#$1$Setup two Kali machines, denoted by Kali$1$ and Kali$2$ in VirtualBox with the configuration as follows:

Machine$|$ IP $|$NMask $|$Gateway

Kali$1|10\mathrm{.}0\mathrm{.}2\mathrm{.}20|255\mathrm{.}255\mathrm{.}255\mathrm{.}0|10\mathrm{.}0\mathrm{.}2\mathrm{.}2$

Kali$2|10\mathrm{.}0\mathrm{.}2\mathrm{.}21|255\mathrm{.}255\mathrm{.}255\mathrm{.}0|10\mathrm{.}0\mathrm{.}2\mathrm{.}2$

I. Discover the ports opening on Kali$1$ by using the nmap on Kali$2$

II$.$ Use UFW on Kali$1$ to stop all ports, except for $80/$tcp

III. Check the port status on Kali$1$ by using the nmap on Kali$2$ to scan Kali$1.$