How can I make my PC invisible

Comodo Internet Security - CIS Firewall Help - CIS
#1

Hi

I’m new at this program and I was using ESET Smart Security

with ESET I was able to make my PC invisible in the network (university dorms) except for my friends by adding their IP addresses as a trusted zone

with COMODO I was able to get the invisible part done but with a big problem

the firewall kept asking me for every IP that tried to access my PC whether I want to block it or allow it

the question is

how can I block the entire compos with one step instead of going through every IP?

#2

Open CIS>Firewall>Common Tasks>Stealth Ports Wizard

You can either set is as Block all incoming connections stealth ports to every one (third option)

or

First one giving the ip addresses you want to trust.