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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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What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

 
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sftweng earned 500 total points
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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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