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How To Block ALL PORTS

Posted on 2004-10-15
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Last Modified: 2012-05-05
I need some code that illustrates how to block all ports for a computer such that no (Zero) internet activity can occur. ( and then be able to turn them back on again, just like a Firewall blocking all ports).

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Question by:quantum2
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by:Sergio_Hdez
ID: 12319030
A hook on the TCP/IP stack calls? Just wondering...
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by:sftweng
ID: 12323855
Perhaps you could start here http://winpcap.polito.it/ or with the Windows DDK
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by:sftweng
ID: 12323897
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Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

 
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sftweng earned 125 total points
ID: 12324042
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by:TheRealLoki
ID: 12326698
if it's a lan connection, you could simply clear your gateway, so data can not route
(route delete 0.0.0.0)
and reset it after to your lan gateway
route add -p 0.0.0.0 mask 0.0.0.0 192.168.1.1 (if .1 is your router/gateway)
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by:quantum2
ID: 12355357
Hey Sftweng,
thanks for the links. This will help a great deal. If you are interested, I will give you 300 more points if you take the Winsockfirewall code and create an sample application that has the following.

one form, two buttons.

Button 1 - Block all traffic
Button 2 - Enable traffic

Thats it.

While I havent looked at this code in great detail, it would appear that this is as simple as assigning a IP range rule from 0.0.0.1 to 255.255.255.255

I got slammed at work and dont have time to weed through all of this, so if you are interested in creating a sample that uses their code and any libraries, all I would need is the units necessary to make the sample work as well as any components they are dependant on and the above listed functionality.

Thanks for the help

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