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Save iptables rules and clear firewall

Useful for debugging.

First, save the current firewall config:

iptables-save > /root/firewall.rules
ip6tables-save > /root/firewall6.rules

Then, flush and open all the firewall rules using the following commands:

Order you execute the commands below matters! Otherwise you might lock yourself out of the machine.

iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X

For IPv6 rules, substitute ip6tables instead of iptables.

After testing, you can re-enable your firewall rules by running the following:

iptables-restore < /root/firewall.rules
ip6tables-restore < /root/firewall6.rules

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Save iptables rules and clear firewall

Tested on

See also

References