Ejemplos de reglas para IPtables

Aqui os dejo unos ejemplos de configuración de reglas para IPtables, encontraréis más en la siguiente web:

http://danieldegraaf.afraid.org/info/iptables/examples

Accept-all policy (Aceptar todo)

#!/usr/bin/env iptables-restore
*nat
:PREROUTING ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
COMMIT
*mangle
:PREROUTING ACCEPT [0:0]
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
COMMIT
*filter
:FORWARD ACCEPT [0:0]
:INPUT ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
COMMIT
*raw
:PREROUTING ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
COMMIT

Minima:

#!/usr/bin/env iptables-restore
*filter
:FORWARD DROP [0:0]
:INPUT DROP [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -i lo -j ACCEPT
COMMIT

Aceptar SSH para un solo host:

#!/usr/bin/env iptables-restore
*filter
:FORWARD DROP [0:0]
:INPUT DROP [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -s 1.8.9.7 -p tcp --dport 22 -j ACCEPT
COMMIT

Muchas más en el enlace mencionado anteriormente.

iptables example rulesets