How to create such a rule for iptables Centos 7?

Question

CentOS

Good day!
How to allow connection on port 22 on centos 7 server, for example from subnet 0.0.0.0/24?

Answer 1

iptables -A INPUT -p tcp --dport 22 -s 0.0.0.0/24 -j ACCEPT

You can also deny the connection to everyone except from the subnet:

iptables -A INPUT -p tcp --dport 22 -s !0.0.0.0/24 -j DROP