Duration: 10:18

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10

how to block a port on centos 7 with IPTABLES.

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in this video i will block SSH port (22) with IPTABLES.
steps :

1) install iptables with :
sudo yum install iptables-services

2) block port :
sudo iptables -I INPUT -p tcp --dport 22 -j REJECT

3) save iptables :
sudo service iptables save

4) try to connect to centos7 with ssh.
sudo ssh root@192.168.56.105

and you will see a message :
ssh: connect to host 192.168.56.105 port 22: Connection Refused.

yeah, port 22 is blocked! bingo!

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** to unblock port, type :
sudo iptables -D INPUT 1
sudo service iptables save