The OpenSSH client has a lot of very powerful features for tunneling applications through a SSH connections and is one of my favorite tools for quick-and-dirty network plumbing tasks. It can be very useful for fixing/bypassing connectivity issues (caused by NATs, firewalls), accessing internal networks. 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.
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Some notes about using the TUN/TAP interface, especially on Linux.
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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 😷.
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A simple way to create IP over UDP tunnels using socat
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