block internet

our network in the office was set up with automatic internet access.
It means, when you connect a machine to our LAN, this machine has immediately internet acces. How is it possible to block the internet from foreign machines ?
Or how to setup the network with restricted internet access ?

Eprs_AdminSystem ArchitectAsked:
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You can try this solution in order to assure a better management of the network and to apply restrictions.

Some info about it:

Centralized configuration from a single network location.
Flexible, prioritized, bidirectional rules to specify maximum data rates.
Rules for IP addresses, protocols, ports (for TCP/IP) and network interfaces.
Transparency for end users.
No software installation is required on client workstations in most cases.
Detailed and comprehensive statistics are available for each rule.
Quotas and penalties to discourage misuse.

Good luck,

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Depending on your needs and budget, you could also look at a couple of different solutions.  You could look at a solution like Websense or an appliance like the ones from St. Bernard (iPrism). These are web filtering solutions that would probably address both your need to stop foreign machines from accessing the Internet as well as provide some level of Internet restriction.
Joseph DalyCommented:
If all you are looking to do is block internet access you may want to think about setting up a server on your network as proxy server.

This any new machine will need to input the proxy server in ie/mozilla/other browser settings in order to reach the net.
Eprs_AdminSystem ArchitectAuthor Commented:
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