What command is used for persistence in iptables configuration?

The command used for persistence in iptables configuration is iptables-save. This command is essential because it allows you to save the current configuration of the iptables rules to a file. Once the rules are saved, you can then restore them later using the corresponding command, typically iptables-restore. This is particularly important in situations where you want your firewall rules to persist across system reboots, ensuring that the same rules are applied every time the system starts.

By using iptables-save, administrators can easily manage and back up their firewall configurations, making it a crucial tool for maintaining consistent security settings in a Linux environment. It is worth noting that this functionality is key to achieving desired network security without having to manually reconfigure iptables rules after each reboot.