I have looked in COMODO but cannot find this.
As you all (probably) know, most firewalls let you select “Stealth Mode”.
(( when in Stealth mode, others cannot see you. eg if they ping your IP address, they will not get a response.
eg with Agnitum’s Outpost firewall, if you enable “Stealth Mode” you can’t even ping yourself. Once you disable “Stealth Mode”, you can ping yourself ))
This is usually done via a button selection somewhere in the firewall’s configuration screens (as is the case with, for example, Agnitum’s Outpost firewall).
If your ports are CLOSED, when someone pings you, they get a response denying access. This indicates that there is a computer at that IP address but it’s not accepting incoming connections.
If your ports are STEALTHED,when someone pings you, they get no response at all. This indicates that there is a computer at that IP address and that it has a firewall that is dumping inbound unsolicited requests.
Either way, they know you’re there. The bad guys will, as a rule, move on and try and find an easier, unprotected target.