ITSecurity Training

Test Your Firewall With 3 Free Scans

There are ways for you to check your own firewall/router that you connect to:

This is a free service that does a quick basic scan

https://www.grc.com/x/ne.dll?bh0bkyd2

here is my firewall being queried:

firewallquerydenied

 

 

here is also a great site which allows you to see what your own website or DNS is giving out to the world at large:

http://www.subnetonline.com/pages/network-tools.php

 

Here is the Online Port Scanner from subnetonline:

http://www.subnetonline.com/pages/network-tools/online-port-scanner.php

There are also many port scan response codes in case you are interested as well.

 

How about this site http://www.auditmypc.com/firewall-test.asp

 

Also how about this testing page:

http://www.securityspace.com/smysecure/index.html

 

 

Those are the 4 free scanners, and with a free scanner your mileage will vary.  I added an extra one in case there were problems with one.

Did you know there are 65536 ports? the reason is that 2 bytes are used for the number of the port being used in each packet. If there are 2^16 numbers of ports(which is equal to 65536)

Not all ports are normally in use, but there are some that are not frequently used.

 

So if you do not do a FULL scan manually with nmap or even use a properly scripted netcat with open ports then these “automated” scans may not be worth much – but no suprise with free stuff.

 

 

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