What is the difference between iptables and iptables.old in centos?

  linux, question

As the topic is.
These two files are found, so which file configuration information is actually used by the system?

Iptables are used. ipttables.old can be deleted. when you modify the firewall configuration by command, you will find that ipttables.old has been regenerated, so ipttables.old is used for backup