On Thu, Oct 04, 2012 at 12:57:00PM +0530, vivek chalotra wrote:
> 
> And now i want to block youtube on my network. kindly suggest iptable rules to do that.
>

"block youtube on my network" is not a very well defined wish.

If you want to merely block the well known youtube IP and DNS addresses,
you can use iptables, etc. Be prepared to update these lists frequently
to keep up with things like youtu.be & co.

If you want to prevent users of the network from watching all youtube videos always,
give up now.

First of all, you will have to be able to handle legitimate exceptions:
"how do I watch training videos for Altera Quartus software that
happen to be hosted on youtube?!?".

Second, you will have to handle all the possible 3rd party redirectors,
proxies, and other kludges specifically designed to circumvent
youtube blockers such as you are try to build.

-- 
Konstantin Olchanski
Data Acquisition Systems: The Bytes Must Flow!
Email: olchansk-at-triumf-dot-ca
Snail mail: 4004 Wesbrook Mall, TRIUMF, Vancouver, B.C., V6T 2A3, Canada