Linux iptables firewall settings FAQ (1)

◆ Title List project: firewall configuration problems on the local machine

1. How can I query my current iptables configuration settings?

2. How do I disable the firewall configuration of Linux Distro and disable clearing rules?

3. About firewall configuration of RedHat 9, Fedora and RHEL

4. How do I manually clear and reset iptables firewall rule?

5. What is the flowchart of iptables firewall packet comparison and judgment?

6. What are the rules for iptables firewall packet comparison?

7. Why is the host itself unable to access external hosts due to the use of-p input drop?

8. is the use of-p input drop limiting access to services on the local machine?

9. The network access caused by the use of-p input drop is normal, but the ftp connection fails?

10. What is the network failure caused by the use of-p output drop?

11. Is it recommended that the firewall Service of the local machine be only open to external projects, and other prohibited configuration methods?

◆ Title List project: NAT service configuration problems"

1. What is the configuration Syntax of a single purified NAT service?

2. What is the ftp connection Access Error for an internal ip host that accesses the Internet through NAT?

3. How can I configure a connection to an external Port on the NAT host to be transferred to an internal host?

. What is the difference between using-j MASQUERADE and-j SNAT in NAT?