Before doing general cleaning iptables make sure you know how to configure it according to your needs
Clear CentOS/ Debian iptables rules .
The following command lines in the following order:
1. iptables-P INPUT ACCEPT 2. iptables-P FORWARD ACCEPT 3. iptables-P OUTPUT ACCEPT 4. iptables-F 5. iptables-X 6. iptables-t nat-F 7. iptables-t nat-X 8. iptables-t mangle-F 9. iptables-t mangle-X
-P (policy) = chain target
-Flush -F [chain] Delete all rules in the chain or all chains
-table table to manipulate (default: `filter ')
-X [chain] Delete and user-defined chain