Please kindly use the following links to download the software and  VMs used in this course:

1.  VirtualBox. You can also download the version that I have specifically used which is 5.2.12

2.  Security Onion.

3. VirtualBox Guest Additions 5.2.12.

4. GNS3. You can also download the version that I have specifically used which is 2.1.9.

5. Wireshark. 

6. Kali Linux. 

7. Metasploitable 2.