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IPTables: Deny Messenger access

July 3, 2007

We can use the next rule to deny MSN Messenger access in our LAN. You must have Kernel 2.6.14 with the IPTables STRING module:

iptables -I FORWARD -p tcp -m string --string "VER " --from 51 --to 56 --algo bm -j REJECT

The STRING module search into the packet a text string. The “from” “to” parameters means the TCP header end and end of data.

Source: VivaLinux!

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One comment

  1. To block messenger, see:

    http://www.taringa.net/posts/ebooks-tutoriales/3716751/bloquear-messengers-IMs-y-Redes-Ociales.html



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