Hey, sorry if I interrupt, I was reviving my good old KT4 and ended up with a pretty nice idea.
I have a Calibre with OPDS and I use KOReader to connect to it and download my own epubs right into my kindle.
Turns out, that same server is connected to my Tailscale account, and I found this repo:
https://github.com/mitanshu7/tailscale_kual/issues/2
I was able to set it up right away (it appears listed on my devices, and tailscale ping works, ping from the server to the kindle works...) but I was not able to reach the server, turns out its a limitation of the Kernel, has to use a SOCKS5 proxy and its a mess but when I try to run it, the current kernel (4.15, running 5.17.1) tun.ko is not installed.
I am not that fluent compiling (i dont even have an environment ready at this moment) but if anybody could compile it, this would be a nice solution.
I have checked in the source code, the tun.c file is there so I believe it should not be a nightmare (IDK)
Thank you in advance for your help (the amount of hours your threads saved me already is huge).