Solved: GRC ShieldsUp! alternative... Need firewall port scanner solution

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johnhiro007

GRC ShieldsUp! alternative... Need firewall port scanner solution

Hello,

I need to test for any potential open ports on a firewall router. The test should be from outside the network, to simulate potential security concerns available to outside attackers.

1) https://www.grc.com/x/ne.dll?bh0bkyd2 scans only 1056 ports of a possible 65535. I would think we should check all posssible ports for a complete scan, right?

2) Please let me know if there are any websites/open source solutions that are trusted and actively used by you.

Please answer numbered questions with numbered responses.

Thank you!

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Tolomir🇩🇪

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johnhiro007

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Tolomir,

Thanks for the reply.

1) Can you respond to question 1.

2) Nmap; I have not set that up before. Have you used the online version at: http://hackertarget.com/nmap-online-port-scanner ? If not, can you try it and let me know how it compares to the NMAP you are used to using?

Thanks!

btan

1) before saying scanning all the ports....the main goal of port scanning is to ¿nd out which ports are open, which are closed, and which are ¿ltered. This will already tell us alot of the target host. As a whole, the goal of port scanning is to ¿nd out if a remote host is providing a service that is vulnerable e.g. to bu¿er over¿ow attack etc. Coming back, port scanning may involve all of the 65,535 ports or only the ports that are well-known to provide services vulnerable to di¿erent security-related exploits. The key is scanning is just a quick way to surface the low hanging ... Minimally the well-known so that unnecessary services can be averted from attacks...time is of essence for scanning too...

just my few cents

btan

This is another link for your info. No comparison but I see scanner with more option to create the packet for sieving the port state will help. Complementary to surface accuracy
http://www.brighthub.com/computing/smb-security/articles/34708.aspx

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Pete Long🇬🇧

Tolomir's sugestion of NMAP is by far the best option, If you want to see a ports open/ports closed status I've posted some simple code here

Pete

Jian An Lim🇦🇺

and again, most information is on the firewall/router. So if you have access to the firewall it does say everything you need.

nowadays, exploitation happens from inside rather than outside.

johnhiro007

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Hello,

it sounds like the best option is NMAP. Does anyone have experience with the website version I posted above?

Thanks

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johnhiro007

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btan

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btan

As for the feedback on GRC, I chanced upon this
http://jml.is/4444/shieldsup-analyzed

Jian An Lim🇦🇺

i remember angry ip scanner do the same job as well

http://www.angryip.org/w/Download

you can basically run this on a different network against the public IP address provided your firewall is not blocking outbound scan

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Abhineet 4 U

Go through here - This site has a vast information about the Total ports available and also the output... - https://nmapportscanner.info/nmap/

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