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Solution is in /etc/rancher/k3s/config.yaml

kubelet-arg:
    ◦ allowed-unsafe-sysctls=net.ipv4.ip_forward
    ◦ allowed-unsafe-sysctls=net.ipv4.conf.all.src_valid_mark
    ◦ allowed-unsafe-sysctls=net.ipv6.conf.all.disable_ipv6