You need to at least put a software fireall of some kind of the computers( BlackIce Defender, Norton Firewall, etc). There are also free versions on the internet. Is this for a home, or office? hope this helps....
Your Linksys router should already have a firewall built into it. Make sure you change the default admin password. Use WEP encryption to avoid having anyone nearby from attaching to your network. If you are really concerned, you can enable MAC filtering. If you follow these steps you should not really need any addition 3 party firewall products.
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