Do I need to implement firewall protection?

I have two clients, both are using W2K Server.  Both are hooked up to another LAN, and lose network connections.  At times one cannot even ping the DNS addresses.  I activated Netwok Monitor on one of the clients and noticed a lot of network traffic.  Disconnected the router from the switch and the local network came back on line.  This particular client is using a Cisco 1600 router.  Would a firewall help prevent unwanted traffic from coming in and leaving the LAN?
tearpearAsked:
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lrmooreCommented:
absolutely, unquivically, without a doubt, don't waste another second or one more brain cell thinking about it, just do it.

Use a device that is built/designed as nothing but a firewall:
http://www.cisco.com/go/pix


http://www.dlink.com
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tearpearAuthor Commented:
Thank-you for the quick response!
Ordered a DL-804v from CDW this afternoon. Hope this device will work for the situation.
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