I've had a quick look at systemd-networkd, and I don't think it would be significantly different to set up than netctl in your case. I think the problem was one of theory: I don't know how much reading you've done, but you need to understand some theory of the networking stack, network interfaces, bridges etc... before you can make a sensible configuration. I think that's beyond the scope of the documentation for most of these tools, although it would certainly make sense for the wiki to document some common use-cases.
Paul
I read a lot, especially when it comes to networking. As for me, it is the trickiest part of administrating my machine. I found many posts asking help about bridge, and I realized I was far from being the only one to have trouble with this notion. The more detailed WIKI I found about a correct bridge set up was on parabolagnulinux qemu wiki[1]. Usually Arch and parabola wiki are quite similar, but this time I found more info. I know systemd-networkd can be used for my container. For now, I am enjoying the container with netctl. I was not successful with networkd, as I do not fully understand the principle. I don't even know which profile for wich machine (host or container) ! I have a lot of work to do now on container, as it will be a test server for writing/deploying web apps. TY for your kindness and support. [1]https://wiki.parabolagnulinux.org/QEMU_Guide