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Blocking Access To Port For All Ips Except One

Posted on Tuesday 3rd March 2020

Using the following command you can block all incoming requests to a specific port for all ip's except the one specified

iptables -I INPUT -p tcp ! -s YOURIPADDRESS --dport PORT -j DROP

An example would be blocking mailcatcher's port 1080 from outside parties

iptables -I INPUT -p tcp ! -s --dport 1080 -j DROP