seeking cheap firewall solution

[Info Galway Library]

Hi,

In one of our branches we have 4 internet pcs connected to the internet via
a LAN modem and an ISDN line. We connect to the internet through an ISP. Our
plan is to attach a Windows NT workstation running Personal Web Server to
this network. This will serve webpages to the 4 internet pcs. It should only
respond to requests from these pcs and not respond to internet traffic. How
do I make this webserver secure from hackers? Do I need an additional
router?

Any help would be greatly appreciated.

Regards
John Fitzgibbon
 
Galway Public Library
Island House
Cathedral Square
Galway
Ireland
 
http://www.galwaylibrary.ie 

Phone: 00 353 91 562471
Fax: 00 353 91 565039