Iptables es el software de firewall de Linux por defecto utilizado en las distribuciones Linux. Si desea permitir o denegar el acceso a un puerto específico o dirección IP, se pueden agregar reglas de iptables a través de la línea de comandos que va a crear y aplicar las reglas de inmediato. Usted debe seguir un formato específico al añadir reglas para el programa iptables o no funcionará correctamente.
CONFIGURAR IPTABLES
Inicie sesión en su equipo Linux como usuario administrador (root).
Abra una ventana de terminal desde el menú del sistema.
Tipo "iptables-A INPUT-j ACCEPT-p tcp - destination-port 1234" para crear una nueva regla que permite el tráfico entrante en el puerto "1234" para acceder a la computadora.
Tipo "iptables-A OUTPUT-j DENY-p udp - destination-port 4567". "4567" para crear una nueva regla que niega el tráfico saliente de acceso a puerto
Tipo "iptables-D ENTRADA rule_number" para eliminar una regla del firewall con una regla número específico; "rule_number" en este ejemplo.
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