TCP/IP Network Configuration Files: Domain Resolution Configuration
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Master Thesis
Master's Programme in Computer Network Engineering, 60 credits MASTER Connect street light control devices in a secure network THESIS Andreas Kostoulas, Efstathios Lykouropoulos, Zainab Jumaa Network security, 15 credits Halmstad 2015-02-16 “Connect street light control devices in a secure network” Master’s Thesis in Computer Network engineering 2014 Authors: Andreas Kostoulas, Efstathios Lykouropoulos, Zainab Jumaa Supervisor: Alexey Vinel Examiner: Tony Larsson Preface This thesis is submitted in partial fulfilment of the requirements for a Master’s Degree in Computer Network Engineering at the Department of Information Science - Computer and Electrical Engineering, at University of Halmstad, Sweden. The research - implementation described herein was conducted under the supervision of Professor Alexey Vinel and in cooperation with Greinon engineering. This was a challenging trip with both ups and downs but accompanied by an extend team of experts, always willing to coach, sponsor, help and motivate us. For this we would like to thank them. We would like to thank our parents and family for their financial and motivational support, although distance between us was more than 1500 kilometres. Last but not least we would like to thank our fellow researchers and friends on our department for useful discussions, comments, suggestions, thoughts and also creative and fun moments we spend together. i Abstract Wireless communications is a constantly progressing technology in network engineering society, creating an environment full of opportunities that are targeting in financial growth, quality of life and humans prosperity. Wireless security is the science that has as a goal to provide safe data communication between authorized users and prevent unauthorized users from gaining access, deny access, damage or counterfeit data in a wireless environment. -
N2N: a Layer Two Peer-To-Peer VPN
N2N: A Layer Two Peer-to-Peer VPN Luca Deri1, Richard Andrews2 ntop.org, Pisa, Italy1 Symstream Technologies, Melbourne, Australia2 {deri, andrews}@ntop.org Abstract. The Internet was originally designed as a flat data network delivering a multitude of protocols and services between equal peers. Currently, after an explosive growth fostered by enormous and heterogeneous economic interests, it has become a constrained network severely enforcing client-server communication where addressing plans, packet routing, security policies and users’ reachability are almost entirely managed and limited by access providers. From the user’s perspective, the Internet is not an open transport system, but rather a telephony-like communication medium for content consumption. This paper describes the design and implementation of a new type of peer-to- peer virtual private network that can allow users to overcome some of these limitations. N2N users can create and manage their own secure and geographically distributed overlay network without the need for central administration, typical of most virtual private network systems. Keywords: Virtual private network, peer-to-peer, network overlay. 1. Motivation and Scope of Work Irony pervades many pages of history, and computing history is no exception. Once personal computing had won the market battle against mainframe-based computing, the commercial evolution of the Internet in the nineties stepped the computing world back to a substantially rigid client-server scheme. While it is true that the today’s Internet serves as a good transport system for supplying a plethora of data interchange services, virtually all of them are delivered by a client-server model, whether they are centralised or distributed, pay-per-use or virtually free [1]. -
1 Introduction
Technical report, IDE1202, February 2012 Enhancing Network Security in Linux Environment Master Thesis in Computer Network Engineering By Ali Mohammed, Sachin Sama and Majeed Mohammed School of Information Science, Computer and Electrical Engineering Halmstad University i Enhancing Network Security in Linux Environment Master Thesis in Computer Network Engineering School of Information Science, Computer and Electrical Engineering Halmstad University Box 823, S-301 18 Halmstad, Sweden February 2012 ii Preface First of all, we would like to express our sincere gratitude to our Supervisor Philip Heimer and Professor Tony Larsson for their supervision and assistance in the entire thesis work. We are also thankful to IDE department, Halmstad University for providing this opportunity to complete this thesis. Ali Mohammed Sachin Sama Majeed Mohammed iii iv Abstract Designing a secured network is the most important task in any enterprise or organization development. Securing a network mainly involves applying policies and procedures to protect different network devices from unauthorized access. Servers such as web servers, file servers, mail servers, etc., are the important devices in a network. Therefore, securing these servers is the first and foremost step followed in every security implementation mechanism. To implement this, it is very important to analyse and study the security mechanisms provided by the operating system. This makes it easier for security implementation in a network. This thesis work demonstrates the tasks needed to enhance the network security in Linux environment. The various security modules existing in Linux makes it different from other operating systems. The security measures which are mainly needed to enhance the system security are documented as a baseline for practical implementation. -
AWS Site-To-Site VPN User Guide AWS Site-To-Site VPN User Guide
AWS Site-to-Site VPN User Guide AWS Site-to-Site VPN User Guide AWS Site-to-Site VPN: User Guide Copyright © Amazon Web Services, Inc. and/or its affiliates. All rights reserved. Amazon's trademarks and trade dress may not be used in connection with any product or service that is not Amazon's, in any manner that is likely to cause confusion among customers, or in any manner that disparages or discredits Amazon. All other trademarks not owned by Amazon are the property of their respective owners, who may or may not be affiliated with, connected to, or sponsored by Amazon. AWS Site-to-Site VPN User Guide Table of Contents What is Site-to-Site VPN ..................................................................................................................... 1 Concepts ................................................................................................................................... 1 Working with Site-to-Site VPN ..................................................................................................... 1 Site-to-Site VPN limitations ......................................................................................................... 2 Pricing ...................................................................................................................................... 2 How AWS Site-to-Site VPN works ........................................................................................................ 3 Site-to-Site VPN Components ..................................................................................................... -
Improving Networking
IMPERIAL COLLEGE LONDON FINALYEARPROJECT JUNE 14, 2010 Improving Networking by moving the network stack to userspace Author: Matthew WHITWORTH Supervisor: Dr. Naranker DULAY 2 Abstract In our modern, networked world the software, protocols and algorithms involved in communication are among some of the most critical parts of an operating system. The core communication software in most modern systems is the network stack, but its basic monolithic design and functioning has remained unchanged for decades. Here we present an adaptable user-space network stack, as an addition to my operating system Whitix. The ideas and concepts presented in this report, however, are applicable to any mainstream operating system. We show how re-imagining the whole architecture of networking in a modern operating system offers numerous benefits for stack-application interactivity, protocol extensibility, and improvements in network throughput and latency. 3 4 Acknowledgements I would like to thank Naranker Dulay for supervising me during the course of this project. His time spent offering constructive feedback about the progress of the project is very much appreciated. I would also like to thank my family and friends for their support, and also anybody who has contributed to Whitix in the past or offered encouragement with the project. 5 6 Contents 1 Introduction 11 1.1 Motivation.................................... 11 1.1.1 Adaptability and interactivity.................... 11 1.1.2 Multiprocessor systems and locking................ 12 1.1.3 Cache performance.......................... 14 1.2 Whitix....................................... 14 1.3 Outline...................................... 15 2 Hardware and the LDL 17 2.1 Architectural overview............................. 17 2.2 Network drivers................................. 18 2.2.1 Driver and device setup....................... -
ENT-UG1060 User Guide Software API Programming
ENT-UG1060 User Guide Software API Programming Microsemi Corporation (Nasdaq: MSCC) offers a comprehensive portfolio of semiconductor and system solutions for communications, defense & security, aerospace and industrial markets. Products include high-performance and radiation-hardened analog mixed-signal integrated circuits, FPGAs, SoCs and ASICs; power management products; timing and synchronization devices and precise time solutions, setting the world's standard for time; voice processing devices; RF solutions; discrete components; security technologies and scalable anti-tamper products; Ethernet solutions; Power-over-Ethernet ICs and midspans; as well as custom design capabilities and services. Microsemi is headquartered in Aliso Viejo, Calif, and has approximately 3,600 employees globally. Learn more at www.microsemi.com. Microsemi Corporate Headquarters Microsemi makes no warranty, representation, or guarantee regarding the information contained herein or One Enterprise, Aliso Viejo, the suitability of its products and services for any particular purpose, nor does Microsemi assume any CA 92656 USA liability whatsoever arising out of the application or use of any product or circuit. The products sold hereunder and any other products sold by Microsemi have been subject to limited testing and should not Within the USA: +1 (800) 713-4113 be used in conjunction with mission-critical equipment or applications. Any performance specifications are Outside the USA: +1 (949) 380-6100 believed to be reliable but are not verified, and Buyer must conduct and complete all performance and Sales: +1 (949) 380-6136 other testing of the products, alone and together with, or installed in, any end-products. Buyer shall not rely Fax: +1 (949) 215-4996 on any data and performance specifications or parameters provided by Microsemi. -
Building Ipv6 Based Tunneling Mechanisms for Voip Security
WK,QWHUQDWLRQDO0XOWL&RQIHUHQFHRQ6\VWHPV6LJQDOV 'HYLFHV Building IPv6 Based Tunneling Mechanisms for VoIP Security Amzari J. Ghazali, Waleed Al-Nuaimy, Ali Al-Ataby, Majid A. Al-Taee Department of Electrical Engineering and Electronics University of Liverpool, UK e-mail: {amzari.ghazali, wax, ali.ataby, altaeem}@liv.ac.uk Abstract—Internet protocol version 6 (IPv6) was such as Toredo, 6to4 and manual configuration [4]. developed to resolve the IPv4 address exhaustion Despite the benefits of using IPv6, there are still problem and support new features. However, IPv6 still challenges and obstacles in implementing and comprises some defectiveness of IPv4 protocol such as practically using IPv6 VoIP [5]. The issues of the multimedia security. This paper presents IPv6-based transition from the current IPv4 network to IPv6 as tunneling mechanisms for securing Voice over Internet Protocol (VoIP) network traffic using OpenSwan IPSec well as VoIP performance for both IP versions need (site-to-site). IPSec with Triple Data Encryption to be assessed and compared. Algorithm (3DES) is used to create a Virtual Private Evaluation of VoIP performance with IPSec in Network (VPN) on top of existing physical networks. IPv4, IPv6 and 6to4 networks using Teredo for NAT Secure communication mechanisms can therefore be provided for data and control information transmitted traversal in a test LAN was previously reported in between networks. Secure VoIP-oriented mechanisms [6]. The testbed used softphones to setup calls, and on VPN IPv6 have been designed, implemented and background traffic was generated to create congestion tested successfully using open source approaches. The on the links and routers. The results demonstrated the performance of the IPv6 VoIP network is assessed feasibility of using a single Linux box to handle experimentally in terms of several performance metrics IPSec, 6to4 and NAT processing, and it was found including jitter, throughput and packet loss rate. -
Network Forensics: Following the Digital Trail in a Virtual Environment
Network Forensics: Following the Digital Trail in a Virtual Environment Master of Science Thesis in the Programme: Networks & Distributed Systems KONSTANTINOS SAMALEKAS Chalmers University of Technology University of Gothenburg Department of Computer Science and Engineering Göteborg, Sweden, October 2010 The Author grants to Chalmers University of Technology and University of Gothenburg the non-exclusive right to publish the Work electronically and in a non-commercial purpose make it accessible on the Internet. The Author warrants that he is the author to the Work, and warrants that the Work does not contain text, pictures or other material that violates copyright law. The Author shall, when transferring the rights of the Work to a third party (for example a publisher or a company), acknowledge the third party about this agreement. If the Author has signed a copyright agreement with a third party regarding the Work, the Author warrants hereby that he has obtained any necessary permission from this third party to let Chalmers University of Technology and University of Gothenburg store the Work electronically and make it accessible on the Internet. Network Forensics: Following the Digital Trail in a Virtual Environment KONSTANTINOS SAMALEKAS © KONSTANTINOS SAMALEKAS, October 2010. Examiner: ARNE LINDE Chalmers University of Technology University of Gothenburg Department of Computer Science and Engineering SE-412 96 Göteborg Sweden Telephone + 46 (0)31-772 1000 Department of Computer Science and Engineering Göteborg, Sweden, October 2010 ABSTRACT The objective of this project is to examine all important aspects of network forensics, and apply incident response methods and investigation tech- niques in practice. The subject is twofold and begins by introducing the reader to the major network forensic topics. -
SUSE Linux Enterprise Server 11 SP4 System Analysis and Tuning Guide System Analysis and Tuning Guide SUSE Linux Enterprise Server 11 SP4
SUSE Linux Enterprise Server 11 SP4 System Analysis and Tuning Guide System Analysis and Tuning Guide SUSE Linux Enterprise Server 11 SP4 Publication Date: September 24, 2021 SUSE LLC 1800 South Novell Place Provo, UT 84606 USA https://documentation.suse.com Copyright © 2006– 2021 SUSE LLC and contributors. All rights reserved. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or (at your option) version 1.3; with the Invariant Section being this copyright notice and license. A copy of the license version 1.2 is included in the section entitled “GNU Free Documentation License”. For SUSE trademarks, see http://www.suse.com/company/legal/ . All other third party trademarks are the property of their respective owners. A trademark symbol (®, ™ etc.) denotes a SUSE or Novell trademark; an asterisk (*) denotes a third party trademark. All information found in this book has been compiled with utmost attention to detail. However, this does not guarantee complete accuracy. Neither SUSE LLC, its aliates, the authors nor the translators shall be held liable for possible errors or the consequences thereof. Contents About This Guide xi 1 Available Documentation xii 2 Feedback xiv 3 Documentation Conventions xv I BASICS 1 1 General Notes on System Tuning 2 1.1 Be Sure What Problem to Solve 2 1.2 Rule Out Common Problems 3 1.3 Finding the Bottleneck 3 1.4 Step-by-step Tuning 4 II SYSTEM MONITORING 5 2 System Monitoring Utilities 6 2.1 Multi-Purpose Tools 6 vmstat 7 -
CS670: Network Security
Cristina Nita-Rotaru CS670: Network security IPsec. TLS. Sources 1. Many slides courtesy of Christo Wilson and Wil Robertson 2. IPSec Key management based on slides from B. LaMacchia 3. Analysis of the HTTPS Certificate Ecosystem, IMC 2013: https://jhalderm.com/pub/papers/https-imc13.pdf 4. Analysis of SSL certificate reissues and revocations in the wake of Heartbleed, IMC 2014: http://www.ccs.neu.edu/home/cbw/pdf/imc254-zhang.pdf 2 IPSec; TLS 1: Protecting IP: IPsec OSI/ISO Model Application Application Presentation Presentation Session Session Transport Transport Network Network Data Link Data Link Physical Layer Physical Layer 4 IPSec; TLS IPsec design goals } Design philosophy: applications cannot be trusted to implement end-to-end security properly and security should be built into the network itself } Transparent to applications (below transport layer ) } Goal: Facilitate direct IP connectivity between sensitive hosts through untrusted networks } It is designed to be extremely flexible } Different crypto algorithms and key exchange supported } Different security services compositions } Different granularities of protection 5 IPSec; TLS Security goals } IPsec provides: } access control } integrity } data origin authentication } rejection of replayed packets } confidentiality } IETF IPSEC Working Group } Documented in RFCs and Internet drafts 6 IPSec; TLS Security and deployment mechanisms } Operates based on security associations } Deployment: } Transport-mode: encapsulates an upper-layer protocol (e.g. TCP or UDP) and preapends an -
Internet Telephony PBX System IPX-2200/IPX-2500
Internet Telephony PBX System IPX-2200/IPX-2500 Internet Telephony PBX System IPX-2200 IPX-2500 1 Internet Telephony PBX System IPX-2200/IPX-2500 Copyright Copyright (C) 2016 PLANET Technology Corp. All rights reserved. The products and programs described in this User’s Manual are licensed products of PLANET Technology. This User’s Manual contains proprietary information protected by copyright, and this User’s Manual and all accompanying hardware, software, and documentation are copyrighted. No part of this User’s Manual may be copied, photocopied, reproduced, translated, or reduced to any electronic medium or machine-readable form by any means by electronic or mechanical including photocopying, recording, or information storage and retrieval systems, for any purpose other than the purchaser's personal use, and without the prior written permission of PLANET Technology. Disclaimer PLANET Technology does not warrant that the hardware will work properly in all environments and applications, and makes no warranty and representation, either implied or expressed, with respect to the quality, performance, merchantability, or fitness for a particular purpose. PLANET has made every effort to ensure that this User’s Manual is accurate; PLANET disclaims liability for any inaccuracies or omissions that may have occurred. Information in this User’s Manual is subject to change without notice and does not represent a commitment on the part of PLANET. PLANET assumes no responsibility for any inaccuracies that may be contained in this User’s Manual. PLANET makes no commitment to update or keep current the information in this User’s Manual, and reserves the right to make improvements to this User’s Manual and/or to the products described in this User’s Manual, at any time without notice. -
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Internet Security [1] VU 184.216
Internet Security [1] VU 184.216 Engin Kirda [email protected] Christopher Kruegel [email protected] The Internet Host Host Internet Host Subnet Host Subnet Host Host Subnet PPP (phone) Internet Security 1 2 Direct IP delivery • If two hosts are in the same physical network the IP datagram is encapsulated and delivered directly Host 1 Host 2 Host 3 (192.168.0.2) (192.168.0.3) (192.168.0.5) Host 4 Host 5 Host 6 (192.168.0.81) (192.168.0.99) (192.168.0.7) Internet Security 1 3 Ethernet dest (48 bits) src (48 bits) type (16) data CRC (32) 0x0800 IP Datagram Internet Security 1 4 Ethernet • Widely used link layer protocol • Carrier Sense, Multiple Access, Collision Detection • Addresses: 48 bits (e.g. 00:38:af:23:34:0f), mostly – hardwired by the manufacturer • Type (2 bytes): specifies encapsulated protocol – IP, ARP, RARP • Data: – min. 46 bytes payload (padding may be needed), max 1500 bytes • CRC (4 bytes) Internet Security 1 5 Direct IP delivery Problem: • Ethernet uses 48 bit addresses • IP uses 32 bit addresses • we want to send an IP datagram • but we only can use the Link Layer to do this Internet Security 1 6 ARP ARP (Address Resolution Protocol) • Service at the link-level, RFC 826 • maps network-addresses to link-level addresses • Host A wants to know the hardware address associated with IP address of host B • A broadcasts ARP message on physical link – including its own mapping • B answers A with ARP answer message • Mappings are cached: arp -a shows mapping Internet Security 1 7 RARP RARP (Reverse Address Resolution