I am no expert at this, but I have a similar setup to yours. However, I use a router/modem (one unit DSL G604T) to access the internet as it acts as a firewall and can attach 4 computers via cable and 2 via wireless..
Basically, the internet cable comes in to the router first. From there it is simple straight through cables from the router/modem leading to two other computers, and a wireless access for my wife's laptop. This router uses a linux kernel as well. Worth the research for simplicity sake and security.
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