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1. PACKET SNIFFER TOOL
INTRODUCTION
Today's networks are increasingly employing "switch" technology, preventing this
technique from being as successful as in the past. It is still useful, though, as it is
becoming increasingly easy to install remote sniffing programs on servers and
routers, through which a lot of traffic flows.
Packet sniffing is a form of wire-tap applied to computer networks instead of phone
networks. It came into vogue with Ethernet, which is known as a "shared medium"
network.
This means that traffic on a segment passes by all hosts attached to that segment.
Ethernet cards have a filter that prevents the host machine from seeing the traffic
addressed to other stations. Sniffing programs turn off the filter, and thus see
every ones traffic.
Today's networks may already contain built-in sniffing modules. Most hubs support
the RMON standard, which allow the intruder to sniff remotely using SNMP, which
has weak authentication.
Many corporations employ Network Associates "Distributed Sniffer Servers", which
are set up with easy to guess passwords. Windows NT machines often have a
"Network Monitoring Agent" installed, which again allows for remote sniffing.
Packets sniffing is difficult to detect, but it can be done. But the difficulty of the
solution means that in practice, it is rarely done.
A dedicated device designed for the purpose of monitoring network traffic in order
to recognize and decode certain packets of interest.
A software package that enables a general-purpose computer to recognize and
decode certain packets of interest. The packet sniffer is normally used by system
administrators for network management and diagnostics.
A program and/or device that monitors data traveling over a network. Sniffers can
be used both for legitimate network management functions and for stealing
information off a network.
Unauthorized sniffers can be extremely dangerous to a network's security because
they are virtually impossible to detect and can be inserted almost anywhere. On
TCP/IP networks, where they sniff packets, they're often called packet sniffers.
Packet sniffing is listening (with software) to the raw network device for packets
that interest the user. When the user’s software sees a packet that fits certain
criteria, it logs it to a file. The most common criteria for an interesting packet is one
that contains words like "login" or "password."
There are lots of existing packet sniffers, but all the existing ones have a demerit in
terms of allowing only specific types of sniffers. We need a generic sniffer. Hence
we are proposing to develop the same.

2. AIM/OBJECTIVE OF THE SYSTEM
The aim of the proposed system is to develop a JAVA based sniffer,
which can handle the necessary packets and also analyze the network
traffic.
PROPOSED SYSTEM
PROPOSED SOFTWARE REQUIREMENTS
Operating system : Windows 2000 Server and Client
Software : JSDK, Java 1.4 or higher
Web server : Suitable web server/web logic/Tom Cat
Database : Oracle 8i
PROPOSED HARDWARE REQUIREMENTS
Processor : P III 866 MHZ or above server and client
RAM : 128 MB or above
HDD : 80 GB Seagate or above
FDD : 1.44 MB or above
Monitor : Color or any compatible monitor
CD Drive, Keyboard, Mouse, ATX cabinet
PROPOSED SYSTEM DESCRIPTION
"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. Packet sniffer acts as a spying tool.
The popularity of packet sniffing stems from the fact that it
sees everything.
TYPICAL ITEMS SNIFFED INCLUDE
SMTP, POP, IMAP traffic
Allows intruder to read the actual e-mail.
POP, IMAP, HTTP Basic, Telnet authentication

3. Reads passwords off the wire in clear-text.
SMB, NFS, FTP traffic
Reads files of the wire.
SQL databse
Reads financial transactions and credit card numbers.
Not only can sniffing read information that helps break into a system, it is an
intrusion by itself because it reads the very files the intruder is interested in.
This technique can be combined with active transmission for even more effective
attacks.
Its a cruel irony in information security that many of the features that make using
computers easier or more efficient and the tools used to protect and secure the
network can also be used to exploit and compromise the same computers and
networks. This is the case with packet sniffing.
A packet sniffer, sometimes referred to as a network monitor or network analyzer,
can be used legitimately by a network or system administrator to monitor and
troubleshoot network traffic.
Using the information captured by the packet sniffer an administrator can identify
erroneous packets and use the data to pinpoint bottlenecks and help maintain
efficient network data transmission.
In its simple form a packet sniffer simply captures all of the packets of data that
pass through a given network interface.
Typically, the packet sniffer would only capture packets that were intended for the
machine in question.
A packet sniffer can only capture packet information within a given subnet. So, its
not possible for a malicious attacker to place a packet sniffer on their home ISP
network and capture network traffic from inside our corporate network.
In order to do so, the packet sniffer needs to be running on a computer that is
inside the corporate network as well.
PROPOSED SYSTEM FEATURES
Captures the network traffic
Analyzes the packets received
Monitors the traffic
Logs the data
Classify the packets
Bandwidth limitation

4. PROPOSED SYSTEM MODULES
CLIENT MODULES SERVER MODULES
1. CLIENT MANAGEMENT 1. SERVER MANAGEMENT
Client login / Client registration Server authentication
Client password change Server –client registration
completion
Authenticate Client password
2. SERVER CONNECTION change
ESTABLISHMENT
File transfer request 2. SERVER CONNECTION
File transfer process ESTABLISHMENT
File transfer response
File transfer reception
3. PEER - PEER CONNECTION
File transfer request
3. AUTHENTICATE PEER-PEER
File transfer process CONNECTION
4. PORT SCANNER
4. PORT LISTENER
5. PACKET ANALYZER
5. PACKET SNIFFING Packet classification
Packet type storage
6. PACKET FILTERING Set Packet filtering
Bandwidth allocation and
maintenance
7. BANDWIDTH ALLOCATION
Log file maintenance
8. LOG FILE TRACKING 6. REPORTS