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|=-----------------------------------------------------------------------=| |=--------------------=[ The Fall of Hacker Groups ]=--------------------=| |=-----------------------------------------------------------------------=| |=--------------=[ Strauss <strauss@REMOVEME.phrack.org> ]=--------------=| |=-----------------------------------------------------------------------=| --[ Contents 1 - Introduction 2 - Background 3 - Nowadays 4 - Conclusion 5 - Shouts 6 - Bibliography 7 - Notes --[ 1 - Introduction The earlier, bigger part of hacking history often had congregations as protagonists. From CCC in the early 80s to TESO in the 2000s, through LoD, MoD, cDc, L0pht, and the many other sung and unsung teams of hacker heroes, our culture was created, shaped, and immortalized by their articles, tools, and actions. This article discusses why recently we do not see many hacker groups anymore, and why the ones we do, such as Anonymous and its satellite efforts, do not succeed in having the same cultural impact as their forefathers. --[ 2 - Background Hacking is, in its very essence, an underground movement. Those who take part on it have always been the ones who (ab)used technology in ways beyond the knowledge of the larger userbase. It is tightly linked to intense efforts in unveiling previously unknown information as well as in sharing these discoveries. These premises hold true for as long as we know hackers: since computers had barely no users up until the informatic massification of today. The nature of the hacker interests intrinsically poses difficulties: growing knowledge on anything is hard. It requires heavy research, experimentation, and can turn into an endless journey if objectives are not carefully set. Just like in any field of scientific studies, it calls for a good amount of colaboration, an attitude which, luckily for hackers, was greatly enabled by the advent of computer networks and, most notably, the Internet. Computer networks increasingly made it possible to transmit unlimited and uncensored information across their geographical extent with little effort, with little costs, and in virtually no time. From the communication development standpoint, one would expect that the events that followed the 80s to our days would lead to a geometric progression in the number of hacker communities. In effect, hacking has arguably grown. Hacker communities, definitely not. So what went wrong? --[ 3 - Nowadays We live in days of limited creativity. Moreover, as contraditory as it may seem, it looks particularly rare for creativity to arise from groups or teams. Communities, rather than individuals, should be more intellectually empowered to create, but lately we have been watching the force of the solo, the age of the ego. That, of course, when we do see anything that catches our attention for originality, which is an ever scarcer pleasure. In "Time Wars" [1], Mark Fisher explains that post-fordism has taken us to this catatonic inability to innovate. Our nearly obsessive compulsion for work consumes not only our time, in the literal form of labor hours, but our minds, by distracting us from everything else we could be doing otherwise. These distractions include our unceasing connection to ubiquous media (e.g. the frequent checks for new e-mail, or accesses to social networks on mobile devices) as well as an increased concern with financial stability and provisioning, a concern that grows as welfare is invariably trimmed by both the governments and the private sector. It is important to note that our capitalist worries are more deeply rooted in us than might seem at first, even in the most politically diverse people. Supporting oneself is not easy, it does not come for free. Getting some education, finding a job, staying up-to-date... regardless of what your aspirations are, whatever you feel obliged to do is probably a lot, already. And it likely involves a prevalence of "minding your own business". The unsettlement created in our thoughts affects intellectual solidarity in even more severe ways than it does individual creation. Simply put, if it is already so difficult for one person to focus away from these "distractions" and into inspired productivity, let alone for a group to join in a true collective mind. The ties that bind collective-minded parties together take dedication to build, and our egotistical concerns do not help (see note "A"). Not only is commitment required for the actual work to be accomplished, but also to identify the shared values and goals that enable true human connectivity. Notice this does not concern _collaboration_ as much as it does _collectiveness_. Collaboration typically breaks down the creative process in a way it can be incrementally achieved with very self-sufficient, individualistic contributions. Such is the case in most open-source software projects. Roles are very well segregated so that a minimum of human integration is required, as far as most modern software development processes go, anyway. A true "hive mind" [2] cannot exist without the support from a stronger, more unisonant cognitive bond. Funny enough, the popular variants of LOIC, the DDoS tool used by "Anonymous", contain a "hive mind" feature (i.e. getting a target automatically from a given IRC server and channel and firing your packets against it). You wish it was that easy. The concept of the "conscience collective" was first established by Emile Durkheim who, in his 1893 book "The Division of Labor in Society", expressed 'that the more primitive societies are, the more resemblances (particularly as reflected in primitive religion) there are among the individuals who compose them; inversely, the more civilized a people, the more easily distinguishable its individual members', as put by R. Alun Jones [3]. Well, following (or despite) the prosperous adoption of atheism and agnosticism as professed in the Internet and other popular media, it is understood that religious beliefs are in a low, taking a bit of what socities traditionally saw as a point of unity. In fact, there seems to be an ever growing search for uniqueness in the modern man, especially that from the apparently overpopulated metropolises (see note "B"). In this never-ending crowd of interesting, outstanding personas, we want to shine somehow, to prove ourselves different and original. In the end, it turns into a pointless battle, against God-knows-who, for apparent singularity. Instead of reaching for the fellow man, we want to set ourselves apart, and thus, remarkable. --[ 4 - Conclusion Modern life nearly conspires against the collective. We are tormented by a relentless flow of information as well as the daily worries of an eternally insecure, unwarranted life. Furthermore, we dread the thought of being alike, of sharing multiple views and opinions. As such, we are turning progressively judgemental of who we should be partnering with, on the basis that "they do not understand". In hacking, it yet implicates on the delicate subject of trust, which would require an essay on itself, given the undeniable importance the matter has acquired over the years. If our thoughts on creating hacker groups were to be summarized, this is how they would look: No one ever feels like we do. They are not to be trusted and we do not have the time for them. The only attitude consonant to our search for a comfortable, safe life is to constrain ourselves to our own limitations, ignore the intelligent life out there, and surrender to the mediocracy that our society has condemned our leisure time to. --[ 5 - Shouts My only acknowledgements go to whoever reads this through and puts his/her thoughts to it. I eagerly await for your comments. --[ 6 - Bibliography 1 - "Time Wars", Mark Fisher - (pagina’s niet in het hoofdmenu) | Gonzo (circus) | Muziek.Kunst.Meer. incubate-special-exclusive-essay-time-wars-by-mark-fisher/ 2 - "Collective Consciousness", Wikipedia - Collective consciousness - Wikipedia, the free encyclopedia 3 - Excerpt of "Emile Durkheim: An Introduction to Four Major Works", Robert Alun Jones - The Division of Labor in Society (1893) --[ 7 - Notes A) In respect to social networks, while they are a valid community-building mechanism in nature, selfishness prevails in common usage, by means of the indulgent pleasure that fuels chronic "pluggedness", at times voyeur, at times exhibitionist and needy. It is arguably the case, though, that the globalizing aspect of the Internet has brought the feeling of upsetting commonality to the citizens of even the more unpopulated places. Un articol interesant.

Palo Alto Networks today shared details of a security vulnerability in the Android operating system that could allow an attacker to hijack the installation of a what appears to be a legitimate Android application and modify or replace it with malware. The network security firm said an estimated 49.5 percent of current Android users are impacted by the flaw, which if exploited, could potentially give attackers full access to a compromised device, including usernames, passwords, and sensitive data. Fortunately, the risk for most typical Android users is low, as the vulnerability only affects applications downloaded from third-party app stores, not the official Google Play store, which downloads files into a protected space and cannot be overwritten by an attacker. Discovered by Palo Alto Networks researcher Zhi Xu, the vulnerability exploits a flaw in Android’s “PackageInstaller” system service, allowing attackers to silently gain unlimited permissions in compromised devices, the company said. Android Hijacking VulnerabilityPalo Alto Networks summarized the flaw as follows: • During installation, Android applications list the permissions requested to perform their function, such as a messaging app requesting access to SMS messages, but not GPS location. • This vulnerability allows attackers to trick users by displaying a false, more limited set of permissions, while potentially gaining full access to the services and data on the user’s device, including personal information and passwords. • While users believe they are installing a flashlight app, or a mobile game, with a well-defined and limited set of permissions, they are actually running potentially dangerous malware. “On affected platforms, we discovered that the PackageInstaller has a ‘Time of Check’ to ‘Time of Use’ vulnerability,” the company explained in a blog post. “In layman’s terms, that simply means that the APK file can be modified or replaced during installation without the user’s knowledge. The Installer Hijacking vulnerability affects APK files downloaded to unprotected local storage only because the protected space of Play Store app cannot be accessed by other installed apps.” Palo Alto Networks said it has worked with Google and Android device manufacturers including Samsung and Amazon to help protect users and patch the vulnerability in affected versions of Android, however, some older-version Android devices may remain vulnerable. Palo Alto Networks recommends the following for enterprises concerned about the risk of malware through Android devices: • On vulnerable devices, only install software applications from Google Play; these files are downloaded into a protected space, which cannot be overwritten by the attacker. • Deploy mobile devices with Android 4.3_r0.9 and later, but keep in mind that some Android 4.3 devices are found to be vulnerable. • Do not provide apps with permission to access logcat. Logcat is a system log, which can be used to simplify and automate the exploit. Android 4.1 and later versions of Android by default forbid apps from accessing logcat of system and other installed apps. But an installed app could still manage to get access to other apps’ logcat on rooted mobile devices using Android 4.1 or later. • Do not allow enterprise users to use rooted devices with enterprise networks. According to Google, the Android Open Source Project includes patches for the vulnerability for Android 4.3 and later, which can be found here. According to Google’s Android Security Team, no attempts to exploit the vulnerability on user devices has been detected. Palo Alto Networks also released a vulnerability scanner app in the Google Play store which it has open sourced on Github. Ryan Olson, Unit 42 Intelligence Director at Palo Alto Networks, told SecurityWeek that no CVE has been assigned for the flaw, as Google did not request one. Additional technical details and information are available in the blog post from Palo Alto Networks. Sursa

SATELLITE NETWORKING PRINCIPLES AND PROTOCOLS SECOND EDITION Author: Zhili Sun University of Surrey, UK Contents List of Figures xix List of Tables xxv About the Author xxvii Preface xxix Acknowledgements xxxi 1 Introduction 1 1.1 Applications and Services of Satellite Networks 1 1.1.1 Roles of Satellite Networks 2 1.1.2 Network Software and Hardware 4 1.1.3 Satellite Network Interfaces 4 1.1.4 Network Services 5 1.1.5 Applications 5 1.2 ITU-R Definitions of Satellite Services 5 1.2.1 Fixed Satellite Service (FSS) 6 1.2.2 Mobile Satellite Service (MSS) 6 1.2.3 Broadcasting Satellite Service (BSS) 6 1.2.4 Other Satellite Services 6 1.3 ITU-T Definitions of Network Services 6 1.3.1 Interactive Services 7 1.3.2 Distribution Services 7 1.4 Internet Services and Applications 8 1.4.1 World Wide Web (WWW) 8 1.4.2 File Transfer Protocol (FTP) 9 1.4.3 Telnet 9 1.4.4 Electronic Mail (email) 10 1.4.5 Multicast and Content Distribution 10 1.4.6 Voice over Internet Protocol (VoIP) 10 1.4.7 Domain Name System (DNS) 11 1.5 Circuit-switching Network 11 1.5.1 Connection Set Up 12 1.5.2 Signalling 13 1.5.3 Transmission Multiplexing Hierarchy based on FDM 13 1.5.4 Transmission Multiplexing Hierarchy based on TDM 13 1.5.5 Space Switching and Time Switching 15 1.5.6 Coding Gain of Forward Error Correction (FEC) 16 1.6 Packet-switching Networks 17 1.6.1 Connection-oriented Approach 18 1.6.2 Connectionless Approach 19 1.6.3 Relationship between Circuit-switching and Packet-switching 20 1.6.4 Considerations of Packet Network Designs 20 1.6.5 Packet Header and Payload 21 1.6.6 Complexity and Heterogeneous Networks 21 1.6.7 Performance of Packet Transmissions 21 1.6.8 Impact of Bit Level Errors on Packet Level 22 1.7 OSI/ISO Reference Model 22 1.7.1 Protocol Terminology 23 1.7.2 Layering Principle 23 1.7.3 Functions of the Seven Layers 23 1.7.4 Fading of the OSI/ISO Reference Model 24 1.8 The ATM Protocol Reference Model 25 1.8.1 Narrowband ISDN (N-ISDN) 25 1.8.2 Broadband ISDN (B-ISDN) 25 1.8.3 ATM Technology 25 1.8.4 Reference Model 26 1.8.5 Problems: Lack of Available Services and Applications 26 1.9 Internet Protocols Reference Model 27 1.9.1 Network Layer: IP Protocol 27 1.9.2 Network Technologies 27 1.9.3 Transport Layer: TCP and UDP 28 1.9.4 Application Layer 28 1.9.5 QoS and Control on Resources 28 1.10 Satellite Network 28 1.10.1 Access Network 29 1.10.2 Transit Network 29 1.10.3 Broadcast Network 29 1.10.4 Space Segment 29 1.10.5 Ground Segment 31 1.10.6 Satellite Orbits 31 1.10.7 Satellite Transmission Frequency Bands 32 1.11 Characteristics of Satellite Networks 34 1.11.1 Propagation Delay 34 1.11.2 Propagation Loss and Power Limited 35 1.11.3 Orbit Space and Bandwidth Limited for Coverage 35 1.11.4 Operational Complexity for LEO 35 1.12 Channel Capacity of Digital Transmissions 35 1.12.1 The Nyquist Formula for Noiseless Channels 36 1.12.2 The Shannon Theorem for Noise Channels 36 1.12.3 Channel Capacity Boundary 36 1.12.4 The Shannon Power Limit (-1.6 dB) 36 1.12.5 Shannon Bandwidth Efficiency for Large Eb/N0 37 1.13 Internetworking with Terrestrial Networks 38 1.13.1 Repeaters at the Physical Layer 38 1.13.2 Bridges at the Link Layer 38 1.13.3 Switches at the Physical, Link and Network Layers 39 1.13.4 Routers for Interconnecting Heterogeneous Networks 39 1.13.5 Protocol Translation, Stacking and Tunnelling 39 1.13.6 Quality of Service (QoS) 40 1.13.7 End-user QoS Class and Requirements 40 1.13.8 Network Performance 41 1.13.9 QoS and NP for Satellite Networking 42 1.14 Digital Video Broadcasting (DVB) 43 1.14.1 The DVB Standards 44 1.14.2 Transmission System 44 1.14.3 Adaptation to Satellite Transponder Characteristics 45 1.14.4 Channel Coding 46 1.14.5 ReedSolomon (RS) Outer Coding, Interleaving and Framing 47 1.14.6 Inner Convolutional Coding 48 1.14.7 Baseband Shaping and Modulation 49 1.14.8 Error Performance Requirements 50 1.15 DVB-S Satellite Delivery 50 1.15.1 MPEG-2 Baseband Processing 51 1.15.2 Transport Stream (TS) 52 1.15.3 Service Objectives 52 1.15.4 Satellite Channel Adaptation 52 1.15.5 DVB Return Channel over Satellite (DVB-RCS) 53 1.15.6 TCP/IP over DVB 54 1.16 DVB Satellite Second Generation (DVB-S2) 54 1.16.1 Technology Novelty in the DVB-S2 55 1.16.2 Transmission System Architecture 56 1.16.3 Error Performance 58 1.17 DVB Satellite Services to Handheld Devices (DVB-SH) 59 1.17.1 Transmission System Architecture 60 1.17.2 Common Functions for both TDM and OFDM Modes 61 1.17.3 Functions for Single Carrier (TDM) Mode 62 1.17.4 Functions for Multi Carrier (OFDM) Mode 65 1.17.5 DVB-RCS2 69 1.18 Historical Development of Computer and Data Networks 69 1.18.1 Dawn of the Computer and Data Communications Age 70 1.18.2 Development of Local Area Networks (LANs) 70 1.18.3 Development of WANs and ISO/OSI 70 1.18.4 Birth of the Internet 70 1.18.5 Integration of Telephony and Data Networks 70 1.18.6 Development of Broadband Integrated Networks 71 1.18.7 The Killer Application WWW and Internet Evolutions 71 1.19 Historical Development of Satellite Communications 71 1.19.1 Start of Satellite and Space Eras 71 1.19.2 Early Satellite Communications: TV and Telephony 72 1.19.3 Development of Satellite Digital Transmission 72 1.19.4 Development of Direct-to-Home (DTH) Broadcast 72 1.19.5 Development of Satellite Maritime Communications 72 1.19.6 Satellite Communications in Regions and Countries 72 1.19.7 Satellite Broadband Networks and Mobile Networks 73 1.19.8 Internet over Satellite Networks 73 1.20 Convergence of Network Technologies and Protocols 73 1.20.1 Convergence of Services and Applications in User Terminals 73 1.20.2 Convergence of Network Technologies 74 1.20.3 Convergence of Network Protocols 75 1.20.4 Satellite Network Evolution 75 Further Readings 77 Exercises 78 2 Satellite Orbits and Networking Concepts 79 2.1 Laws of Physics 80 2.1.1 Keplers Three Laws 80 2.1.2 Newtons Three Laws of Motion and The Universal Law of Gravity 80 2.1.3 Keplers First Law: Satellite Orbits 81 2.1.4 Keplers Second Law: Area Swept by a Satellite Vector 83 2.1.5 Keplers Third Law: Orbit Period 83 2.1.6 Satellite Velocity 84 2.2 Satellite Orbit Parameters 85 2.2.1 Semi-Major Axis (a) 85 2.2.2 Eccentricity (e) 85 2.2.3 Inclination of Orbit (i) 85 2.2.4 Right Ascension of the Node (?) and Argument of Perigee (??) 86 2.3 Useful Orbits 87 2.3.1 Geosynchronous Earth Orbits 87 2.3.2 Geostationary Earth Orbits (GEOs) 87 2.3.3 High Elliptical Orbits (HEOs) 88 2.3.4 Notations of Low Earth Orbit (LEO) Satellite Constellations 88 2.3.5 Orbital Perturbations 89 2.3.6 Satellite Altitude and Coverage 89 2.3.7 Antenna Gain and Beam-width Angle 90 2.3.8 Coverage Calculations 91 2.3.9 Distance and Propagation Delay from Earth Station to Satellite 92 2.4 Satellite Link Characteristics and Modulations for Transmissions 93 2.4.1 Satellite Link Characteristics 93 2.4.2 Modulation Techniques 95 2.4.3 Phase Shift Keying (PSK) Schemes for Satellite Transmissions 96 2.4.4 Binary Phase Shift Keying (BPSK) 96 2.4.5 Quadrature PSK (QPSK) 97 2.4.6 Gaussian-filtered Minimum Shift Keying (GMSK) 97 2.4.7 Bit Error Rate (BER): the Quality Parameter of Modulation Schemes 98 2.4.8 Satellite Networking in the Physical Layer 100 2.5 Forward Error Correction (FEC) 101 2.5.1 Linear Block Codes 101 2.5.2 Cyclic Codes 102 2.5.3 Trellis Coding and Convolutional Codes 102 2.5.4 Concatenated Codes 103 2.5.5 Turbo Codes 103 2.5.6 Performance of FEC 104 2.6 Multiple Access Techniques 105 2.6.1 Frequency Division Multiple Access (FDMA) 106 2.6.2 Time Division Multiple Access (TDMA) 106 2.6.3 Code Division Multiple Access (CDMA) 107 2.6.4 Comparison of FDMA, TDMA and CDMA 108 2.7 Bandwidth Allocation 108 2.7.1 Fixed Assignment Access 109 2.7.2 Demand Assignment 109 2.7.3 Random Access 109 2.8 Satellite Networking Issues 110 2.8.1 Single-hop Satellite Connections 110 2.8.2 Multi-hop Satellite Connections 110 2.8.3 Inter-satellite Links (ISL) 111 2.8.4 Handovers 112 2.8.5 Satellite Intra-beam and Inter-beam Handovers 114 2.8.6 Earth Fixed Coverage versus Satellite Fixed Coverage 114 2.8.7 Routing within a Constellation of Satellite Networks 115 2.8.8 Internetworking 116 2.8.9 Satellite Availability and Diversity 116 Further Readings 118 Exercises 118 3 B-ISDN ATM and Internet Protocols 119 3.1 ATM Protocol and Fundamental Concepts 119 3.1.1 Packetisation Delay 121 3.1.2 Queuing Delay 121 3.1.3 Compromise Solution Between North America and Europe 122 3.2 ATM Layer 123 3.2.1 The GFC Field 123 3.2.2 The VPI and VCI Fields 123 3.2.3 The CLP Field 125 3.2.4 The PT Field 126 3.2.5 The HEC Field 126 3.3 ATM Adaptation Layer (AAL) 126 3.3.1 AAL1 for Class A 127 3.3.2 AAL2 for Class B 129 3.3.3 AAL3/4 for Classes C and D 129 3.3.4 AAL5 for Internet Protocol 130 3.4 The Physical Layer 131 3.4.1 The Physical Medium (PM) Sublayers 131 3.4.2 The Transmission Convergence (TC) Sublayer 131 3.4.3 ATM Cell Transmissions 132 3.5 ATM Interfaces and ATM Networking 134 3.5.1 UserNetwork Access 134 3.5.2 Network Node Interconnections 135 3.5.3 ATM DXI 136 3.5.4 B-ICI 136 3.5.5 Permanent Virtual Connections versus Switched Virtual Connections 136 3.5.6 ATM Signalling 137 3.5.7 ATM Addressing 137 3.5.8 Address Registration 139 3.6 Network Traffic, QoS and Performance Issues 139 3.6.1 Traffic Descriptors 140 3.6.2 QoS Parameters 140 3.6.3 Performance Issues 140 3.7 Network Resource Management 141 3.7.1 Connection Admission Control (CAC) 142 3.7.2 UPC and NPC 142 3.7.3 Priority Control and Congestion Control 142 3.7.4 Traffic Shaping 143 3.7.5 Generic Cell Rate Algorithm (GCRA) 143 3.7.6 Leaky Bucket Algorithm (LBA) 143 3.7.7 Virtual Scheduling Algorithm (VSA) 146 3.8 Internet Protocols 146 3.8.1 Internet Networking Basics 147 3.8.2 Protocol Hierarchies 147 3.8.3 Connectionless Network Layer 148 3.8.4 The IP Packet Format 148 3.8.5 IP Address 150 3.8.6 Mapping Between Internet and Physical Network Addresses 151 3.8.7 ARP, RARP and HDCP 152 3.9 Internet Routing Protocols 152 3.9.1 The Interior Gateway Routing Protocol (IGRP) 152 3.9.2 The Exterior Gateway Routing Protocol (EGRP) 153 3.10 Transport Layer Protocols: TCP and UDP 153 3.10.1 Transmission Control Protocol (TCP) 153 3.10.2 The TCP Segment Header Format 154 3.10.3 Connection Set Up and Data Transmission 155 3.10.4 Congestion and Flow Control 156 3.10.5 User Datagram Protocol (UDP) 157 3.11 IP and ATM Internetworking 158 3.11.1 Packet Encapsulation 159 3.11.2 IP and ATM Address Resolution 160 Further Readings 161 Exercises 161 4 Satellite Internetworking with Terrestrial Networks 163 4.1 Networking Concepts 163 4.2 Networking Terminology 165 4.2.1 Private Network 165 4.2.2 Public Network 165 4.2.3 Quality Aspects of Telephony Services 166 4.2.4 IP Based Network 166 4.3 Network Elements and Connections 167 4.3.1 Network Terminals 167 4.3.2 Network Nodes 168 4.3.3 Network Connections 168 4.3.4 End-to-End Paths 169 4.3.5 Reference Configurations 169 4.4 Network Traffic and Signalling 170 4.4.1 User Traffic and Network Services 170 4.4.2 Signalling Systems and Signalling Traffic 171 4.4.3 In-band Signalling 172 4.4.4 Out-of-Band Signalling 173 4.4.5 Associated and Disassociated Channel Signalling 173 4.4.6 Network Management 174 4.4.7 Network Operation Systems and Mediation Functions 175 4.5 Access and Transit Transmission Networks 176 4.5.1 Analogue Telephony Networks 177 4.5.2 Telephony Network Traffic Engineering Concept 177 4.5.3 Access to Satellite Networks in the Frequency Domain 178 4.5.4 On-Board Circuit Switching 179 4.6 Digital Telephony Networks 180 4.6.1 Digital Multiplexing Hierarchy 180 4.6.2 Satellite Digital Transmission and On-Board Switching 181 4.6.3 Plesiochronous Digital Hierarchy (PDH) 181 4.6.4 Limitations of PDH 181 4.7 Synchronous Digital Hierarchy (SDH) 182 4.7.1 Development of SDH 183 4.7.2 The SDH Standards 183 4.7.3 Mapping from PDH to SDH 184 4.7.4 The Benefits of SDH 185 4.7.5 Synchronous Operation 185 4.7.6 Synchronous Optical Network (SONET) 187 4.7.7 SDH Over Satellite The Intelsat Scenarios 188 4.8 Hypothetical References for Satellite Networks 189 4.8.1 ITU-T Hypothetical Reference Connection (HRX) 189 4.8.2 ITU-R Hypothetical Reference Digital Path (HRDP) for Satellite 190 4.8.3 Performance Objectives 191 4.9 Satellites and MANET 191 4.9.1 Networking Scenarios 193 4.10 Interworking with Heterogeneous Networks 197 4.10.1 Services 197 4.10.2 Addressing 198 4.10.3 Routing 198 4.10.4 Evolution 198 Further Readings 199 Exercises 200 5 B-ISDN ATM over Satellite Networks 201 5.1 Background 201 5.1.1 Networking Issues 202 5.1.2 Satellite Services in the B-ISDN Networking Environment 202 5.2 Design Issues of Satellite B-ISDN ATM Systems 204 5.2.1 Propagation Delay 204 5.2.2 Attenuation and Constraints 205 5.3 The GEO Satellite B-ISDN ATM Networking Architecture 206 5.3.1 Ground Segment 206 5.3.2 Space Segment 207 5.3.3 Satellite Bandwidth Resource Management 207 5.3.4 Connection Admission Control (CAC) 209 5.3.5 Network Policing Functions 209 5.3.6 Reactive Congestion Control 209 5.4 Advanced Satellite B-ISDN ATM Networks 210 5.4.1 Radio Access Layer 210 5.4.2 On-Board Processing (OBP) Characteristics 211 5.4.3 B-ISDN ATM On-Board Switch 211 5.4.4 Multibeam Satellites 214 5.4.5 LEO/MEO Satellite Constellations 215 5.4.6 Inter-Satellite Links (ISL) 215 5.4.7 Mobility Management 216 5.4.8 Use of Higher Frequency Spectrum 216 5.5 B-ISDN ATM Performance 217 5.5.1 Layered Model of Performance for B-ISDN 217 5.5.2 Network Performance Parameters 218 5.5.3 Impact of Satellite Burst Errors on the ATM Layer 220 5.5.4 Impact of Burst Errors on AAL Protocols 221 5.5.5 Error Control Mechanisms 221 5.5.6 Enhancement Techniques for Broadband Satellite Networks 222 5.6 Evolution of Broadband Satellite Systems 224 Further Readings 225 Exercises 225 6 Internet Protocol (IP) over Satellite Networks 227 6.1 Different Viewpoints of Satellite Networking 227 6.1.1 Protocol-centric Viewpoint of Satellite IP Network 228 6.1.2 Satellite-centric Viewpoint of Global Networks and the Internet 229 6.1.3 Network-centric Viewpoint of Satellite Networks 230 6.2 IP Packet Encapsulation 231 6.2.1 Basic Concepts 231 6.2.2 High-level Data Link Control (HDLC) Protocol 232 6.2.3 Point-to-Point Protocol (PPP) 232 6.2.4 Media Access Control 233 6.2.5 IP Over Satellite 233 6.3 Satellite IP Networking 233 6.3.1 Routing On-Board Satellites 235 6.3.2 IP Mobility in Satellite Networks 235 6.3.3 Address Resolution 237 6.4 IP Multicast Over Satellite 237 6.4.1 IP Multicast Concepts 238 6.4.2 IP Multicast Addressing 239 6.4.3 Multicast Group Management 239 6.4.4 IP Multicast Routing 240 6.4.5 IP Multicast Scope 241 6.4.6 IGMP Behaviour in Satellite Environments 241 6.4.7 Multicast Routing Protocols in Satellite Environments 243 6.4.8 Reliable Multicast Protocols Over Satellites 243 6.5 Basic Network Security Mechanisms 245 6.5.1 Security Approaches 245 6.5.2 Single-direction Hashing Functions 246 6.5.3 Symmetrical Codes (With Secret Keys) 246 6.5.4 Asymmetrical Codes (With Public/Private Keys) 247 6.6 Satellite Networking Security 248 6.6.1 IP Security (IPsec) 248 6.6.2 Firewall and VPN 249 6.6.3 IP Multicast Security 250 6.7 Internet Quality of Service (IP QoS) 250 6.7.1 Layered Model of Performance for IP Service 251 6.7.2 IP Packet Transfer Performance Parameters 252 6.7.3 IP Network Performance Objectives for QoS Classes 253 6.7.4 Guidance on IP QoS Class Usage 254 6.8 Integrated Services (Intserv) Architectures for QoS 254 6.8.1 Integrated Services Architecture (ISA) Principles 255 6.8.2 Resource Reservation Protocol (RSVP) 256 6.8.3 Intserv Service Classes 257 6.9 Differentiated Services (Diffserv) for QoS 258 6.9.1 Diffserv Architecture 258 6.9.2 Traffic Classification 260 6.9.3 Traffic Conditioning 261 6.9.4 Diffserv Per Hop Behaviour (PHB) 261 6.9.5 Supporting Intserv Across the Satellite Network Diffserv Domain 263 6.10 DVB Over Satellite 264 6.10.1 MPEG-2 Source Coding and Multiplexing DVB-S Streams 265 6.10.2 DVB-S System 266 6.10.3 DVB Security 268 6.10.4 Conditional Access in DVB-S 268 6.10.5 DVB-RCS Interactive Service and IP over DVB 270 6.10.6 DVB-RCS Security 271 6.10.7 IP Multicast Security 271 6.11 DVB-S and DVB-RCS Network Architecture 272 6.11.1 On-Board Processor (OBP) 273 6.11.2 Management Station (MS) 274 6.11.3 Regenerative Satellite Gateway (RSGW) 274 6.11.4 Return Channel Satellite Terminal (RCST) 275 6.11.5 Network Interface 275 6.11.6 Network System Characteristics 276 6.12 Network Protocol Stack Architecture 276 6.13 The Physical Layer (PHY) 277 6.13.1 Up-link (DVB-RCS Compliant) 277 6.13.2 Time Slots 278 6.13.3 Frames 278 6.13.4 Superframes 280 6.13.5 Carrier Type and Frame Composition 280 6.13.6 Uplink MF-TDMA Channel Frequency Plan 281 6.13.7 Downlink (DVB-S Compliant) 282 6.13.8 RCS Terminal (RCST) Transmission 283 6.14 Satellite MAC (SMAC) Layer 284 6.14.1 Transport Mechanisms 284 6.14.2 MPEG-2, DVB-S and DVB-RCS Tables 285 6.15 Multi Protocol Encapsulation (MPE) 288 6.16 Satellite Link Control Layer 290 6.16.1 Session Control 290 6.16.2 Resource Control 293 6.16.3 Capacity Request Categories 294 6.16.4 Connection Control 294 6.17 Quality of Service (QoS) 297 6.17.1 Traffic Classes 297 6.17.2 Flow Classification 298 6.17.3 Link Layer Connection QoS Adaptation 298 6.18 Network Layer 299 6.18.1 IP Routing and Address Resolution 299 6.18.2 IP Multicast Star and Mesh Configurations 301 Further Readings 303 Exercises 305 7 Impact of Satellite Networks on Transport Layer Protocols 307 7.1 Introduction 308 7.1.1 Application Characteristics 308 7.1.2 Client and Server Host Parameters 309 7.1.3 Satellite Network Configurations 309 7.1.4 TCP and Satellite Channel Characteristics 310 7.1.5 TCP Flow Control, Congestion Control and Error Recovery 311 7.2 TCP Performance Analysis 313 7.2.1 First TCP Segment Transmission 313 7.2.2 TCP Transmission in the Slow-start Stage 314 7.2.3 TCP Transmission in the Congestion Avoidance Stage 314 7.3 Slow-start Enhancement for Satellite Networks 315 7.3.1 TCP for Transactions 316 7.3.2 Slow-start and Delayed Acknowledgement (ACK) 316 7.3.3 Larger Initial Window 317 7.3.4 Terminating Slow-start 317 7.4 Loss Recovery Enhancement 318 7.4.1 Fast Retransmission and Fast Recovery 318 7.4.2 Selective Acknowledgement (SACK) 319 7.4.3 SACK Based Enhancement Mechanisms 319 7.4.4 ACK Congestion Control 320 7.4.5 ACK Filtering 320 7.4.6 Explicit Congestion Notification 321 7.4.7 Detecting Corruption Loss 322 7.4.8 Congestion Avoidance Enhancement Policy 322 7.5 Enhancements for Satellite Networks Using Interruptive Mechanisms 323 7.5.1 TCP Spoofing 323 7.5.2 Cascading TCP or Split TCP 324 7.5.3 Other Considerations for Satellite Networking 325 7.6 Impacts on Applications 325 7.6.1 Bulk Data Transfer 325 7.6.2 Interactive Applications 326 7.6.3 Distributed Caching for Internet Services and Applications 326 7.6.4 Web Caching in Satellite Networks 327 7.7 Real-time Transport Protocol (RTP) 328 7.7.1 Basics of RTP 328 7.7.2 RTP Control Protocol (RTCP) 331 7.7.3 Sender Report (SR) Packets 332 7.7.4 Receiver Report (RR) Packets 333 7.7.5 Source Description (SDES) RTCP Packet 333 7.7.6 SAP and SIP Protocols for Session Initiations 334 7.7.7 Session Directory Service (SDS) 336 7.8 Voice over IP 336 7.8.1 Gateway Decomposition 336 7.8.2 Protocols 336 7.8.3 Gatekeepers 337 7.8.4 Multimedia Conferencing (MMC) 337 7.8.5 Conference Control 337 Further Readings 337 Exercises 338 8 Next Generation Internet (NGI) over Satellite 341 8.1 Introduction 342 8.2 New Services and Applications 342 8.2.1 Internet Integrated Services 343 8.2.2 Elastic and Inelastic Traffic 343 8.2.3 QoS Provision and Network Performance 344 8.3 Traffic Modelling and Characterisation 344 8.3.1 Traffic Engineering Techniques 345 8.3.2 Traffic Modelling 345 8.3.3 Statistical Methods for Traffic Modelling 346 8.3.4 Renewal Models 346 8.3.5 Markov Models 346 8.3.6 Fluid Models 347 8.3.7 Auto-regressive and Moving Average Models 347 8.3.8 Self-similar Models 348 8.4 The Nature of Internet Traffic 348 8.4.1 World Wide Web (WWW) 348 8.4.2 Pareto Distribution Model for Self-similar Traffic 350 8.4.3 Fractional Brownian Motion (FBM) Process 350 8.4.4 Consideration of User Behaviour in Traffic Modelling 351 8.4.5 Voice Traffic Modelling 352 8.4.6 On-off Model for Voice Traffic 354 8.4.7 Video Traffic Modelling 355 8.4.8 Multi-layer Modelling for WWW Traffic 356 8.5 Traffic Engineering 357 8.5.1 Traffic Engineering Principles 358 8.5.2 Internet Traffic Engineering 360 8.6 Multi-protocol Label Switching (MPLS) 361 8.6.1 MPLS Forwarding Paradigm 362 8.6.2 MPLS Basic Operation 363 8.6.3 MPLS and Diffserv Interworking 366 8.6.4 MPLS and ATM Interworking 367 8.6.5 MPLS with Traffic Engineering (MPLS-TE) 368 8.7 Internet Protocol Version 6 (IPv6) 369 8.7.1 Basics of Internet Protocol Version 6 (IPv6) 369 8.7.2 IPv6 Addressing 371 8.7.3 IPv6 Networks over Satellites 374 8.7.4 IPv6 Transitions 375 8.7.5 IPv6 Tunnelling Through Satellite Networks 375 8.7.6 The 6to4 Translation via Satellite Networks 376 8.7.7 Issues with 6to4 377 8.7.8 Future Development of Satellite Networking 378 Further Readings 380 Exercises 381 Index 383 Download: http://www68.zippyshare.com/v/XtssMyns/file.html

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Germany and France will discuss the possibility of setting up a pan-European internet network in order to avoid US government spying. Germany’s chancellor Angela Merkel announced in her weekly podcast that she intended to raise the idea in a meeting with French president François Hollande on Wednesday, it has been widely reported. The network would ensure any emails and other forms of communication sent over the internet would not need to travel via providers in the US. “Above all we’ll talk about European providers that offer security to our citizens, so that one shouldn’t have to send emails and other information across the Atlantic,” she said, as reported by The Independent. “Rather one could build up a communications network inside Europe.” Read more: - http://www.v3.co.uk/v3-uk/news/2329201/prism-germany-and-france-want-eu-only-internet-to-avoid-us-spies - http://www.independent.co.uk/news/world/europe/angela-merkel-proposes-european-network-to-beat-nsa-spying-9132388.html