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.