We to answer your question, Mono is a router, It will hand out DHCP address to anything that request's it from the network. from monowall you would have to connect it to a external switch. that will intern connect to mono. and you can have as many switches as poss.
to answer your question i believe you can do what your trying to achieve by adding the extra 2 nic cards for a total of 4 nic card, but lets not forget that one of those nic's will be used from the connection from your modem. so leaving you with only 3 cards and you can simply bridge them to your prrimary nic card that you designate as your primary, and then the other 2 will be opti's
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