Netdefender
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The document describes a firewall called Net Defender that was developed by students to secure personal computers from unauthorized internet access. It discusses security issues on the internet, common attacks like DDoS and port scanning, and how firewalls work using techniques like packet filtering, address filtering and port blocking. It provides details of Net Defender's interface, features like adding rules and a port scanner, and how it prevents attacks and vulnerabilities using these techniques. Future work mentioned includes improving the analysis and extending it to model more complex firewalls.
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Knowledge and skills required for Network Administrators and Information Technology professionals to be aware of security vulnerabilities, to implement security measures, to analyze an existing network environment in consideration of known security threats or risks, to defend against attacks or viruses, and to ensure data privacy and integrity. Terminology and procedures for implementation and configuration of security, including access control, authorization, encryption, packet filters, firewalls, and Virtual Private Networks (VPNs).
CNIT 120: Network Security
http://samsclass.info/120/120_S09.shtml#lecture
Policy: http://samsclass.info/policy_use.htm
Many thanks to Sam Bowne for allowing to publish these presentations.
Firewall and It's Types
Firewalls are used to establish a controlled link between an internal network and the internet while protecting the internal network from external attacks. There are three main types of firewalls: packet-filtering routers which filter packets based on header information; application-level gateways which use proxy servers to establish connections and filter at the application layer; and circuit-level gateways which monitor TCP handshaking and filter at the session layer. The document then provides details on the design, characteristics, advantages, and disadvantages of each type of firewall.
Firewall & packet filter new
This document discusses firewalls and packet filters. It defines a firewall as a device that provides secure connectivity between networks and can be hardware, software, or a combination. There are two main types of firewalls - hardware and software. It also describes how firewalls and packet filters work, including inspecting packets and applying rules to determine if packets should be allowed through or blocked. The functions of packet filters are to control traffic and provide security. Manufacturing companies that provide firewall and packet filtering solutions are also listed.
Presentation, Firewalls
The document discusses firewall implementation for a company called Acme. It describes how Acme can set up firewalls to restrict access between internal and external networks and between different internal departments. Packet filtering, proxy servers, and demilitarized zones are implemented to enforce access controls and monitor network traffic flow while protecting sensitive data. The completed Acme intranet design includes multiple firewalls configured in screened subnets and dual-homed gateways to secure remote access and internal information flows.
The Security Of Information Security
This document discusses vulnerability assessment tools and their use in evaluating systems for security weaknesses. It outlines setting up a virtual machine environment with Windows, Metasploitable, and Kali Linux virtual machines. The OpenVAS vulnerability scanner is used to scan the Windows and Metasploitable VMs to identify vulnerabilities. The scans find open ports and suggest ways to remedy weaknesses found.
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Netdefender
- 1. Net Defender By: Y.Hemanth Kumar M.Krishna Reddy CH.Mahesh Tuesday, May 2, 2001 SC 546
- 8. Example of DoS attack: Intruder Target ICMP request with spoofed IP of target
- 9. Example of DoS attack: Intruder Target Flood Target with replies
- 11. Net Defenders
- 13. Net defender Problem Statement Developing a simple Firewall for securing Personal Computer from unauthorized access through Internet or network by novice and advanced users.
- 14. Objective of Net defender Net Defender software is being designed keeping in mind a novice user (those who knows very less about networking or computers). We had laid a great deal of stress in providing a sound user interface so that a general user should learn how to use and control this firewall in simple and easy steps.
- 17. Main Screen Firewall has a simple user interface that gives you instant access to all your security features
- 18. Add Rule : This dialog box will help in adding new rules to Firewall. To create a rule, you must first specify the kind of traffic that should be affected by the rule. There are several different characteristics of traffic, each of which you can use to specifythe kind of traffic that you want to control .
- 20. Well-known ports used by TCP Port Protocol Description 7 Echo Echoes a received datagram back to the sender 9 Discard Discards any datagram that is received 11 Users Active users 13 Daytime Returns the date and the time 17 Quote Returns a quote of the day 19 Chargen Returns a string of characters 20 FTP, Data File Transfer Protocol (data connection) 21 FTP, Control File Transfer Protocol (control connection) 23 TELNET Terminal Network 25 SMTP Simple Mail Transfer Protocol 53 DNS Domain Name Server 67 BOOTP Bootstrap Protocol 79 Finger Finger 80 HTTP Hypertext Transfer Protocol 111 RPC Remote Procedure Call
Editor's Notes
- Frequently, presenters must deliver material of a technical nature to an audience unfamiliar with the topic or vocabulary. The material may be complex or heavy with detail. To present technical material effectively, use the following guidelines from Dale Carnegie Training®. Consider the amount of time available and prepare to organize your material. Narrow your topic. Divide your presentation into clear segments. Follow a logical progression. Maintain your focus throughout. Close the presentation with a summary, repetition of the key steps, or a logical conclusion. Keep your audience in mind at all times. For example, be sure data is clear and information is relevant. Keep the level of detail and vocabulary appropriate for the audience. Use visuals to support key points or steps. Keep alert to the needs of your listeners, and you will have a more receptive audience.