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Any way to block skype from our network using IPTABLES ?

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Find out what port it's running on by installing it on a machine you control and running wireshark. –  Andrew Jul 29 '10 at 6:47
    
it seems skype application uses ports dynamically scanning which are not blocked. –  nitins Jul 30 '10 at 7:13

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up vote 2 down vote accepted

Skype is P2P-like, it's very difficult to block it using only iptables. You should checkout layer7 (http://l7-filter.sourceforge.net/protocols)

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