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See https://docs.k3s.io/advanced#additional-preparation-for-debian-buster-based-distributions

Thanks, but in the docs I read its for "Debian Buster" I am running Debian Bullseye

What version of the iptables do you have though? It applies to every OS that is running version 1.8.0-1.8.4

I did a clean installation of Debian 11 and looks like there is no iptables packages installed at all.

which iptables

gives me no result. Is Iptables required for K3s?

Then you are fine, K3s bundles its own version of iptables, its just using that

Ok thanks! so then I just ignore these 6 FAIL messages

Yeah you can ignore those 6 FAILS. If you want to see all the iptables rules that k3s makes, you can always use

sudo /var/lib/rancher/k3s/data/current/bin/aux/iptables -L

. This would be a good thing to improve IMO about the k3s check-config. I think a warning about "k3s is using embedded iptables" would be better than 6 FAILS.