Configuration for iptables

iptables.sh

iptables -F                                                                                                                                                                                                        
iptables -X                                                                                                                                                                                                        
iptables -t nat -F                                                                                                                                                                                                 
iptables -t nat -X                                                                                                                                                                                                 
iptables -t mangle -F                                                                                                                                                                                              
iptables -t mangle -X                                                                                                                                                                                              
iptables -P INPUT DROP                                                                                                                                                                                             
iptables -P FORWARD DROP                                                                                                                                                                                           
iptables -P OUTPUT ACCEPT                                                                                                                                                                                          
iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT                                                                                                                                             
iptables -A OUTPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT                                                                                                                                            
iptables -t filter -A INPUT -i lo -j ACCEPT                                                                                                                                                                        
iptables -t filter -A OUTPUT -o lo -j ACCEPT                                                                                                                                                                       
iptables -t filter -A INPUT -p icmp -m limit --limit 5/second -j ACCEPT                                                                                                                                            
iptables -t filter -A OUTPUT -p icmp -j ACCEPT                                                                                                                                                                     
iptables -A FORWARD -o lo -j ACCEPT                                                                                                                                                                                
iptables -t filter -A INPUT -p tcp --dport 22 -j ACCEPT