firewalld¶

have a look at https://www.certdepot.net/rhel7-get-started-firewalld/

to forward a specific port (not yet working!)

firewall-cmd --zone=public --permanent --add-port=2222/tcp
firewall-cmd --zone=public --add-masquerade --permanent
firewall-cmd --zone=public --add-forward-port=port=2222:proto=tcp:toport=22:toaddr=192.168.122.80 --permanent
firewall-cmd --reload
firewall-cmd --zone=public --list-all

Testing¶

you may consider http://portquiz.net/

http://portquiz.net:1234/

This example tests whether you are able to visit outbound port 1234. You simply change the port number to whatever you like. Also, the site gives some examples that could be used in a command line script:

wget -qO- portquiz.net:1234 

Port 1234 test successful!
Your IP: 198.252.206.16