I have a firewall config running on a Leap 42.3 laptop.
I have installed leap 15.0 on a new laptop.
How can I import the susefirewall2 config to the leap 15.0 machine?

I have installed the package susefirewall2-to-firewalld, put the file susefirewall2 from the 42.3 machine to the leap 15 machine.
The script susefirewall2-to-firewalld failed due to an error relative to ip6tables >= 1.4.20, but my current version leap 15 is 1.6.21
Any help is welcome.