blocking sites

[Shali 9846303531]

Dear Sir,

We are providing internet services in linux machines.now we required to
block some sites in the machines.is it possible to block sites without
configuring proxi server ?. i mean in the browser or in the system?

-- 
Shali.K.R
Asst.Librarian(Digital)
Vidya Academy of Science & Technology
Thrissur, Kerala.
Mob:9846303531
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