Every now and then the question arises for me to link two Ethernet segments over some kind of outdoor wireless connection.
It is usually over comparatively short distances (at some places maybe some 20m, but once I needed 200m), within private premises, with direct visibility.
Most of the hardware I have seen, talk about using some form of 802.11 protocol. But I am getting confused, because the answers to a similar question here: Ethernet connection wireless bridge talk about utilizing a standard COTS WIFI bridge/router, which are generally inherently meant to be used for multiple connections to single AP.
What I want, is a direct point to point link from one single device to the other with (1) as little additional overhead as possible, and (2) for it to be as transparent (to the rest of Ethernet) as possible, and (3) with reasonable assurance that this link can be used only by those two endpoints. Essentially a wireless Ethernet wire.
There are devices which seem to do this kind of link, such as, eg, Ubiquiti LiteBeam, but I would like to understand:
(1) are there any reasonable alternatives to 802.11 protocol being used nowadays for such links?
(2) as the 802.11 is "a set of MAC and physical protocols", does it mean that these kinds of direct links can avoid the whole "acting as AP" that COTS WIFI routers do? I don't want a situation where people could theoretically connect to one or both ends of the link with their equipment -- the link is just for the endpoints.