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Warning: iptables-legacy tables present, use iptables-legacy-save to see them

cn flag

I am calling some iptables rules from a docker container that runs with NET_ADMIN which means iptables commands from the container are applied on the host (yes, I need them this way).

When checking the host with iptables-save I see no rules being added but I also see a Warning: iptables-legacy tables present, use iptables-legacy-save to see them and, when running iptables-legacy-save I can see my rules that are set by the container.

My question is as follows. Are these rules active even if present in the legacy table? Can I do something better?

Container is alpine 3.15, host is debian 10 Buster. Ideally I would want this container to be able to run on ubuntu and debian, regardless of versions.

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cl flag
A.B
Check this so you understand what's the matter: https://wiki.debian.org/iptables#Current_status
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