#Add firewall rules to block a port from any IP, except from local to a server
iptables -A INPUT -p tcp –dport 8443 -s 10.10.10.10 -d 10.10.10.10 -j ACCEPT
iptables -A INPUT -p tcp –dport 8443 -s 0.0.0.0/0 -j DROP
#Add firewall rules to block a port from a server to any IP, except the local one
iptables -A OUTPUT -p tcp –dport 8443 -s 10.10.10.10 -d 10.10.10.10 -j ACCEPT
iptables -A OUTPUT -p tcp –dport 8443 -s 0.0.0.0/0 -j DROP
#Save changes on iptables
/sbin/service iptables save
#Check the rules on iptables file
/sbin/iptables -L -n -v
iptables -L –line-numbers
#Start service
service iptables start
Start it permanently
chkconfig –level 345 iptables on
#Stop service
service iptables stop
Stop it permanently
chkconfig –level 345 iptables off
