topic Re: Block Skype in Operating System - HP-UX

Block Skype

Daniel Caçador — Tue, 25 Sep 2007 09:32:03 GMT

Oi!
How I block skype? I am using proxy squid and the IPTables.

Thanks!

Re: Block Skype

Steven E. Protter — Tue, 25 Sep 2007 09:38:23 GMT

Shalom,

Figure out what ports skype uses and use iptables to block it.

Lets say its port 33500

iptables -A INPUT -p all --dport 33500 -j DROP

Some variation of that.

Or you could do this:

http://www.fs-security.com

Install firestarter. Configure the firewall in a corporate way, e.g. blacklist everything only allow the ports you want inbound and outbound. Firestarter is an iptables code generator and lets you use an X gui to save coding time.

SEP

Re: Block Skype

Geoff Wild — Tue, 25 Sep 2007 10:08:18 GMT

It may be possible to use the following:

Block the hard coded nodes IPs for Skype : (this must be done on the gateway or the firewall)

66.235.180.9
66.235.181.9
80.160.91.12
80.161.91.25
212.72.49.141
212.72.49.142
212.72.49.143
195.215.8.141
195.215.8.145
64.246.49.61
64.246.49.60
64.246.48.23

Use iptables to block them from a linux gateway:

iptables -A FORWARD -p udp -i eth1 -d 66.235.180.9 -j DROP
.........
.....
....
iptables -A FORWARD -p udp -i eth1 -d 64.246.48.23 -j DROP

that was to UDP packets , repeat the same for TCP :

iptables -A FORWARD -p tcp -i eth1 -d 66.235.180.9 -j DROP
.........
.....
....
iptables -A FORWARD -p tcp -i eth1 -d 64.246.48.23 -j DROP

Other methods to block skype is by using a proxy server and disabling IP string addressed and rejecting the CONNECT command. But using proxy server just to prevent users from using skype is not a good idea.

Rgds...Geoff