iptables example to allow ssh, and block every incoming http and https requests except certain ips

iptables-allow-ssh-http-https-from-certain-ip-but-block-all-others.sh

# allow incoming ssh access from anywhere
sudo iptables -A INPUT -p tcp --dport 22 -j ACCEPT

# allow incoming http & https requests from local
sudo iptables -A INPUT -p tcp --dport 80 -s 127.0.0.1 -j ACCEPT
sudo iptables -A INPUT -p tcp --dport 443 -s 127.0.0.1 -j ACCEPT

# allow incoming http & https requests from specific ips
sudo iptables -A INPUT -p tcp --dport 80 -s 13.250.120.208 -j ACCEPT
sudo iptables -A INPUT -p tcp --dport 443 -s 13.250.120.208 -j ACCEPT

# block other incoming http & https requests
sudo iptables -A INPUT -p tcp --dport 80 -j REJECT
sudo iptables -A INPUT -p tcp --dport 443 -j REJECT

# yum install iptables-services

# save and restart iptables
sudo service iptables save
sudo service iptables restart