Linux System Engineer: Networking and SSH

Introduction

• Demystify Linux networking and SSH
• What you should know
• OS installation
• Lab setup
• Install Guest Additions

1. Linux Networking Overview

• Consistent network naming with systemd
• About NetworkManager

2. Gather Network Information

• Get IP address, subnet mask, and default gateway
• Get system hostname
• Get network information from the GUI

3. Use Network Tools

• Ensure connectivity with ping
• Get network statistics with ss and ip
• Analyze ARP table with arp and ip
• Query DNS servers with dig

4. Change Live Network Configuration

• Change hostname
• Change IP address and subnet mask
• Change the default gateway
• Change DNS server

5. Change Saved Network Configuration

• Manual network interface configuration
• Edit system hosts file
• Configure networking using Network Manager
• Configure networking using the GUI

6. Secure Shell Overview

• SSH overview
• Installing SSH client and server
• Connecting to SSH from Windows
• Connecting to SSH from macOS and Linux
• Connecting to SSH from Android
• Connecting to SSH from iOS

7. Configure SSH

• Configure SSH clients
• Configure SSH servers
• SSH per user client files

8. SSH Security

• Passwordless logins using SSH
• Restricting root logins with SSH
• Restricting SSH logins by user and network

9. SSH Tips and Tricks

• Execute commands remotely using SSH
• Copy files across the network over SSH
• Optimize SSH for speed

Conclusion

• Next steps