Blocking websites

valdez_42 · 06-19-2009, 12:35 PM

I used the method off the command line to block certain sites but in a medium to large domain I cant input 1000 websites for every user. So what software or hardware device do yall reconmmend me to use to filter out unneeded websites for my domain!

tekhead2 · 06-19-2009, 12:46 PM

Well personally I use a filtering proxy using dansguardian with antivirus.
http://dansguardian.org. You could make the proxy transparent and that would force all machines to route web traffic through that proxy.

Andy Alt · 06-19-2009, 02:18 PM

I use dnsmasq only as a caching name server for my personal computer, but it has options like the following:

Code:

# Add domains which you want to force to an IP address here.
# The example below send any host in doubleclick.net to a local
# webserver.
#address=/doubleclick.net/127.0.0.1

Quote:

Dnsmasq is a lightweight, easy to configure DNS forwarder and DHCP server. It is designed to provide DNS and (optionally) DHCP to a small network. It can serve the names of local machines which are not in the global DNS. The DHCP server integrates with the DNS server and allows machines with DHCP-allocated addresses to appear in the DNS with names configured either in each host or in a central configuration file. Dnsmasq supports static and dynamic DHCP leases and BOOTP/TFTP for network booting of diskless machines.

custangro · 06-22-2009, 01:58 PM

Quote:

Originally Posted by valdez_42

I used the method off the command line to block certain sites but in a medium to large domain I cant input 1000 websites for every user. So what software or hardware device do yall reconmmend me to use to filter out unneeded websites for my domain!

You can use squid.

-C

farslayer · 06-22-2009, 03:20 PM

Untangle is another option.

http://www.untangle.com/

can be setup as a transparent bridge, so you can insert it between your network and your firewall, without changing any of your other network settings.

Suncoast · 06-28-2009, 10:19 PM

There is also DNS server poisoning.

If the goal is to prevent your users from being redirected to a malicious site, you can black-hole a valid host name within your companies DNS server. Sounds like what you started to do at the host level. There are sites that maintain lists of these domain names that can be resolved to either 127.0.0.1 or a internal virtual domain name with a page that explains the site requested is blocked.

This method is not suitable if your goal is to prevent anyone from accessing say Twitter, as this method is easily circumvented by pointing the work station to an external DNS server.

Febi881 · 06-28-2009, 11:01 PM

Ya...I think SQUID will do...Easy to configure and will tighten your security..