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  1. #!/bin/bash
  2. # iptables.sh
  3. #
  4.  
  5. #política por defecto
  6. iptables -P INPUT DROP
  7. iptables -P FORWARD DROP
  8. iptables -P OUTPUT ACCEPT
  9.  
  10. #
  11. # Flush (-F) all specific rules
  12. #
  13. iptables -F INPUT
  14. iptables -F FORWARD
  15. iptables -F OUTPUT
  16.  
  17. #Conexiones establecidas
  18. iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
  19. iptables -A INPUT -i lo -j ACCEPT
  20.  
  21. #ping
  22. iptables -A INPUT -p icmp --icmp-type 8 -m conntrack --ctstate NEW,ESTABLISHED,RELATED -j ACCEPT
  23. iptables -A OUTPUT -p icmp --icmp-type 0 -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
  24.  
  25. #SSH
  26. iptables -A INPUT -p tcp --dport ssh -j ACCEPT
  27.  
  28. #HTTP
  29. iptables -A INPUT -p tcp --dport 80 -j ACCEPT
  30.  
  31. #FTP
  32. iptables -A INPUT -p tcp --dport 20 -j ACCEPT
  33. iptables -A INPUT -p tcp --dport 21 -j ACCEPT
  34. iptables -A INPUT -p tcp --dport 40110:40210 -j ACCEPT
');