$ unshare --user --map-root-user --net --mount
[root@incensed-gawain ~]# echo $$
2646
Let's say we have a few test machines sitting behind a workstation router
Assuming the 'router' will forward traffic out, we can facilitate SSH'ing 'directly' to a test machine beind the router by leveraging reverse tunneling:
ssh -f -N -R 19999:localhost:22 <username>@<users host>
where: