I run Comodo firewall on both the main pc (wired) and laptop (wireless) with Linksys router.
The Gibson Research Shields Up tests show my computers as stealth.
http://www.grc.com/su-firewalls.htm
Mine does too. I live in an apartment complex with several wireless networks surrounding me. I get pArANoId about someone trying to leech into my network here at home.
I think he’s wanting to secure his wireless router. Your links help him secure his PC, which should be done too.