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userInThisWorld
Asked: 2012-07-30 01:02:42 +0800 CST

How do I block a protocol using iptables firewall

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How to block a specific protocol using iptables firewall? For example block Yahoo messenger?

firewall

1 Answers

  1. Well, in this case you probably want to block the ports Yahoo Messenger uses, not the protocol (which is TCP/UDP, used by almost everything else).

    Based on this list, I would start with port 5050 outbound and perhaps add more:

    sudo iptables -A OUTPUT -p tcp --dport 5050 -j DROP

    Once you have a set of rules that you have determined is sufficient, don't forget to save them with iptables-save (or they will be lost upon reboot).

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