Nat Rule ( Req help ASAP)

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Hello All, 

I am using Squid proxy and IPtables Firewall 
through squid I am able to block Messenger and other
sites but If I put this in firewall I couldnt able to
block messenger 
$IPTABLES -t nat -A POSTROUTING -o $EXTIF -j SNAT --to
$EXTIP 
In connection settings If I choose no proxies the
Yahoo messenger easily get connected.

also we use CISCO VPN client to connect Outside VPN
server If I want to connect VPN I need to put that
rules otherwise I wont connect.

Could any one please tell How to solve my problem
I want to block messengers also want to connect VPN
server though client 

Thanks 
Nilesh.



		
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