Resetar todas as regras do Firewall do Linux

Limpa todas as regras

iptables -X

Seta as politicas padrão

iptables -P INPUT ACCEPT

iptables -P OUTPUT ACCEPT

iptables -P FORWARD ACCEPT

Faça o FLUSH das regras do Firewall

iptables -F INPUT

iptables -F OUTPUT

iptables -F FORWARD