STEALTH "DROP" Port, Ports In IPTables Firewall

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STEALTH "DROP" Port, Ports in IPTables firewall.

By stealth, it means the port is closed for connections and will not respond at all, so if for example you have a FTP-server and want to block the port 21, then you type the following command in a terminal window.

STEALTH "DROP" Port, Ports in IPTables firewall.

Command:

iptables -A INPUT -s 12.34.56.0/24 -m tcp --dport 21 -j DROP

To open up the port again, simply change DROP to ALLOW.

 

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