Restrict access to Internet

[Amit Patel]

Folks,
   I was wondering if it was possible to limit users access to only selected
list of sites on the internet and block all the rest. Lets say for example I
want my users to access only ubuntu.com and all pages underneath
ubuntu.combut users cannot access anything else such as
yahoo.com or amazon.com, etc.
   Is something like this possible in ubuntu ?
   I am aware of the hosts file and adding entries to it, but it isnt
exactly flexible.

Thankx,
Amit.
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