How to block all ports except port 21,22,80,8080 ???

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To: "" <netfilter@xxxxxxxxxx>
Subject: How to block all ports except port 21,22,80,8080 ???
From: "jacob_chan" <jacob_chan@xxxxxxxxxxxxx>
Date: Tue, 18 Feb 2003 16:12:19 +0800 (CST)
Cc: "" <tashamaillist@xxxxxxxxx>, "" <netfilter@xxxxxxxxxxxxxxxxxxx>
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Sender: netfilter-admin@xxxxxxxxxxxxxxxxxxx

How to block all ports except port 21,22,80,8080 ???

Dear all,

I want to block all ports except port 21,22,80,8080.

Any help appreciated.

Best regards,

Jacob

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