NetDefender is a Free Firewall with source code, which can be downloaded along with firewall executables. Netdefender works only on windows 2000 and above versions of windows.

Netdefender has a very easy to use interface. NetDefender Firewall is completely written in VC++ 7.1 (Visual Studio 2003) using MFC , Windows API, Filter Hook Driver (Provided with Windows 2000).

Tools Used :



1) VC++ using MFC (Code can be compiled with either Visual Studio 2003 or 2005)

2) Windows API

3) Filter Hook Driver (Provided with Windows 2000)

Note: To run the Netdefender you must have mfc71u.dll, msvcp71.dll and amsvcr71.dll

Features :

1. User can Block all Traffic and can Allow all traffic
   through just one mouse click


2. It is a packet filtering Firewall.


3. User can add custom rules to this firewall as
   per their security requirements.


4. User can define rule based on source and destination
   IP, source and destination Port number and on Protocol
   used (IP,TCP,ICMP).


5. User can modify already added rules. (NEW in v 1.5)


6. User can Remove the already added Rules. (NEW in v 1.5)


7. A Port scanner is also provided to scan the system for
   open Ports.


8. Provides the list of applications that are currently trying to connect to outside network.


9. Proper help file is provided in case of any difficulty.(Yet to add)

Requirements :

1. Netdefender can only run on an OS higher than windows 2000 (i.e.
   Win 2000, Win Xp I hope Vista would not break anything)


2. User must has admin rights (i.e. must be member of administrator group ) on the system.


3. Default Firewall of windows Xp must not be running . In
   windows Xp with service pack 2 Default firewall is always
   running. So you need to stop it before running the Netdefender.