This post is an overview of the different tunneling options available in OpenSSH.
This is inteded as a reference to use when I am explaining
(every so often) how to use SSH for tunneling.
Some guidance about configuring/fixing domain name resolution
with a corporate Virtual Private Network (VPN),
especially OpenVPN and with systemd-based Linux systems.
This configuration uses the internal/private corporate resolvers
for resolving internal/private domain names
while using the ISP resolver for general domain names.
This might help if your VPN is struggling these days
because of the COVID-19 threat 😷.