?