Port Forwarding and Shell Login Essentials

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Presentation transcript:

Port Forwarding and Shell Login Essentials lctseng

The Console Screen you see when installing the system

The Console The monitor of a computer Enter commands by your hands No interaction with your host OS Host OS: running VirtualBox/VMware No select, copy, paste, etc.

Using Remote Shell Login Using Putty A secure shell login(ssh) client Allows you to login into Unix-like system Like connecting to with CS workstations

Using Remote Shell Login After proper configuration

Using Remote Shell Login Interactions: select, copy, paste, etc. Copy commands from your screen Copy some long commands from other place Change the appearance Fonts, opacity, encoding, etc. Display non-ASCII characters E.g. Chinese Allow from remote login Don’t need to bring your computer going around Text interface only No GUI, X windows, …

Using Remote Shell Login: Architecture Connect to CS workstation No problem SSH connection (140.113.235.135) (TCP 22 port) Putty (your computer) bsd5.cs.nctu.edu.tw

Using Remote Shell Login: Architecture Connect to your own VMs Connect to which host? VM 1 VM 3 VM 2 22 port ? 22 port SSH connection (127.0.0.1) (TCP ?? port) Putty (Host OS) 22 port

Port Forwarding Create an internal table Specific which port match which VM VM 1 VM 3 VM 2 22 port TCP 8022 port TCP 9022 port 22 port TCP 10022 port Putty (Host OS) 22 port Usage Host IP Host port VM VM port SSH #1 127.0.0.1 8022 VM 1 22 SSH #2 9022 VM 2 SSH #3 10022 VM 3

Setup Port Forwarding in VirtualBox What we want: Open a port to connect to VM’s TCP 22 port Choose an unused port and pair them Some versions of VirtualBox need only one entry (specific no IP) For remote connection For local connection only (safer)

Setup Port Forwarding in VirtualBox Local connection After setting an entry with IP 127.0.0.1 (assume port = 8022)

Setup Port Forwarding in VirtualBox Local connection Now you can login into your VM

Setup Port Forwarding in VirtualBox Remote connection After setting an entry with IP 140.113.89.1 (assume port = 8022)

Setup Port Forwarding in VirtualBox Remote connection problems Connection refused Connection timeout Firewall Allow 8022/9022/<ports you set> for inbound traffic Turn off firewall DANGER!! DO ON YOUR OWN RISK!