[CentOS] pointers for using CentOS box as filter for children

Leonard Isham leonard.isham at gmail.com
Tue Oct 11 17:23:24 UTC 2005

On 10/11/05, Robert <roberth at abbacomm.net> wrote:
> greetings
> has anyone here setup a CentOS box to use as a home or business gateway for
> children through young adults or otherwise?
> i realize this is a generalized question and that iptables and many other
> things exist that could be implemented.
> im looking for a way to give the youngster the benefit of the doubt and
> allow them to "obey God/parents" first before they have to be totally
> restricted after having been disobedient.
> specifically we could do it two ways.
> one is, that which is not expressly permitted is denied... and i would
> prefer not to have to do it that way. it is too easy and may not allow for
> the child to choose to be obedient to God/parents.
> the other seems like it might be better, that which is not expressly denied
> is permitted... YET
> i want to make sure of only a few things if possible...
> how can i keep the youngster from using an IM program and how to make sure
> they are not transferring files larger that say 100k, ie no large music
> files etc? only small pics or homework things etc.
> can one hit a moving IM program protocol port target that recognizes the
> packets and shut it down?
> also, what packages out there are people using that have time based
> restrictions, like until 11pm or other configs?

Basic Setup
Assign IPs or a subnet to the young ones.
Setup a web proxy (Squid?).
Setup perimeter to block young IPs and limit protocols for proxy.
Cron jobs to block proxy and unblock proxy at the selected times.

Consider Dans Guardian (http://dansguardian.org/)

Leonard Isham, CISSP
Ostendo non ostento.

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