Reverse tunnel?

[Matt_Alexander]

Is it currently possible to create a reverse tunnel, like this?:

ssh -R 888:localhost:22 user@host

[yang (Yang.Y)]

Hi Matt, reverse port forwarding is supported, please refer to this post:

What is port forwarding, and how it works

Introduction Port forwarding via SSH (SSH tunneling) creates a secure connection between a local computer and a remote machine through which services can be relayed. Because the connection is encrypted, SSH tunneling is useful for transmitting information that uses an unencrypted protocol, such as IMAP, VNC, or IRC. Types of Port Forwarding SSH's port forwarding feature can smuggle various types of Internet traffic into or out of a network. This can be used to avoid network monitoring or sni…

Kindly Regards,

Yang

[mikael.fransson]

Easily done in several ways. One is as you described on the fly. Another is to use the ~/.ssh/config file. I wrote a blog about it here: https://www.ateam-oracle.com/simplify-your-day-with-ssh-config-file-entries-and-self-closing-tunnels

The cool thing with both Core Tunnel and Core Shell is that they can just reference these host aliases in the config file. This means you have basically one place for the details and depending on use case you can use the aliases anywhere on any terminal app and also in Core Shell and Core Tunnel

In ~/.ssh/config for the Core Tunnel in the screenshot below

Host vm2free
User ubuntu
HostName x.x.x.x
# typical database port for an Oracle database
LocalForward 1521 localhost:1521

Core Tunnel references this host alias and adds another port mapping. Maybe not what you would do but it shows the flexibility. When Core Tunnel connects both port mappings are active.

Thanks
Mikael