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Network Sniffer

, 19 Jul 2004 CPOL
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Network Sniffer

Sample Image - Sniffer.jpg


A "Packet Sniffer" is a utility that sniffs without modifying the network's packets in any way. By comparison, a firewall sees all of a computer's packet traffic as well, but it has the ability to block and drop any packets that its programming dictates. Packet sniffers merely watch, display, and log this traffic.

One disturbingly powerful aspect of packet sniffers is their ability to place the hosting machine's network adapter into "promiscuous mode." Network adapters running in promiscuous mode receive not only the data directed to the machine hosting the sniffing software, but also ALL of the traffic on the physically connected local network.

I hope that this piece of code will help you understand the network better.


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Eran Aharonovich
Software Developer
Australia Australia
Been a programmer since 1999.
Experience in:
.Net, C++, C#, VB, VB.NET, ASP, ASP.NET, DLLs, COM etc.

Comments and Discussions

QuestionHow top begin writing a packet sniffer? Pinmembergrace4raghu227-Dec-04 4:42 
GeneralFeeto Pinsussfeeto27-Dec-04 3:46 
GeneralRe: Feeto PinsussAnonymous27-Dec-04 4:45 
GeneralHi PinmemberSanjit Rath1-Nov-04 4:21 
I have downloaded your article and given 5/5. I have understood most of them, but it would be quite good if you can elaborate on the following functions.
bool CSnifferDlg::ParseTCPPacket(const CString& source, const CString& destination, TCP_HDR* pTCPHeader, char* pData, unsigned long len )
and structure
struct Session
unsigned int sourcePort, destPort;
CString sourceIP, destIP;

Session* pOtherSide;
tcp_seq ISN;
DWORD len;
I will be grateful if you can give some links on the content. I am currently working on such a project. I am finding it hard to get information about the IP data grams and other headers. Also if any book on the subject that you can suggest will be helpful.

Thanking you,
Smile | :)
GeneralRe: Hi PinmemberEran Aharonovich25-Jul-05 1:22 
GeneralThe article Location Pinmembersergeyv20028-Sep-04 10:26 
GeneralRe: The article Location PinmemberEran Aharonovich30-Mar-05 6:33 
GeneralNice sniffer.. but.. PinmemberMichael Hendrickx21-Aug-04 3:49 
GeneralRe: Nice sniffer.. but.. PinmemberEran Aharonovich21-Aug-04 7:43 
GeneralRe: Nice sniffer.. but.. PinmemberMichael Hendrickx21-Aug-04 20:37 

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