Networking

Contents

• Networking
  • SSH
    • Installation
    • Usage
    • File Transfer
    • Authentication
    • Mounting SSH
  • Netstat

SSH

• simple Installation
• remote shell
• file transfer
• secure
• standard
• http://en.wikipedia.org/wiki/Secure_Shell

Installation

The client is already installed. To install the server:

wajig install openssh-server

Usage

Connect to host notebook:

ssh notebook

File Transfer

In Krusader (File Manager)‘s/Dolphin’s/<your-graphical-filemanager-name-here> address bar, type:

sftp://notebook

To merely copy a file:

scp notebook:myfile .  # copies /home/me/myfile on notebook to current working directory
scp notebook:/etc/passwd .  # copies /etc/passwd on notebook to current working directory

Authentication

Either with username/password or through public key encryption. The latter is very easy to setup and even lets you skip the password prompt (if you choose an empty password).

Assumption: working on desktop, connecting to notebook:

ssh-keygen  # only if you haven't done it already
            # leave default
ssh-copy-id notebook
ssh notebook

If you chose an empty password and desktop gets compromised, then notebook will be too.

Mounting SSH

Prerequisites:

sshfs

Mounting:

sshfs remotehost: /local/dir/

Unmounting:

fusermount -u /local/dir/

See this Ubuntu wiki page for more details.

Netstat

To get all open ports:

netstat -an