Running Iptables on RHEL 8

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Has anyone tried running Iptables on RHEL 8? I know there are nftables and firewalld but I am trying to find out if anyone tried running Iptables it on 8.

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You can, the tools exist, but be aware that "iptables" on RHEL8 is actually using the kernel's nft framework in the background. The old iptables netfilter framework is avoided wherever possible. The RHEL 8.0 Release Notes explain it a bit, search text for "iptables".

For future-proofing, you might wish to make the move to nftables now. A tool to convert iptables rules to nftables rules is provided.