iptables clear

Clear all policies in iptables.

-Z : reset the counter

-F : delete all rules (flush)

-X : delete all custom chains

The rules are cleaned and rebuilt as follows:

iptables -Z
iptables -t nat -F
iptables -t nat -X
iptables -t nat -P PREROUTING ACCEPT
iptables -t nat -P POSTROUTING ACCEPT
iptables -t nat -P OUTPUT ACCEPT
iptables -t mangle -F
iptables -t mangle -X
iptables -t mangle -P PREROUTING ACCEPT
iptables -t mangle -P INPUT ACCEPT
iptables -t mangle -P FORWARD ACCEPT
iptables -t mangle -P OUTPUT ACCEPT
iptables -t mangle -P POSTROUTING ACCEPT
iptables -F
iptables -X
iptables -P FORWARD ACCEPT
iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT
iptables -t raw -F
iptables -t raw -X
iptables -t raw -P PREROUTING ACCEPT
iptables -t raw -P OUTPUT ACCEPT

[1]. How to list and delete Iptables firewall rules. Jiang Zhi Notes. 2021. https://www.gingerdoc.com/tutorials/how-to-list-and-delete-iptables-firewall-rules