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iptables has two kernel backends, legacy and nft. Quoting https://developers.redhat.com/blog/2020/08/18/iptables-the-two-variants-and-their-relationship-with-nftables > It is also important to note that while iptables-nft > can supplant iptables-legacy, you should never use them simultaneously. However, we don't want to block the node operations because of this reason, as there is no enough evidence this is causing big issues in the wild, so we just signal and warn about this situation. Once we have more information we can revisit this decision and keep it as is or move it to permanent.