[CentOS] Firewall/Proxy with time window access control

Thu Aug 14 14:26:07 UTC 2008
Lunix1618 <lunix1618 at gmail.com>

Hello all,

I have to setup a system that required to block users access internet in 
work time but let them access internet on specified time window e.g 
lunch time.

I plan to use iptables and squid to do block and web caching but I have 
no idea how to control access on time frame. Could any one of you 
experienced with this can give some starting point /document/howto start 
reading ?

My firewal/proxy box will be CentOS 5.2 so I prefer something that can 
install via yum/rpm

Thanks in advance!