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I am not with Laminar Research; just a flight simmer.
My memory seems to tell me from comments seen in earlier questions in this forum that this option is on the way. When?
In the meantime the following concept may be of some help which can be found at https://www.youtube.com/watch?v=laoDmpX-jSM
Also try this link which has a reference found in the manual. This link may be what I can remember seeing. The link is at http://questions.x-plane.com/13778/need-help-on-setting-a-multiplayer-lan-session-in-x-plane-11
Here is another link at http://questions.x-plane.com/5692/x-plane-11-multiplayer
The comments in the last two links made by Jennifer (jroberts) are from a Laminar Research staff member.
This link may give you some assistance as well. It is an alternative forum to this forum. It has a lot of good stuff whereby you have to use the search engine. Good for free add-ons as well as payware and donate ware. The latest link is https://forums.x-plane.org/index.php?/search/
This site is no longer being actively maintained.