setting up a firewall on centos

Hey there,
ive been told by friends that my ports are open and that it can be used by others and etc. and have been told to set up a firewall now i know basically almost nothing about this and was wondering if i could get the commands or such on how to set it up thanks:)

Hi Lookatmego,

You can use this command;

Code:

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iptables -A INPUT -p tcp --destination-port PORT-NUMBER -j DROP

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For example block port 135 for everyone:

Code:

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iptables -A INPUT -p tcp --destination-port 135 -j DROP

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Cheers