A little birdy told me that Lunix1618 said: ] 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 i'd just use cron(8)... it should be installed by default... i'd make two sets of firewall rules... one for the "allow" time and one for the "deny" time.... then with cron i'd apply the appropriate set at the appropriate time... B. Karhan simon at pop.psu.edu PRI/SSRI Unix Administrator