modprobe ip_tables
modprobe iptable_filter
modprobe iptable_nat
modprobe ip_conntrack
modprobe ip_conntrack_ftp
modprobe ip_nat_ftp
modprobe ipt_state
Close: firewalld
systemctl stop firewalld
systemctl disable firewalld
Open the firewall service
[root@firewalld ~]# systemctl start iptables.service [root@firewalld ~]# systemctl enable iptables.service Created symlink from /etc/systemd/system/basic.target.wants/iptables.service to /usr/lib/systemd/system/iptables.service.
The default rule is clear:
== -F iptables> - flush: clear all the rules, not the default rule iptables - the X-: delete user-defined chain iptables -Z: chain counter is cleared
Prohibit access to port 22:
[root@firewalld ~]# iptables -A INPUT -p tcp --dport 22 -j DROP
Delete a rule set:
