Hi, I am currently using the L2 tunnel feature of ssh between two Linux machines, and it works beautifully! As a result, I have come to prefer a workflow that uses an L2 tunnel, but I can't seem to find a long-term solution for this workflow on macOS. At the moment, tap devices on macOS can be generated using a kernel extension like tuntaposx <http://tuntaposx.sourceforge.net/>; however, all kernel extensions were deprecated recently and will likely be removed in a future macOS release this fall. An alternative to tap devices on macOS is something called a feth interface. Luckily, the ZeroTierOne project released a program <https://github.com/zerotier/ZeroTierOne/blob/master/osdep/MacEthernetTapAgent.c> which can interact with a feth interface through stdin and stdout. Since ssh uses file descriptors for all of its tunnels, I think a similar program could be used in the ssh sys_tun_open logic to interact with a feth interface on macOS. I have not yet gone far enough to try and integrate the ZeroTierOne code with my own ssh build, but I'm curious what thoughts others may have on this mailing list. One nice improvement of doing something like this in ssh would be removing the requirement for macOS user's to install an additional driver to enable L2 tunneling. Charles _______________________________________________ openssh-unix-dev mailing list openssh-unix-dev@xxxxxxxxxxx https://lists.mindrot.org/mailman/listinfo/openssh-unix-dev
