Web Reference: Aug 24, 2020 · In this tutorial, you learned how to save and restore iptables rules permanently on Linux, especially on Debian/Ubuntu or CentOS/RHEL/Rocky/Alma Linux servers. Remember to use only one service to configure the Linux firewall. While it is always a good idea to test a new iptables rule before committing it to the /etc/sysconfig/iptables file, it is possible to copy iptables rules into this file from another system's version of this file. This provides a quick way to distribute sets of iptables rules to multiple machines. This article explains several ways in which iptables rules can be stored permanently on Linux.
YouTube Excerpt: Ever wonder why your Linux firewall
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