url filtering

What is the best free solution to provide access to only a select set of websites like a white list.  Our office currently uses a WebRamp (RampNetworks was purchased by Nokia and later shut down).  It is limited to 255 allowed addresses.  I was looking at using IPCop with the URL Filter add on.  I'm comfortable with installing a router package like those and M0n0wall, but probably wouldn't make it through manually configuring Squid or the like.  Thoughts on Redwall fireall, pfSense, Smoothwall?  Any insight would be great.  Thanks.
mhab12Asked:
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lrmooreConnect With a Mentor Commented:
Do you have a Windows server and do you have an internal DNS?
An internal DNS server is the simplest solution. Don't add forwarders or root hints, just add records for those individual sites that you want to connect to. Block outbound dns at the router.
What type of WAN connection do you have? Many routers like Linksys have this capability to set up a white list.
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mhab12Author Commented:
We do run a Windows DNS server, however the issue is that certain clients use a different default gateway to have unrestricted access while others use this gateway to receive only filtered access.  Both groups of clients use the same DNS server for local name resolution, and right now for WAN name resolution as well.

More of my current situation is in a another question...
http://www.experts-exchange.com/Networking/Q_22049832.html
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lrmooreCommented:
A 2nd DNS server would be simple to set up. One to serve only the restricted users.

Any Windows server or any Linux box would work.
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mhab12Author Commented:
What would be the situation with an unrestricted client from DNS1 trying to access a restricted DHCP client from DNS2 or vice versa?  Currently records are created via DHCP or by Windows clients (register this connection's address in DNS).  I really like your solution and can't believe how easy it would be to administer.  Talk me through how the two DNS databases could be synced or otherwise communicate.
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mhab12Author Commented:
Another thought...would these entries in the filtering DNS server be static?  Would I have to update them whenever the target IP of a given URL actually changed?
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prashsaxConnect With a Mentor Commented:
You can use a proxy server. If you want you can buy WinProxy. It has URL filtering support.

If you don't want to buy one, then you can try SquidNT. Its a squid proxy server for Windows Platform.
And you can configure it to do the URL filtering.
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lrmooreCommented:
That's one problem with a white list. It's a manual process and urls and ips are always subject to change.
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