Lab 18 — Using ipconfig to view and modify network information on Windows

Please follow these labs to get hands-on experience for CompTIA Security+ exam [SY0–601]. All the labs use free tools. NEVER configure these labs at work using your employers’ PCs.

Lab Objective:

Learn how to use ipconfig to view and modify network information on Windows.

Lab Purpose:

Ipconfig stands for Internet Protocol configuration. It is a console application which displays all current TCP/IP network configuration values and refreshes DHCP and DNS settings.

Lab Tool:

Windows

Lab Topology:

You can use Windows for this lab.

Lab Walkthrough:

Task 1:

We will begin by viewing the help information screen by executing the following command:

ipconfig /?

Open a command prompt to begin, and type “ipconfig” to view your networking information.

As you will see, there will be a lot of information shown, including your local IP addresses.

Task 2:

To display the fill TCP/IP configuration information for all network adapters, we can use the following command:

ipconfig /all

Task 3:

Assume that our machine has an IP address with DHCP. To release our current IPv4 or IPv6 address, we can use the following commands:

ipconfig /release

ipconfig /release6

Renew our IP addresses via DHCP:

ipconfig /renew

Task 4:

If we want to purge the DNS resolver cache, we can do that using the following command:

ipconfig /flushdns

This will essentially get rid of the local cache of DNS information.

Task 5:

We can also refresh all DHCP leases and re-register DNS names using the following command:

ipconfig /registerdns

You will need to run command prompt as administrator to execute this command.

Task 6:

We can display the content of the DNS Resolver Cache using the following command:

ipconfig /displaydns