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Posted 5 Oct 2003

An Easy Firewall Application

, 9 Oct 2003
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Firewall application developed using Packet Filtering API.

Sample Image - firewallpapi.jpg


When I published my articles about firewall development, I received some e-mails about how to develop a complete firewall solution using the methods described. With this tool I want to give these users an easy example of packet filtering utility.

In this solution I have used Packet Filtering API for Microsoft Windows 2000 and above. I have developed a MFC class wrapper for this API. With this class, I make a simple MFC application that allows a user to set filter rules in local interfaces.

If you want to know more about Packet Filtering API, you can read my article Packet Filtering in .NET. Feel free to e-mail me if you want to know more about this application.

Update history

  • October 6, 2003.- Initial release. Version 1.0.
  • October 9, 2003.- Added support for "default action". Version 1.1.


This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here


About the Author

Jesus Oliva
Chief Technology Officer
Spain Spain
To summarize: learn, learn, learn... and then try to remember something I.... I don't Know what i have to remember...

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Comments and Discussions

GeneralFltdefs.h and Iphlpapi.h Pin
Member 14612587-Dec-07 2:09
memberMember 14612587-Dec-07 2:09 
GeneralPlease tell me why Pin
MD842-Jul-07 22:03
memberMD842-Jul-07 22:03 
GeneralRe: Please tell me why Pin
Manuel Soler (ModMa)4-Sep-07 11:21
memberManuel Soler (ModMa)4-Sep-07 11:21 
QuestionApplication name? Pin
Chemically Yours20-Jun-07 20:06
memberChemically Yours20-Jun-07 20:06 
Questionmfc application design? Pin
arefix8-Feb-07 20:40
memberarefix8-Feb-07 20:40 
GeneralCan't load DLL in other computer Pin
iManiac2-Feb-07 0:43
memberiManiac2-Feb-07 0:43 
GeneralWindows 98 Pin
Arkadiusz z Krakowa20-Dec-06 4:49
memberArkadiusz z Krakowa20-Dec-06 4:49 
Generalport filtering on LAN Pin
tasleem1438-Aug-06 1:25
membertasleem1438-Aug-06 1:25 
Generalcannt Filter port Pin
tasleem1438-Aug-06 0:39
membertasleem1438-Aug-06 0:39 
GeneralIf you know... Pin
Ralph Varjabedian29-Mar-06 21:14
memberRalph Varjabedian29-Mar-06 21:14 
Generalfor linux firewall design Pin
abhikamune4-Mar-06 6:14
memberabhikamune4-Mar-06 6:14 
GeneralRe: for linux firewall design Pin
Brad Bruce4-Mar-06 7:20
memberBrad Bruce4-Mar-06 7:20 
GeneralRe: for linux firewall design Pin
Amit45123-Jul-07 23:51
memberAmit45123-Jul-07 23:51 
GeneralFirewall in vnisual c++ Pin
the_enginer20-Feb-06 3:34
memberthe_enginer20-Feb-06 3:34 
Questionhow to drop packet Pin
eltaweel29-Jun-05 1:47
membereltaweel29-Jun-05 1:47 
Questioncan this app works in bluetooth connection? Pin
HuGo101121-Mar-05 4:27
memberHuGo101121-Mar-05 4:27 
AnswerRe: can this app works in bluetooth connection? Pin
Manir31-Jan-06 20:54
memberManir31-Jan-06 20:54 
GeneralAbout permitting some packet Pin
roversbig13-Jan-05 23:38
memberroversbig13-Jan-05 23:38 
GeneralRe: About permitting some packet Pin
Amit45123-Jul-07 23:54
memberAmit45123-Jul-07 23:54 
Generalpacket api Pin
Irish_GUI31-Mar-04 8:26
memberIrish_GUI31-Mar-04 8:26 
QuestionHow do I restore my setting after using this? Pin
biny2-Jan-04 19:06
memberbiny2-Jan-04 19:06 
AnswerRe: How do I restore my setting after using this? Pin
Jesús O.5-Jan-04 9:00
memberJesús O.5-Jan-04 9:00 
GeneralRe: How do I restore my setting after using this? Pin
biny5-Jan-04 21:45
memberbiny5-Jan-04 21:45 
GeneralA Firewall in C# Pin
palamr1-Jan-04 1:58
memberpalamr1-Jan-04 1:58 
GeneralRe: A Firewall in C# Pin
Jesús O.1-Jan-04 5:15
memberJesús O.1-Jan-04 5:15 

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