Block or Allow port ranges using IPTables
You can use the IPTables to block a port range with a single statement, rather than writing the same line again and again.
Below is a simple example where I had blocked FTP ports 20 and 21 using a single line. Thus reducing my keystrokes.
iptables -A INPUT -m state –state NEW -m tcp -p tcp –dport 20:21 -j REJECT
Here is a step by step screenshot from my machine, for the tip.
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