Lab 18: IPv4 and IPv6

Objective Focus

Manage basic networking: Configure IPv4 and IPv6 addresses

Networking Introduction

Now, this objective is where some experience beforehand is very helpful.

To begin, the idea of a network is creating a link to allow communication between two or more devices. IPv4 and IPv6 stands for Internet Protocol Version 4/6. Internet protocol addresses is how devices can communicate data and resources.

Understand that computers use IPs similar to how we use addresses to mail envelopes and packages. Watch this video for more in-depth info on IP addresses. I also liked this one.

The table below provides some quick points.

	IPv4	IPv6
Address Format	Dotted decimal - 192.168.1.1	Colon-separated hexadecimal - 2001:0db8:85a3:0000:0000:8a2e:0370:7334
History	Developed in the 1970s, deployed in the 1980s. Became the backbone of the early internet.	Developed in the 1990s as a successor to IPv4 due to address exhaustion concerns. Gradual deployment began in the 2000s, with increasing adoption in recent years.
$ ip a	inet 192.168.122.93/24	inet6 fe80::5054:ff:feb5:d2bb/64

Using $ ip

$ man ip

ip - show / manipulate routing, network devices, interfaces and tunnels

$ ip addr

We can also use a simpler $ ip a for the same result. This will show the current settings on the computer.

$ ip neigh show

$ ip route

Please any changes by with $ ip command are temporary. We focus on nmcli and nmtui for changes that survive a reboot.

ip is still great for information gathering!

Using $ nmcli

$ man nmcli

Command-line tool for controlling NetworkManager

$ systemctl status NetworkManager

Check status of the service that manages the network connections. We’ll talk more about this service in a later lab

$ nmcli device status

$ nmcli con show *enp1s0*

$ nmcli con del enp1s0

Using $ nmtui

$ man nmtui

Text User Interface for controlling NetworkManager

$ nmtui

nmtui is my preferred method of changing settings. The command nmcli is great but time is a scarce resource during the exam and nmcli can be too slow for simple configuration changes.

Troubleshoot

Ping and Traceroute

$ ping 8.8.8.8

send ICMP ECHO_REQUEST to network hosts

$ traceroute 8.8.8.8

print the route packets trace to network host

Practice

To practice, update the ip address of the VM to another in the same subnet.

That is it for this lab, be sure to explore the man pages for examples!