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GRC test results are different with windows & ZA firewalls??


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#1 allstock

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Posted 06 November 2014 - 10:55 PM

I'm not computer literate as most here so bear with me. I was checking security of my ip via GRC and failed miserably. However, after reading several forums I've learned that there is an external IP that is being tested and not the one for my router??

 

My question is: When I changed turned off my ZA free firewall and switched back to windows 7 offered firewall I actually gained a couple ports being stealthed(still failed miserably with pings and all) that I didn't have when ZA was activated.

 

Technically this shouldn't even happen and there should be no difference since the external IP is the one being scanned, am I correct???

 

 



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#2 Didier Stevens

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Posted 07 November 2014 - 01:18 PM

Your router/modem that connects you to the Internet has (at least) 2 IP addresses: the public IP address (connected to the Internet) and the private IP address (connected to your LAN).

 

GRC is scanning the network interface with the public IP address of your router.

 

Disabling/switching firewalls on your machine should not make a difference in the results of GRC, except when your router has port-forwarding to your machine enabled.


Didier Stevens
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#3 allstock

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Posted 08 November 2014 - 08:21 AM

Thank you for enlightening me on the topic.



#4 Didier Stevens

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Posted 08 November 2014 - 11:40 AM

You're welcome.


Didier Stevens
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SANS ISC Senior Handler
Microsoft MVP 2011-2016 Consumer Security, Windows Insider MVP 2016-2019
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If you send me messages, per Bleeping Computer's Forum policy, I will not engage in a conversation, but try to answer your question in the relevant forum post. If you don't want this, don't send me messages.

 

Stevens' law: "As an online security discussion grows longer, the probability of a reference to BadUSB approaches 1.0"





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