Internet Security ECOM 5347 Lab 1 Sniffing. Sniffing. Become aware of a class of vulnerabilities known as sniffing. Learn how to use a sniffer tool.

Size: px
Start display at page:

Download "Internet Security ECOM 5347 Lab 1 Sniffing. Sniffing. Become aware of a class of vulnerabilities known as sniffing. Learn how to use a sniffer tool."

Transcription

1 Objectives Sniffing Become aware of a class of vulnerabilities known as sniffing. Learn how to use a sniffer tool. What is a packet sniffer? Sniffing is eavesdropping on the network and A packet sniffer is a piece of software that grabs all of the traffic flowing into and out of a computer attached to a network. They are available for several platforms in both commercial and opensource variations. Some of simplest packages are actually quite easy to implement in C or Perl, use a command line interface and dump captured data to the screen. More complex projects use a GUI, graph traffic statistics, track multiple sessions and offer several configuration options. Sniffers are also the engines for other programs. Intrusion Detection Systems (IDS) use sniffers to match packets against a rule-set designed to flag anything malicious or strange. Uses of a packet sniffer Sniffing programs are found in two forms. Commercial packet sniffers are used to help maintain networks and to demonstrate the insecurity of plaintext network protocols, while underground packet sniffers are used by attackers to gain unauthorized access to remote hosts, as an example capturing the passwords used in telnet, rlogin and ftp connections. Sniffing methods There are three types of sniffing methods. Some methods work in nonswitched networks while others work in switched networks. The sniffing methods are: IP-based sniffing, MAC-based sniffing, and ARP-based sniffing. 1. IP-based sniffing This is the original way of packet sniffing. It works by putting the network card into promiscuous mode and sniffing all packets matching the IP address filter. Normally, the IP address filter isn t set so it can capture all the packets. This method only works in non-switched networks. 2. MAC-based sniffing This method works by putting the network card into promiscuous mode and sniffing all packets matching the MAC address filter. 4

2 3. ARP-based sniffing This method works a little different. It doesn t put the network card into promiscuous mode. This isn t necessary because ARP packets will be sent to us. This happens because the ARP protocol is stateless. Because of this, sniffing can be done on a switched network. To perform this kind of sniffing, you first have to poison the ARP cache1 of the two hosts that you want to sniff, identifying yourself as the other host in the connection. Once the ARP caches are poisoned, the two hosts start their connection, but instead of sending the traffic directly to the other host it gets sent to us. We then log the traffic and forward it to the real intended host on the other side of the connection. This is called a man-in-the-middle attack. See Diagram 1 for a general idea of the way it works. A sniffer program makes the network interface card (NIC) on the machine S enter into a so-called promiscuous mode. An Ethernet NIC is built with a "filter" that ignores all traffic that does not belong to it, i.e., it ignores all frames whose destination MAC address does not match with its own. Through the NICs driver, a sniffer turns off this filter, putting the NIC into promiscuous mode. the defense against sniffing is not really prevention but providing security solutions so that even if large amounts of data is sniffed, not much use can be made out of it. This is the major reason behind one-time passwords and encryption. Capabilities of Sniffers A sniffer program allows a user to watch all network traffic over any network interfaces connected to the host machine. A sniffer program can watch TCP, IP, UDP, ICMP, ARP, RARP. A sniffer also lets you watch port specific traffic for monitoring http, ftp, telnet, etc. traffic. 5

3 A sniffer can intercept packets from a target host (or all hosts) on the LAN intended for another host on the LAN by forging ARP replies. This is an extremely effective way of sniffing traffic on a switch. Kernel IP forwarding must be turned on ahead of time for this capability. determine the local gateway of an unknown network via passive sniffing. flood the local network with random MAC addresses (causing some switches to fail open in repeating mode, facilitating sniffing). This is no longer passive/ silent sniffing. become a simple password sniffer by minimally parsing each application protocol, and saving the "interesting" pieces. output all requested URLs sniffed from HTTP traffic in CLF (Common Log Format, used by almost all web servers, suitable for offline post-processing with log analysis tools. send URLs sniffed from a client to local web browser for display, updated in real-time (that is, as the target surfs, the local browser surfs along). Examples of Sniffers 1. tcpdump 2. wireshark/ethereal: 3. hunt 4. ettercap: Ettercap is a network sniffer for switched LANs. It uses ARP poisoning and the man-in-the-middle technique to sniff all the connections between two hosts. It can inject characters to server (emulating commands) or to client (emulating replies) while maintaining an established TCP connection. 5. dsniff 6. sniffi. Detection of Sniffers 1. The DNS Test In this method, the detection tool itself is in promiscuous mode. We create numerous fake TCP connections on our network segment, expecting a poorly written sniffer to pick up on those connections and resolve the IP addresses of the nonexistent hosts. Some packet sniffers perform reverse DNS lookups for the packets it captures. When reverse DNS lookup occurs, a sniffer detection tool sniffs the lookup request to see if the target is the one requesting resolution of that nonexistent host. 2. The Ping Test This method relies on a problem in the target machine's kernel. we can construct an ICMP echo request with the IP address of the machine suspected of 6

4 hosting a sniffer but with a deliberately mismatched MAC address. We send an ICMP echo packet to the target with the correct destination IP address, but a bogus destination hardware address. Most systems will disregard this packet since its hardware address information is incorrect. But in some Linux, NetBSD and NT systems, since the NIC is in promiscuous mode, the sniffer will grab this packet off the network as a legitimate packet and respond accordingly. If the target in question replies to our request, we know it is in promiscuous mode. Clever attackers are of course aware of this and can update their sniffers to filter out such packets as the NIC itself would have had it not been in promiscuous mode. 3. The ICMP Ping Latency Test In this method, we ping the target and note the round trip time (RTT), from there. We create hundreds of fake TCP connections on our network segment at a lightning rate. We expect the sniffer to be processing those packets at a rate where the target machine's network latency will increase. We then ping the target once again, and compare the RTT this time to the first time. After a series of tests and averages, we can conclude whether or not a sniffer is indeed running on the target. 4. The ARP Test We send out an ARP request to our target with all valid information except a bogus destination hardware address. A machine that is not in promiscuous mode would never see the packet, since it wasn't destined to them, therefore it wouldn't reply. If a machine is in promiscuous mode, the ARP request would be seen and the kernel would process it and reply. By the machine replying, we know it is in promiscuous mode. Prevention of Sniffing Use switches instead of hubs. However, many commercial switches can be "overwhelmed" into behaving as though they are hubs. 7

5 Lab Experiment Requirements: Setup a network contains at least two machines (in the lab) or you can use software like VMware or Virtual PC to built you virtual lab (in the home). Procedures : 1. From PC1 setup wireshark (or other sniffing tool), from capture menu select interfaces then a list of network interfaces NIC will shown, select the interface that connected to the network you want to sniff. 2. Click start to start sniffing, in this case sniffing tool will capture any packet on the wire and analyze it ; as shown in figure 1 and If we want to sniff a specific machine then we can use options of the tool to determine specific ip to filter the captured packet to that ip. The analysis result of the sniffing tool depend on the packet that captured and the protocol that create the packet and will displayed according to OSI model, as an example if we deal with ARP protocol then the data will only in the lower layer (Physical, Data link, Network) and no other data because the ARP protocol work over Network layer as shown in figure1 ; another example is DNS packet the data that will displayed is in all layers (Physical,Data link, Network, Transport, and Application) as shown in figure 2. Let we discuss an example of analyzing a captured packet (DNS example) ; the result of the analyzing will displayed in the middle panel of the wireshark : 1. The first layer displays the Physical layer data. 2. The second layer shows the MAC address for the sender and receiver if available otherwise it give the MAC of the gateway for the sniffed machine, as shown in figure3. 3. Third layer shows the Network layer, the data in this layer is packet :it contains the source ip address and destination ip address, the internet protocol version ie, IPv4 or IPv6, checksum and other related information to this layer, as shown in figure Next layer displays the Transport layer (TCP or UDP), it displays source and destination ports and other related information, as shown in figure The last thing is the upper layer protocols, this data in this layers depends on the protocols that initialize the packet, as in our example the data here is related to DNS (Domain Name Service),as shown in figure We can use filter to display specific data such as UDP packets only, or ICMP echo request and echo reply as shown in figure 5. 8

6 Figure 1 ARP packet example Figure 2 DNS packet example 9

7 Figure 3 The figure illustrate data link layer frame with Src MAC address 00:19:d1:07:9b:18 and Dst MAC 00:11:f5:88:cd:24 and network layer packet with Src ip address and Dst ip and version 4 and the checksum is 0x6e0c. Figure 4 This figure illustrate the transport layer UDP protocol data with 4348 Src port, and 53 Dst port; and the application layer data of the DNS query about site: 10

8 Figure 5 Using specific filter Also we can use wireshark sniffer using Backtrack Linux, From StartBacktrackPrivilege Escalation SniffersWireshark Figure 6 running wireshark from backtrack Also we can use other available sniffers such dsniff. 11

9 Exercise : Install Wireshark on your PC and start sniffing for some seconds, then analyze four different packets, for example if you capture ARP request packet you must show that this packet work only in the lower three layers and show the source IP and MAC and destination IP and MAC, also anything important and can recognize the captured packet. 12

Packet Sniffer Detection with AntiSniff

Packet Sniffer Detection with AntiSniff Ryan Spangler University of Wisconsin - Whitewater Department of Computer and Network Administration May 2003 Abstract Packet sniffing is a technique of monitoring every packet that crosses the network.

More information

A Research Study on Packet Sniffing Tool TCPDUMP

A Research Study on Packet Sniffing Tool TCPDUMP A Research Study on Packet Sniffing Tool TCPDUMP ANSHUL GUPTA SURESH GYAN VIHAR UNIVERSITY, INDIA ABSTRACT Packet sniffer is a technique of monitoring every packet that crosses the network. By using this

More information

Packet Sniffers Submitted in partial fulfillment of the requirement for the award of degree Of MCA

Packet Sniffers Submitted in partial fulfillment of the requirement for the award of degree Of MCA A Seminar report On Packet Sniffers Submitted in partial fulfillment of the requirement for the award of degree Of MCA SUBMITTED TO: www.studymafia.org SUBMITTED BY: www.studymafia.org Preface I have made

More information

Lab - Using Wireshark to Observe the TCP 3-Way Handshake

Lab - Using Wireshark to Observe the TCP 3-Way Handshake Topology Objectives Part 1: Prepare Wireshark to Capture Packets Select an appropriate NIC interface to capture packets. Part 2: Capture, Locate, and Examine Packets Capture a web session to www.google.com.

More information

Lab VI Capturing and monitoring the network traffic

Lab VI Capturing and monitoring the network traffic Lab VI Capturing and monitoring the network traffic 1. Goals To gain general knowledge about the network analyzers and to understand their utility To learn how to use network traffic analyzer tools (Wireshark)

More information

BASIC ANALYSIS OF TCP/IP NETWORKS

BASIC ANALYSIS OF TCP/IP NETWORKS BASIC ANALYSIS OF TCP/IP NETWORKS INTRODUCTION Communication analysis provides powerful tool for maintenance, performance monitoring, attack detection, and problems fixing in computer networks. Today networks

More information

Linux Network Security

Linux Network Security Linux Network Security Course ID SEC220 Course Description This extremely popular class focuses on network security, and makes an excellent companion class to the GL550: Host Security course. Protocols

More information

Packet Sniffing: What it s Used for, its Vulnerabilities, and How to Uncover Sniffers

Packet Sniffing: What it s Used for, its Vulnerabilities, and How to Uncover Sniffers Packet Sniffing: What it s Used for, its Vulnerabilities, and How to Uncover Sniffers Mathurshan Vimalesvaran Tufts University Abstract Packets are the base of all data sent on the internet, yet they are

More information

Computer Networks/DV2 Lab

Computer Networks/DV2 Lab Computer Networks/DV2 Lab Room: BB 219 Additional Information: http://www.fb9dv.uni-duisburg.de/ti/en/education/teaching/ss08/netlab Equipment for each group: - 1 Server computer (OS: Windows 2000 Advanced

More information

LEARNING COMPUTER SYSTEMS VULNERABILITIES EXPLOITATION THROUGH PENETRATION TEST EXPERIMENTS

LEARNING COMPUTER SYSTEMS VULNERABILITIES EXPLOITATION THROUGH PENETRATION TEST EXPERIMENTS 1 LEARNING COMPUTER SYSTEMS VULNERABILITIES EXPLOITATION THROUGH PENETRATION TEST EXPERIMENTS Te-Shun Chou and Tijjani Mohammed Department of Technology Systems East Carolina University chout@ecu.edu Abstract

More information

Intrusion Detection, Packet Sniffing

Intrusion Detection, Packet Sniffing Intrusion Detection, Packet Sniffing By : Eng. Ayman Amaireh Supervisor :Dr.: Lo'ai Tawalbeh New York Institute of Technology (NYIT)- Jordan s s campus-2006 12/2/2006 eng Ayman 1 What is a "packet sniffer"?

More information

INTERNATIONAL JOURNAL OF PURE AND APPLIED RESEARCH IN ENGINEERING AND TECHNOLOGY

INTERNATIONAL JOURNAL OF PURE AND APPLIED RESEARCH IN ENGINEERING AND TECHNOLOGY INTERNATIONAL JOURNAL OF PURE AND APPLIED RESEARCH IN ENGINEERING AND TECHNOLOGY A PATH FOR HORIZING YOUR INNOVATIVE WORK PACKET SNIFFING MS. SONALI A. KARALE 1, MS. PUNAM P. HARKUT 2 HVPM COET Amravati.

More information

Attack Lab: Attacks on TCP/IP Protocols

Attack Lab: Attacks on TCP/IP Protocols Laboratory for Computer Security Education 1 Attack Lab: Attacks on TCP/IP Protocols Copyright c 2006-2010 Wenliang Du, Syracuse University. The development of this document is funded by the National Science

More information

Packet Sniffing with Wireshark and Tcpdump

Packet Sniffing with Wireshark and Tcpdump Packet Sniffing with Wireshark and Tcpdump Capturing, or sniffing, network traffic is invaluable for network administrators troubleshooting network problems, security engineers investigating network security

More information

Transport and Network Layer Protocols Lab TCP/IP

Transport and Network Layer Protocols Lab TCP/IP Transport and Network Layer Protocols Lab TCP/IP Name: Date Experiment Performed: Group Members: TCP/IP lab Version 1.3, February 2004-1 - PART I: Internet Protocol (IP) Objective Internet Protocols are

More information

Information Security Training. Assignment 1 Networking

Information Security Training. Assignment 1 Networking Information Security Training Assignment 1 Networking By Justin C. Klein Keane September 28, 2012 Assignment 1 For this assignment you will utilize several networking utilities

More information

Local DNS Attack Lab. 1 Lab Overview. 2 Lab Environment. SEED Labs Local DNS Attack Lab 1

Local DNS Attack Lab. 1 Lab Overview. 2 Lab Environment. SEED Labs Local DNS Attack Lab 1 SEED Labs Local DNS Attack Lab 1 Local DNS Attack Lab Copyright c 2006 Wenliang Du, Syracuse University. The development of this document was partially funded by the National Science Foundation s Course,

More information

Network Traffic Analysis

Network Traffic Analysis 2013 Network Traffic Analysis Gerben Kleijn and Terence Nicholls 6/21/2013 Contents Introduction... 3 Lab 1 - Installing the Operating System (OS)... 3 Lab 2 Working with TCPDump... 4 Lab 3 - Installing

More information

Introduction to Analyzer and the ARP protocol

Introduction to Analyzer and the ARP protocol Laboratory 6 Introduction to Analyzer and the ARP protocol Objetives Network monitoring tools are of interest when studying the behavior of network protocols, in particular TCP/IP, and for determining

More information

Procedure: You can find the problem sheet on Drive D: of the lab PCs. 1. IP address for this host computer 2. Subnet mask 3. Default gateway address

Procedure: You can find the problem sheet on Drive D: of the lab PCs. 1. IP address for this host computer 2. Subnet mask 3. Default gateway address Objectives University of Jordan Faculty of Engineering & Technology Computer Engineering Department Computer Networks Laboratory 907528 Lab.4 Basic Network Operation and Troubleshooting 1. To become familiar

More information

Introduction to Network Security Lab 1 - Wireshark

Introduction to Network Security Lab 1 - Wireshark Introduction to Network Security Lab 1 - Wireshark Bridges To Computing 1 Introduction: In our last lecture we discussed the Internet the World Wide Web and the Protocols that are used to facilitate communication

More information

Detection of Promiscuous Nodes Using ARP Packets

Detection of Promiscuous Nodes Using ARP Packets Detection of Promiscuous Nodes Using ARP Packets Version 1.0 Written by: 31Aug01 Daiji Sanai Translated by: Kelvin KingPang Tsang http://www.securityfriday.com 1 Contents Abstract...3

More information

Introduction on Low level Network tools

Introduction on Low level Network tools Georges Da Costa dacosta@irit.fr http: //www.irit.fr/~georges.da-costa/cours/addis/ 1 Introduction 2 Aircrack-ng 3 Wireshark Low level tools Hacking tools Aircrack-ng (ex Aircrack, ex Airsnort) WEP/WPA

More information

Computer Networks/DV2 Lab

Computer Networks/DV2 Lab Computer Networks/DV2 Lab Room: BB 219 Additional Information: http://www.fb9dv.uni-duisburg.de/ti/en/education/teaching/ss13/netlab Equipment for each group: - 1 Server computer (OS: Windows Server 2008

More information

CCNA Discovery 4.0.3.0 Networking for Homes and Small Businesses Student Packet Tracer Lab Manual

CCNA Discovery 4.0.3.0 Networking for Homes and Small Businesses Student Packet Tracer Lab Manual 4.0.3.0 Networking for Homes and Small Businesses Student Packet Tracer Lab Manual This document is exclusive property of Cisco Systems, Inc. Permission is granted to print and copy this document for non-commercial

More information

TCP/IP Security Problems. History that still teaches

TCP/IP Security Problems. History that still teaches TCP/IP Security Problems History that still teaches 1 remote login without a password rsh and rcp were programs that allowed you to login from a remote site without a password The.rhosts file in your home

More information

Own your LAN with Arp Poison Routing

Own your LAN with Arp Poison Routing Own your LAN with Arp Poison Routing By: Rorik Koster April 17, 2006 Security is a popular buzzword heard every day throughout our American culture and possibly even more so in our global economy. From

More information

Lab 1: Network Devices and Technologies - Capturing Network Traffic

Lab 1: Network Devices and Technologies - Capturing Network Traffic CompTIA Security+ Lab Series Lab 1: Network Devices and Technologies - Capturing Network Traffic CompTIA Security+ Domain 1 - Network Security Objective 1.1: Explain the security function and purpose of

More information

Lab Exercise Ethernet

Lab Exercise Ethernet Lab Exercise Ethernet Objective To explore the details of Ethernet frames. Ethernet is a popular link layer protocol. Modern computers connect to Ethernet switches rather than use classic Ethernet. The

More information

DNS Pharming Attack Lab

DNS Pharming Attack Lab CNT 5410 - Fall 2014 1 DNS Pharming Attack Lab (This is a modified version of the exercise listed below. Modifications are to provide tighter configuration so as to minimize the risk of traffic leaving

More information

Packet Sniffing on Layer 2 Switched Local Area Networks

Packet Sniffing on Layer 2 Switched Local Area Networks Packet Sniffing on Layer 2 Switched Local Area Networks Ryan Spangler ryan@packetwatch.net Packetwatch Research http://www.packetwatch.net December 2003 Abstract Packet sniffing is a technique of monitoring

More information

Attack Lab: Attacks on TCP/IP Protocols

Attack Lab: Attacks on TCP/IP Protocols Laboratory for Computer Security Education 1 Attack Lab: Attacks on TCP/IP Protocols Copyright c 2006-2009 Wenliang Du, Syracuse University. The development of this document is funded by the National Science

More information

Chapter 8 Security Pt 2

Chapter 8 Security Pt 2 Chapter 8 Security Pt 2 IC322 Fall 2014 Computer Networking: A Top Down Approach 6 th edition Jim Kurose, Keith Ross Addison-Wesley March 2012 All material copyright 1996-2012 J.F Kurose and K.W. Ross,

More information

Figure 1. Wireshark Menu Bar

Figure 1. Wireshark Menu Bar Packet Capture In this article, we shall cover the basic working of a sniffer, to capture packets for analyzing the traffic. If an analyst does not have working skills of a packet sniffer to a certain

More information

Session Hijacking Exploiting TCP, UDP and HTTP Sessions

Session Hijacking Exploiting TCP, UDP and HTTP Sessions Session Hijacking Exploiting TCP, UDP and HTTP Sessions Shray Kapoor shray.kapoor@gmail.com Preface With the emerging fields in e-commerce, financial and identity information are at a higher risk of being

More information

Modern snoop lab lite version

Modern snoop lab lite version Modern snoop lab lite version Lab assignment in Computer Networking OpenIPLab Department of Information Technology, Uppsala University Overview This is a lab constructed as part of the OpenIPLab project.

More information

1. LAB SNIFFING LAB ID: 10

1. LAB SNIFFING LAB ID: 10 H E R A LAB ID: 10 SNIFFING Sniffing in a switched network ARP Poisoning Analyzing a network traffic Extracting files from a network trace Stealing credentials Mapping/exploring network resources 1. LAB

More information

Lab 8.3.2 Conducting a Network Capture with Wireshark

Lab 8.3.2 Conducting a Network Capture with Wireshark Lab 8.3.2 Conducting a Network Capture with Wireshark Objectives Perform a network traffic capture with Wireshark to become familiar with the Wireshark interface and environment. Analyze traffic to a web

More information

Firewall Firewall August, 2003

Firewall Firewall August, 2003 Firewall August, 2003 1 Firewall and Access Control This product also serves as an Internet firewall, not only does it provide a natural firewall function (Network Address Translation, NAT), but it also

More information

SY0-201. system so that an unauthorized individual can take over an authorized session, or to disrupt service to authorized users.

SY0-201. system so that an unauthorized individual can take over an authorized session, or to disrupt service to authorized users. system so that an unauthorized individual can take over an authorized session, or to disrupt service to authorized users. From a high-level standpoint, attacks on computer systems and networks can be grouped

More information

During your session you will have access to the following lab configuration. CLIENT1 (Windows XP Workstation) 192.168.0.2 /24

During your session you will have access to the following lab configuration. CLIENT1 (Windows XP Workstation) 192.168.0.2 /24 Introduction The Network Vulnerabilities module provides you with the instruction and Server hardware to develop your hands on skills in the defined topics. This module includes the following exercises:

More information

EKT 332/4 COMPUTER NETWORK

EKT 332/4 COMPUTER NETWORK UNIVERSITI MALAYSIA PERLIS SCHOOL OF COMPUTER & COMMUNICATIONS ENGINEERING EKT 332/4 COMPUTER NETWORK LABORATORY MODULE LAB 2 NETWORK PROTOCOL ANALYZER (SNIFFING AND IDENTIFY PROTOCOL USED IN LIVE NETWORK)

More information

1 Data information is sent onto the network cable using which of the following? A Communication protocol B Data packet

1 Data information is sent onto the network cable using which of the following? A Communication protocol B Data packet Review questions 1 Data information is sent onto the network cable using which of the following? A Communication protocol B Data packet C Media access method D Packages 2 To which TCP/IP architecture layer

More information

Module 1: Reviewing the Suite of TCP/IP Protocols

Module 1: Reviewing the Suite of TCP/IP Protocols Module 1: Reviewing the Suite of TCP/IP Protocols Contents Overview 1 Lesson: Overview of the OSI Model 2 Lesson: Overview of the TCP/IP Protocol Suite 7 Lesson: Viewing Frames Using Network Monitor 14

More information

WIRELESS SECURITY. Information Security in Systems & Networks Public Development Program. Sanjay Goel University at Albany, SUNY Fall 2006

WIRELESS SECURITY. Information Security in Systems & Networks Public Development Program. Sanjay Goel University at Albany, SUNY Fall 2006 WIRELESS SECURITY Information Security in Systems & Networks Public Development Program Sanjay Goel University at Albany, SUNY Fall 2006 1 Wireless LAN Security Learning Objectives Students should be able

More information

Practical Network Forensics

Practical Network Forensics BCS-ISSG Practical Network Forensics Day BCS, London Practical Network Forensics Alan Woodroffe issg@securesystemssupport.co.uk www.securesystemssupport.co.uk Copyright Secure Systems Support Limited.

More information

Wireshark Tutorial INTRODUCTION

Wireshark Tutorial INTRODUCTION Wireshark Tutorial INTRODUCTION The purpose of this document is to introduce the packet sniffer WIRESHARK. WIRESHARK would be used for the lab experiments. This document introduces the basic operation

More information

Overview. Securing TCP/IP. Introduction to TCP/IP (cont d) Introduction to TCP/IP

Overview. Securing TCP/IP. Introduction to TCP/IP (cont d) Introduction to TCP/IP Overview Securing TCP/IP Chapter 6 TCP/IP Open Systems Interconnection Model Anatomy of a Packet Internet Protocol Security (IPSec) Web Security (HTTP over TLS, Secure-HTTP) Lecturer: Pei-yih Ting 1 2

More information

VisuSniff: A Tool For The Visualization Of Network Traffic

VisuSniff: A Tool For The Visualization Of Network Traffic VisuSniff: A Tool For The Visualization Of Network Traffic Rainer Oechsle University of Applied Sciences, Trier Postbox 1826 D-54208 Trier +49/651/8103-508 oechsle@informatik.fh-trier.de Oliver Gronz University

More information

Network Monitoring. By: Delbert Thompson Network & Network Security Supervisor Basin Electric Power Cooperative

Network Monitoring. By: Delbert Thompson Network & Network Security Supervisor Basin Electric Power Cooperative Network Monitoring By: Delbert Thompson Network & Network Security Supervisor Basin Electric Power Cooperative Overview of network Logical network view Goals of Network Monitoring Determine overall health

More information

CS5008: Internet Computing

CS5008: Internet Computing CS5008: Internet Computing Lecture 22: Internet Security A. O Riordan, 2009, latest revision 2015 Internet Security When a computer connects to the Internet and begins communicating with others, it is

More information

ΕΠΛ 674: Εργαστήριο 5 Firewalls

ΕΠΛ 674: Εργαστήριο 5 Firewalls ΕΠΛ 674: Εργαστήριο 5 Firewalls Παύλος Αντωνίου Εαρινό Εξάμηνο 2011 Department of Computer Science Firewalls A firewall is hardware, software, or a combination of both that is used to prevent unauthorized

More information

Lab 1: Packet Sniffing and Wireshark

Lab 1: Packet Sniffing and Wireshark Introduction CSC 5991 Cyber Security Practice Lab 1: Packet Sniffing and Wireshark The first part of the lab introduces packet sniffer, Wireshark. Wireshark is a free opensource network protocol analyzer.

More information

Course Overview: Learn the essential skills needed to set up, configure, support, and troubleshoot your TCP/IP-based network.

Course Overview: Learn the essential skills needed to set up, configure, support, and troubleshoot your TCP/IP-based network. Course Name: TCP/IP Networking Course Overview: Learn the essential skills needed to set up, configure, support, and troubleshoot your TCP/IP-based network. TCP/IP is the globally accepted group of protocols

More information

How to monitor network traffic inside an ESXi host

How to monitor network traffic inside an ESXi host created by: Rainer Bemsel Version 1.0 Dated: Dec/30/2012 I ve done several packet analyses on physical wired environment which was easy and pretty straight forward to set up. But with all virtualization

More information

Lab - Using Wireshark to View Network Traffic

Lab - Using Wireshark to View Network Traffic Topology Objectives Part 1: (Optional) Download and Install Wireshark Part 2: Capture and Analyze Local ICMP Data in Wireshark Start and stop data capture of ping traffic to local hosts. Locate the IP

More information

Packet Tracer Simulation - TCP and UDP Communications (Instructor Version Optional Packet Tracer)

Packet Tracer Simulation - TCP and UDP Communications (Instructor Version Optional Packet Tracer) (Instructor Version Optional Packet Tracer) Instructor Note: Red font color or gray highlights indicate text that appears in the instructor copy only. Optional activities are designed to enhance understanding

More information

Introduction to Passive Network Traffic Monitoring

Introduction to Passive Network Traffic Monitoring Introduction to Passive Network Traffic Monitoring CS459 ~ Internet Measurements Spring 2015 Despoina Antonakaki antonakd@csd.uoc.gr Active Monitoring Inject test packets into the network or send packets

More information

Stateful Firewalls. Hank and Foo

Stateful Firewalls. Hank and Foo Stateful Firewalls Hank and Foo 1 Types of firewalls Packet filter (stateless) Proxy firewalls Stateful inspection Deep packet inspection 2 Packet filter (Access Control Lists) Treats each packet in isolation

More information

Lab Exercise DNS. Objective. Requirements. Network Setup

Lab Exercise DNS. Objective. Requirements. Network Setup Lab Exercise DNS Objective DNS (Domain Name System) is the system and protocol that translates domain names to IP addresses and more. DNS is covered in 7.1 of your text. Review that section before doing

More information

Lab 2. CS-335a. Fall 2012 Computer Science Department. Manolis Surligas surligas@csd.uoc.gr

Lab 2. CS-335a. Fall 2012 Computer Science Department. Manolis Surligas surligas@csd.uoc.gr Lab 2 CS-335a Fall 2012 Computer Science Department Manolis Surligas surligas@csd.uoc.gr 1 Summary At this lab we will cover: Basics of Transport Layer (TCP, UDP) Broadcast ARP DNS More Wireshark filters

More information

Virtual private network. Network security protocols VPN VPN. Instead of a dedicated data link Packets securely sent over a shared network Internet VPN

Virtual private network. Network security protocols VPN VPN. Instead of a dedicated data link Packets securely sent over a shared network Internet VPN Virtual private network Network security protocols COMP347 2006 Len Hamey Instead of a dedicated data link Packets securely sent over a shared network Internet VPN Public internet Security protocol encrypts

More information

2. HOW PACKET SNIFFER WORKS

2. HOW PACKET SNIFFER WORKS An Approach to Detect Packets Using Packet Sniffing Rupam 1, Atul Verma 2, Ankita Singh 3 Department of Computer Science, Sri Ram Swroop Memorial Group of Professional Colleges Tiwari Gang Faizabad Road,

More information

Unix System Administration

Unix System Administration Unix System Administration Chris Schenk Lecture 08 Tuesday Feb 13 CSCI 4113, Spring 2007 ARP Review Host A 128.138.202.50 00:0B:DB:A6:76:18 Host B 128.138.202.53 00:11:43:70:45:81 Switch Host C 128.138.202.71

More information

A Protocol Based Packet Sniffer

A Protocol Based Packet Sniffer Available Online at www.ijcsmc.com International Journal of Computer Science and Mobile Computing A Monthly Journal of Computer Science and Information Technology IJCSMC, Vol. 4, Issue. 3, March 2015,

More information

Computer Networks I Laboratory Exercise 1

Computer Networks I Laboratory Exercise 1 Computer Networks I Laboratory Exercise 1 The lab is divided into two parts where the first part is a basic PC network TCP/IP configuration and connection to the Internet. The second part is building a

More information

ARP Poisoning (Man-in-the-Middle) Attack and Mitigation Techniques

ARP Poisoning (Man-in-the-Middle) Attack and Mitigation Techniques Layer 2 Attacks and Mitigation Techniques for the Cisco Catalyst 6500 Series Switches Running Cisco IOS Software ARP Poisoning (Man-in-the-Middle) Attack and Mitigation Techniques A CSSTG SE Residency

More information

Security+ Guide to Network Security Fundamentals, Fourth Edition. Chapter 6 Network Security

Security+ Guide to Network Security Fundamentals, Fourth Edition. Chapter 6 Network Security Security+ Guide to Network Security Fundamentals, Fourth Edition Chapter 6 Network Security Objectives List the different types of network security devices and explain how they can be used Define network

More information

Chapter 8 Phase3: Gaining Access Using Network Attacks

Chapter 8 Phase3: Gaining Access Using Network Attacks Chapter 8 Phase3: Gaining Access Using Network Attacks Tools used in Network Attacks Sniffing Spoofing Session hijacking Netcat Sniffer Allows attacker to see everything sent across the network, including

More information

Intrusion Detection and Prevention: Network and IDS Configuration and Monitoring using Snort

Intrusion Detection and Prevention: Network and IDS Configuration and Monitoring using Snort License Intrusion Detection and Prevention: Network and IDS Configuration and Monitoring using Snort This work by Z. Cliffe Schreuders at Leeds Metropolitan University is licensed under a Creative Commons

More information

JK0-022 CompTIA Academic/E2C Security+ Certification Exam CompTIA

JK0-022 CompTIA Academic/E2C Security+ Certification Exam CompTIA JK0-022 CompTIA Academic/E2C Security+ Certification Exam CompTIA To purchase Full version of Practice exam click below; http://www.certshome.com/jk0-022-practice-test.html FOR CompTIA JK0-022 Exam Candidates

More information

ΕΠΛ 475: Εργαστήριο 9 Firewalls Τοίχοι πυρασφάλειας. University of Cyprus Department of Computer Science

ΕΠΛ 475: Εργαστήριο 9 Firewalls Τοίχοι πυρασφάλειας. University of Cyprus Department of Computer Science ΕΠΛ 475: Εργαστήριο 9 Firewalls Τοίχοι πυρασφάλειας Department of Computer Science Firewalls A firewall is hardware, software, or a combination of both that is used to prevent unauthorized Internet users

More information

CCNA R&S: Introduction to Networks. Chapter 5: Ethernet

CCNA R&S: Introduction to Networks. Chapter 5: Ethernet CCNA R&S: Introduction to Networks Chapter 5: Ethernet 5.0.1.1 Introduction The OSI physical layer provides the means to transport the bits that make up a data link layer frame across the network media.

More information

Wireless Security: Secure and Public Networks Kory Kirk

Wireless Security: Secure and Public Networks Kory Kirk Wireless Security: Secure and Public Networks Kory Kirk Villanova University Computer Science kory.kirk@villanova.edu www.korykirk.com/ Abstract Due to the increasing amount of wireless access points that

More information

Introduction To Computer Networking

Introduction To Computer Networking Introduction To Computer Networking Alex S. 1 Introduction 1.1 Serial Lines Serial lines are generally the most basic and most common communication medium you can have between computers and/or equipment.

More information

Lab exercise: Working with Wireshark and Snort for Intrusion Detection

Lab exercise: Working with Wireshark and Snort for Intrusion Detection CS 491S: Computer and Network Security Fall 2008 Lab exercise: Working with Wireshark and Snort for Intrusion Detection Abstract: This lab is intended to give you experience with two key tools used by

More information

Network Security: Workshop

Network Security: Workshop Network Security: Workshop Protocol Analyzer Network analysis is the process of capturing network traffic and inspecting it closely to determine what is happening on the network decodes,, or dissects,,

More information

Lab - Observing DNS Resolution

Lab - Observing DNS Resolution Objectives Part 1: Observe the DNS Conversion of a URL to an IP Address Part 2: Observe DNS Lookup Using the nslookup Command on a Web Site Part 3: Observe DNS Lookup Using the nslookup Command on Mail

More information

Technical Support Information Belkin internal use only

Technical Support Information Belkin internal use only The fundamentals of TCP/IP networking TCP/IP (Transmission Control Protocol / Internet Protocols) is a set of networking protocols that is used for communication on the Internet and on many other networks.

More information

Firewalls P+S Linux Router & Firewall 2013

Firewalls P+S Linux Router & Firewall 2013 Firewalls P+S Linux Router & Firewall 2013 Firewall Techniques What is a firewall? A firewall is a hardware or software device which is configured to permit, deny, or proxy data through a computer network

More information

CET442L Lab #2. IP Configuration and Network Traffic Analysis Lab

CET442L Lab #2. IP Configuration and Network Traffic Analysis Lab CET442L Lab #2 IP Configuration and Network Traffic Analysis Lab Goals: In this lab you will plan and implement the IP configuration for the Windows server computers on your group s network. You will use

More information

Snoopy. Objective: Equipment Needed. Background. Procedure. Due Date: Nov 1 Points: 25 Points

Snoopy. Objective: Equipment Needed. Background. Procedure. Due Date: Nov 1 Points: 25 Points Snoopy Due Date: Nov 1 Points: 25 Points Objective: To gain experience intercepting/capturing HTTP/TCP traffic on a network. Equipment Needed Use the Ubuntu OS that you originally downloaded from the course

More information

CS 326e F2002 Lab 1. Basic Network Setup & Ethereal Time: 2 hrs

CS 326e F2002 Lab 1. Basic Network Setup & Ethereal Time: 2 hrs CS 326e F2002 Lab 1. Basic Network Setup & Ethereal Time: 2 hrs Tasks: 1 (10 min) Verify that TCP/IP is installed on each of the computers 2 (10 min) Connect the computers together via a switch 3 (10 min)

More information

Lab - Using IOS CLI with Switch MAC Address Tables

Lab - Using IOS CLI with Switch MAC Address Tables Topology Addressing Table Objectives Device Interface IP Address Subnet Mask Default Gateway R1 G0/1 192.168.1.1 255.255.255.0 N/A S1 VLAN 1 192.168.1.11 255.255.255.0 192.168.1.1 S2 VLAN 1 192.168.1.12

More information

INTERNET SECURITY: THE ROLE OF FIREWALL SYSTEM

INTERNET SECURITY: THE ROLE OF FIREWALL SYSTEM INTERNET SECURITY: THE ROLE OF FIREWALL SYSTEM Okumoku-Evroro Oniovosa Lecturer, Department of Computer Science Delta State University, Abraka, Nigeria Email: victorkleo@live.com ABSTRACT Internet security

More information

3. MONITORING AND TESTING THE ETHERNET NETWORK

3. MONITORING AND TESTING THE ETHERNET NETWORK 3. MONITORING AND TESTING THE ETHERNET NETWORK 3.1 Introduction The following parameters are covered by the Ethernet performance metrics: Latency (delay) the amount of time required for a frame to travel

More information

Detecting Threats in Network Security by Analyzing Network Packets using Wireshark

Detecting Threats in Network Security by Analyzing Network Packets using Wireshark 1 st International Conference of Recent Trends in Information and Communication Technologies Detecting Threats in Network Security by Analyzing Network Packets using Wireshark Abdulalem Ali *, Arafat Al-Dhaqm,

More information

Firewall VPN Router. Quick Installation Guide M73-APO09-380

Firewall VPN Router. Quick Installation Guide M73-APO09-380 Firewall VPN Router Quick Installation Guide M73-APO09-380 Firewall VPN Router Overview The Firewall VPN Router provides three 10/100Mbit Ethernet network interface ports which are the Internal/LAN, External/WAN,

More information

CS197U: A Hands on Introduction to Unix

CS197U: A Hands on Introduction to Unix CS197U: A Hands on Introduction to Unix Lecture 10: Security Issues and Traffic Monitoring Tian Guo University of Massachusetts Amherst CICS 1 Reminders Assignment 5 is due Thursday (Oct. 22) Part 1 (tracking

More information

Proxies. Chapter 4. Network & Security Gildas Avoine

Proxies. Chapter 4. Network & Security Gildas Avoine Proxies Chapter 4 Network & Security Gildas Avoine SUMMARY OF CHAPTER 4 Generalities Forward Proxies Reverse Proxies Open Proxies Conclusion GENERALITIES Generalities Forward Proxies Reverse Proxies Open

More information

Multi-Homing Dual WAN Firewall Router

Multi-Homing Dual WAN Firewall Router Multi-Homing Dual WAN Firewall Router Quick Installation Guide M73-APO09-400 Multi-Homing Dual WAN Firewall Router Overview The Multi-Homing Dual WAN Firewall Router provides three 10/100Mbit Ethernet

More information

Packet Sniffing and Spoofing Lab

Packet Sniffing and Spoofing Lab SEED Labs Packet Sniffing and Spoofing Lab 1 Packet Sniffing and Spoofing Lab Copyright c 2014 Wenliang Du, Syracuse University. The development of this document is/was funded by the following grants from

More information

Network Security: Workshop. Dr. Anat Bremler-Barr. Assignment #2 Analyze dump files Solution Taken from www.chrissanders.org

Network Security: Workshop. Dr. Anat Bremler-Barr. Assignment #2 Analyze dump files Solution Taken from www.chrissanders.org 1.pcap - File download Network Security: Workshop Dr. Anat Bremler-Barr Assignment #2 Analyze dump files Solution Taken from www.chrissanders.org Downloading a file is a pretty basic function when described

More information

LAB THREE STATIC ROUTING

LAB THREE STATIC ROUTING LAB THREE STATIC ROUTING In this lab you will work with four different network topologies. The topology for Parts 1-4 is shown in Figure 3.1. These parts address router configuration on Linux PCs and a

More information

Cisco Configuring Commonly Used IP ACLs

Cisco Configuring Commonly Used IP ACLs Table of Contents Configuring Commonly Used IP ACLs...1 Introduction...1 Prerequisites...2 Hardware and Software Versions...3 Configuration Examples...3 Allow a Select Host to Access the Network...3 Allow

More information

Hands-on Network Traffic Analysis. 2015 Cyber Defense Boot Camp

Hands-on Network Traffic Analysis. 2015 Cyber Defense Boot Camp Hands-on Network Traffic Analysis 2015 Cyber Defense Boot Camp What is this about? Prerequisite: network packet & packet analyzer: (header, data) Enveloped letters inside another envelope Exercises Basic

More information

CYBER ATTACKS EXPLAINED: THE MAN IN THE MIDDLE

CYBER ATTACKS EXPLAINED: THE MAN IN THE MIDDLE CYBER ATTACKS EXPLAINED: THE MAN IN THE MIDDLE Due to the encouraging feedback this series of articles has received, we decided to explore yet another type of cyber intrusionthe Man In The Middle (MITM)

More information

This Lecture. The Internet and Sockets. The Start 1969. If everyone just sends a small packet of data, they can all use the line at the same.

This Lecture. The Internet and Sockets. The Start 1969. If everyone just sends a small packet of data, they can all use the line at the same. This Lecture The Internet and Sockets Computer Security Tom Chothia How the Internet works. Some History TCP/IP Some useful network tools: Nmap, WireShark Some common attacks: The attacker controls the

More information

Transformation of honeypot raw data into structured data

Transformation of honeypot raw data into structured data Transformation of honeypot raw data into structured data 1 Majed SANAN, Mahmoud RAMMAL 2,Wassim RAMMAL 3 1 Lebanese University, Faculty of Sciences. 2 Lebanese University, Director of center of Research

More information

A1.1.1.11.1.1.2 1.1.1.3S B

A1.1.1.11.1.1.2 1.1.1.3S B CS Computer 640: Network AdityaAkella Lecture Introduction Networks Security 25 to Security DoS Firewalls and The D-DoS Vulnerabilities Road Ahead Security Attacks Protocol IP ICMP Routing TCP Security

More information