How to control HTTP access

Current configuration:
Redhat 4.1 (kernel 2.0.27), with Linux as a router to the internet through lease line modem. One block of Class C ip address allocated for about 50 P.C.

I want to control the ws on my lan to access the internet resources (eg. www,ftp,irc). Is there any method other than firewall and proxy server, which can let me selectively allow ws on my lan to access the internet ?
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Firewall is the best solution. Try ipfwadm (ipfw).

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Linux Networking

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