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Foreword v
Chapter  Introduction
1.1 Architectural Principles
1.1.1 Packets, Connections, and Datagrams
1.1.2 The End-to-End Argument and Fate Sharing
1.1.3 Error Control and Flow Control
1.2 Design and Implementation
1.2.1 Layering
1.2.2 Multiplexing, Demultiplexing, and Encapsulation in Layered
Implementations
1.3 The Architecture and Protocols of the TCP/IP Suite
1.3.1 The ARPANET Reference Model
1.3.2 Multiplexing, Demultiplexing, and Encapsulation in TCP/IP
1.3.3 Port Numbers
1.3.4 Names, Addresses, and the DNS
1.4 Internets, Intranets, and Extranets
1.5 Designing Applications
1.5.1 Client/Server
1.5.2 Peer-to-Peer
1.5.3 Application Programming Interfaces (APIs)
Preface to the Second Edition vii
Adapted Preface to the First Edition xiii
1.6 Standardization Process
1.6.1 Request for Comments (RFC)
1.6.2 Other Standards
1.7 Implementations and Software Distributions
1.8 Attacks Involving the Internet Architecture
1.9 Summary
1.10 References
Chapter  The Internet Address Architecture
2.1 Introduction
2.2 Expressing IP Addresses
2.3 Basic IP Address Structure
2.3.1 Classful Addressing
2.3.2 Subnet Addressing
2.3.3 Subnet Masks
2.3.4 Variable-Length Subnet Masks (VLSM)
2.3.5 Broadcast Addresses
2.3.6 IPv6 Addresses and Interface Identifiers
2.4 CIDR and Aggregation
2.4.1 Prefixes
2.4.2 Aggregation
2.5 Special-Use Addresses
2.5.1 Addressing IPv4/IPv6 Translators
2.5.2 Multicast Addresses
2.5.3 IPv4 Multicast Addresses
2.5.4 IPv6 Multicast Addresses
2.5.5 Anycast Addresses
2.6 Allocation
2.6.1 Unicast
2.6.2 Multicast
2.7 Unicast Address Assignment
2.7.1 Single Provider/No Network/Single Address
2.7.2 Single Provider/Single Network/Single Address
2.7.3 Single Provider/Multiple Networks/Multiple Addresses
2.7.4 Multiple Providers/Multiple Networks/Multiple Addresses
(Multihoming)
Contents xvii
2.8 Attacks Involving IP Addresses
2.9 Summary
2.10 References
Chapter  Link Layer
3.1 Introduction
3.2 Ethernet and the IEEE  LAN/MAN Standards
3.2.1 The IEEE  LAN/MAN Standards
3.2.2 The Ethernet Frame Format
3.2.3 .1p/q: Virtual LANs and QoS Tagging
3.2.4 .1AX: Link Aggregation (Formerly .3ad)
3.3 Full Duplex, Power Save, Autonegotiation, and .1X Flow Control
3.3.1 Duplex Mismatch
3.3.2 Wake-on LAN (WoL), Power Saving, and Magic Packets
3.3.3 Link-Layer Flow Control
3.4 Bridges and Switches
3.4.1 Spanning Tree Protocol (STP)
3.4.2 .1ak: Multiple Registration Protocol (MRP)
3.5 Wireless LANs—IEEE .11(Wi-Fi)
3.5.1 .11 Frames
3.5.2 Power Save Mode and the Time Sync Function (TSF)
3.5.3 .11 Media Access Control
3.5.4 Physical-Layer Details: Rates, Channels, and Frequencies
3.5.5 Wi-Fi Security
3.5.6 Wi-Fi Mesh (802.11s)
3.6 Point-to-Point Protocol (PPP)
3.6.1 Link Control Protocol (LCP)
3.6.2 Multi link PPP (MP)
3.6.3 Compression Control Protocol (CCP)
3.6.4 PPP Authentication
3.6.5 Network Control Protocols (NCPs)
3.6.6 Header Compression
3.6.7 Example
3.7 Loopback
3.8 MTU and Path MTU
3.9 Tunneling Basics
3.9.1 Unidirectional Links
x viii Contents
3.10 Attacks on the Link Layer
3.11 Summary
3.12 References
Chapter  ARP: Address Resolution Protocol
4.1 Introduction
4.2 An Example
4.2.1 Direct Delivery and ARP
4.3 ARP Cache
4.4 ARP Frame Format
4.5 ARP Examples
4.5.1 Normal Example
4.5.2 ARP Request to a Nonexistent Host
4.6 ARP Cache Timeout
4.7 Proxy ARP
4.8 Gratuitous ARP and Address Conflict Detection (ACD)
4.9 The arp Command
4.10 Using ARP to Set an Embedded Device’s IPv4 Address
4.11 Attacks Involving ARP
4.12 Summary
4.13 References
Chapter  The Internet Protocol (IP)
5.1 Introduction
5.2 IPv4 and IPv6 Headers
5.2.1 IP Header Fields
5.2.2 The Internet Checksum
5.2.3 DS Field and ECN (Formerly Called the ToS Byte or IPv6 Traffic Class)
5.2.4 IP Options
5.3 IPv6 Extension Headers
5.3.1 IPv6 Options
5.3.2 Routing Header
5.3.3 Fragment Header
5.4 IP Forwarding
5.4.1 Forwarding Table
5.4.2 IP Forwarding Actions
Contents xix
5.4.3 Examples
5.4.4 Discussion
5.5 Mobile IP
5.5.1 The Basic Model: Bidirectional Tunneling
5.5.2 Route Optimization (RO)
5.5.3 Discussion
5.6 Host Processing of IP Datagrams
5.6.1 Host Models
5.6.2 Address Selection
5.7 Attacks Involving IP
5.8 Summary
5.9 References
Chapter  System Configuration: DHCP and Autoconfiguration
6.1 Introduction
6.2 Dynamic Host Configuration Protocol (DHCP)
6.2.1 Address Pools and Leases
6.2.2 DHCP and BOOTP Message Format
6.2.3 DHCP and BOOTP Options
6.2.4 DHCP Protocol Operation
6.2.5 DHCPv6
6.2.6 Using DHCP with Relays
6.2.7 DHCP Authentication
6.2.8 Reconfigure Extension
6.2.9 Rapid Commit
6.2.10 Location Information (LCI and LoST)
6.2.11 Mobility and Handoff Information (MoS and ANDSF)
6.2.12 DHCP Snooping
6.3 Stateless Address Autoconfiguration (SLAAC)
6.3.1 Dynamic Configuration of IPv4 Link-Local Addresses
6.3.2 IPv6 SLAAC for Link-Local Addresses
6.4 DHCP and DNS Interaction
6.5 PPP over Ethernet (PPPoE)
6.6 Attacks Involving System Configuration
6.7 Summary
6.8 References
xx Contents
Chapter  Firewalls and Network Address Translation (NAT)
7.1 Introduction
7.2 Firewalls
7.2.1 Packet-Filtering Firewalls
7.2.2 Proxy Firewalls
7.3 Network Address Translation (NAT)
7.3.1 Traditional NAT: Basic NAT and NAPT
7.3.2 Address and Port Translation Behavior
7.3.3 Filtering Behavior
7.3.4 Servers behind NATs
7.3.5 Hairpinning and NAT Loopback
7.3.6 NAT Editors
7.3.7 Service Provider NAT (SPNAT) and Service Provider IPv6
Transition
7.4 NAT Traversal
7.4.1 Pinholes and Hole Punching
7.4.2 UNilateral Self-Address Fixing (UNSAF)
7.4.3 Session Traversal Utilities for NAT (STUN)
7.4.4 Traversal Using Relays around NAT (TURN)
7.4.5 Interactive Connectivity Establishment (ICE)
7.5 Configuring Packet-Filtering Firewalls and NATs
7.5.1 Firewall Rules
7.5.2 NAT Rules
7.5.3 Direct Interaction with NATs and Firewalls: UPnP, NAT-PMP,
and PCP
7.6 NAT for IPv4/IPv6 Coexistence and Transition
7.6.1 Dual-Stack Lite (DS-Lite)
7.6.2 IPv4/IPv6 Translation Using NATs and ALGs
7.7 Attacks Involving Firewalls and NATs
7.8 Summary
7.9 References
Chapter  ICMPv4 and ICMPv6: Internet Control Message Protocol
8.1 Introduction
8.1.1 Encapsulation in IPv4 and IPv6
8.2 ICMP Messages
8.2.1 ICMPv4 Messages
Contents xxi
8.2.2 ICMPv6 Messages
8.2.3 Processing of ICMP Messages
8.3 ICMP Error Messages
8.3.1 Extended ICMP and Multipart Messages
8.3.2 Destination Unreachable (ICMPv4 Type , ICMPv6 Type )
and Packet Too Big (ICMPv6 Type )
8.3.3 Redirect (ICMPv4 Type , ICMPv6 Type )
8.3.4 ICMP Time Exceeded (ICMPv4 Type , ICMPv6 Type )
8.3.5 Parameter Problem (ICMPv4 Type , ICMPv6 Type )
8.4 ICMP Query/Informational Messages
8.4.1 Echo Request/Reply (ping) (ICMPv4 Types /8, ICMPv6 Types
129/128)
8.4.2 Router Discovery: Router Solicitation and Advertisement
(ICMPv4 Types , )
8.4.3 Home Agent Address Discovery Request/Reply (ICMPv6 Types
144/145)
8.4.4 Mobile Prefix Solicitation/Advertisement (ICMPv6 Types /147)
8.4.5 Mobile IPv6 Fast Handover Messages (ICMPv6 Type )
8.4.6 Multicast Listener Query/Report/Done (ICMPv6 Types
130/131/132)
8.4.7 Version  Multicast Listener Discovery (MLDv2) (ICMPv6
Type )
8.4.8 Multicast Router Discovery (MRD) (IGMP Types /49/50,
ICMPv6 Types /152/153)
8.5 Neighbor Discovery in IPv6
8.5.1 ICMPv6 Router Solicitation and Advertisement (ICMPv6 Types
133, )
8.5.2 ICMPv6 Neighbor Solicitation and Advertisement (IMCPv6 Types
135, )
8.5.3 ICMPv6 Inverse Neighbor Discovery Solicitation/Advertisement
(ICMPv6 Types /142)
8.5.4 Neighbor Unreachability Detection (NUD)
8.5.5 Secure Neighbor Discovery (SEND)
8.5.6 ICMPv6 Neighbor Discovery (ND) Options
8.6 Translating ICMPv4 and ICMPv6
8.6.1 Translating ICMPv4 to ICMPv6
8.6.2 Translating ICMPv6 to ICMPv4
8.7 Attacks Involving ICMP
x xii Contents
8.8 Summary
8.9 References
Chapter  Broadcasting and Local Multicasting (IGMP and MLD)
9.1 Introduction
9.2 Broadcasting
9.2.1 Using Broadcast Addresses
9.2.2 Sending Broadcast Datagrams
9.3 Multicasting
9.3.1 Converting IP Multicast Addresses to  MAC/Ethernet Addresses
9.3.2 Examples
9.3.3 Sending Multicast Datagrams
9.3.4 Receiving Multicast Datagrams
9.3.5 Host Address Filtering
9.4 The Internet Group Management Protocol (IGMP) and Multicast Listener
Discovery Protocol (MLD)
9.4.1 IGMP and MLD Processing by Group Members (“Group
Member Part”)
9.4.2 IGMP and MLD Processing by Multicast Routers (“Multicast
Router Part”)
9.4.3 Examples
9.4.4 Lightweight IGMPv3 and MLDv2
9.4.5 IGMP and MLD Robustness
9.4.6 IGMP and MLD Counters and Variables
9.4.7 IGMP and MLD Snooping
9.5 Attacks Involving IGMP and MLD
9.6 Summary
9.7 References
Chapter  User Datagram Protocol (UDP) and IP Fragmentation
10.1 Introduction
10.2 UDP Header
10.3 UDP Checksum
10.4 Examples
10.5 UDP and IPv6
10.5.1 Teredo: Tunneling IPv6 through IPv4 Networks
Contents xxiii
10.6 UDP-Lite
10.7 IP Fragmentation
10.7.1 Example: UDP/IPv4 Fragmentation
10.7.2 Reassembly Timeout
10.8 Path MTU Discovery with UDP
10.8.1 Example
10.9 Interaction between IP Fragmentation and ARP/ND
10.10 Maximum UDP Datagram Size
10.10.1 Implementation Limitations
10.10.2 Datagram Truncation
10.11 UDP Server Design
10.11.1 IP Addresses and UDP Port Numbers
10.11.2 Restricting Local IP Addresses
10.11.3 Using Multiple Addresses
10.11.4 Restricting Foreign IP Address
10.11.5 Using Multiple Servers per Port
10.11.6 Spanning Address Families: IPv4 and IPv6
10.11.7 Lack of Flow and Congestion Control
10.12 Translating UDP/IPv4 and UDP/IPv6 Datagrams
10.13 UDP in the Internet
10.14 Attacks Involving UDP and IP Fragmentation
10.15 Summary
10.16 References
Chapter  Name Resolution and the Domain Name System (DNS)
11.1 Introduction
11.2 The DNS Name Space
11.2.1 DNS Naming Syntax
11.3 Name Servers and Zones
11.4 Caching
11.5 The DNS Protocol
11.5.1 DNS Message Format
11.5.2 The DNS Extension Format (EDNS0)
11.5.3 UDP or TCP
11.5.4 Question (Query) and Zone Section Format
11.5.5 Answer, Authority, and Additional Information Section Formats
11.5.6 Resource Record Types
x xiv Contents
11.5.7 Dynamic Updates (DNS UPDATE)
11.5.8 Zone Transfers and DNS NOTIFY
11.6 Sort Lists, Round-Robin, and Split DNS
11.7 Open DNS Servers and DynDNS
11.8 Transparency and Extensibility
11.9 Translating DNS from IPv4 to IPv6 (DNS64)
11.10 LLMNR and mDNS
11.11 LDAP
11.12 Attacks on the DNS
11.13 Summary
11.14 References
Chapter  TCP: The Transmission Control Protocol (Preliminaries)
12.1 Introduction
12.1.1 ARQ and Retransmission
12.1.2 Windows of Packets and Sliding Windows
12.1.3 Variable Windows: Flow Control and Congestion Control
12.1.4 Setting the Retransmission Timeout
12.2 Introduction to TCP
12.2.1 The TCP Service Model
12.2.2 Reliability in TCP
12.3 TCP Header and Encapsulation
12.4 Summary
12.5 References
Chapter  TCP Connection Management
13.1 Introduction
13.2 TCP Connection Establishment and Termination
13.2.1 TCP Half-Close
13.2.2 Simultaneous Open and Close
13.2.3 Initial Sequence Number (ISN)
13.2.4 Example
13.2.5 Timeout of Connection Establishment
13.2.6 Connections and Translators
13.3 TCP Options
13.3.1 Maximum Segment Size (MSS) Option
Contents xxv
13.3.2 Selective Acknowledgment (SACK) Options
13.3.3 Window Scale (WSCALE or WSOPT) Option
13.3.4 Timestamps Option and Protection against Wrapped
Sequence Numbers (PAWS)
13.3.5 User Timeout (UTO) Option
13.3.6 Authentication Option (TCP-AO)
13.4 Path MTU Discovery with TCP
13.4.1 Example
13.5 TCP State Transitions
13.5.1 TCP State Transition Diagram
13.5.2 TIME_WAIT (2MSL Wait) State
13.5.3 Quiet Time Concept
13.5.4 FIN_WAIT_2 State
13.5.5 Simultaneous Open and Close Transitions
13.6 Reset Segments
13.6.1 Connection Request to Nonexistent Port
13.6.2 Aborting a Connection
13.6.3 Half-Open Connections
13.6.4 TIME-WAIT Assassination (TWA)
13.7 TCP Server Operation
13.7.1 TCP Port Numbers
13.7.2 Restricting Local IP Addresses
13.7.3 Restricting Foreign Endpoints
13.7.4 Incoming Connection Queue
13.8 Attacks Involving TCP Connection Management
13.9 Summary
13.10 References
Chapter  TCP Timeout and Retransmission
14.1 Introduction
14.2 Simple Timeout and Retransmission Example
14.3 Setting the Retransmission Timeout (RTO)
14.3.1 The Classic Method
14.3.2 The Standard Method
14.3.3 The Linux Method
14.3.4 RTT Estimator Behaviors
14.3.5 RTTM Robustness to Loss and Reordering
x xvi Contents
14.4 Timer-Based Retransmission
14.4.1 Example
14.5 Fast Retransmit
14.5.1 Example
14.6 Retransmission with Selective Acknowledgments
14.6.1 SACK Receiver Behavior
14.6.2 SACK Sender Behavior
14.6.3 Example
14.7 Spurious Timeouts and Retransmissions
14.7.1 Duplicate SACK (DSACK) Extension
14.7.2 The Eifel Detection Algorithm
14.7.3 Forward-RTO Recovery (F-RTO)
14.7.4 The Eifel Response Algorithm
14.8 Packet Reordering and Duplication
14.8.1 Reordering
14.8.2 Duplication
14.9 Destination Metrics
14.10 Repacketization
14.11 Attacks Involving TCP Retransmission
14.12 Summary
14.13 References
Chapter  TCP Data Flow and Window Management
15.1 Introduction
15.2 Interactive Communication
15.3 Delayed Acknowledgments
15.4 Nagle Algorithm
15.4.1 Delayed ACK and Nagle Algorithm Interaction
15.4.2 Disabling the Nagle Algorithm
15.5 Flow Control and Window Management
15.5.1 Sliding Windows
15.5.2 Zero Windows and the TCP Persist Timer
15.5.3 Silly Window Syndrome (SWS)
15.5.4 Large Buffers and Auto-Tuning
15.6 Urgent Mechanism
15.6.1 Example
15.7 Attacks Involving Window Management
Contents xxvii
15.8 Summary
15.9 References
Chapter  TCP Congestion Control
16.1 Introduction
16.1.1 Detection of Congestion in TCP
16.1.2 Slowing Down a TCP Sender
16.2 The Classic Algorithms
16.2.1 Slow Start
16.2.2 Congestion Avoidance
16.2.3 Selecting between Slow Start and Congestion Avoidance
16.2.4 Tahoe, Reno, and Fast Recovery
16.2.5 Standard TCP
16.3 Evolution of the Standard Algorithms
16.3.1 NewReno
16.3.2 TCP Congestion Control with SACK
16.3.3 Forward Acknowledgment (FACK) and Rate Halving
16.3.4 Limited Transmit
16.3.5 Congestion Window Validation (CWV)
16.4 Handling Spurious RTOs—the Eifel Response Algorithm
16.5 An Extended Example
16.5.1 Slow Start Behavior
16.5.2 Sender Pause and Local Congestion (Event )
16.5.3 Stretch ACKs and Recovery from Local Congestion
16.5.4 Fast Retransmission and SACK Recovery (Event )
16.5.5 Additional Local Congestion and Fast Retransmit Events
16.5.6 Timeouts, Retransmissions, and Undoing cwnd Changes
16.5.7 Connection Completion
16.6 Sharing Congestion State
16.7 TCP Friendliness
16.8 TCP in High-Speed Environments
16.8.1 HighSpeed TCP (HSTCP) and Limited Slow Start
16.8.2 Binary Increase Congestion Control (BIC and CUBIC)
16.9 Delay-Based Congestion Control
16.9.1 Vegas
16.9.2 FAST
x xviii Contents
16.9.3 TCP Westwood and Westwood+
16.9.4 Compound TCP
16.10 Buffer Bloat
16.11 Active Queue Management and ECN
16.12 Attacks Involving TCP Congestion Control
16.13 Summary
16.14 References
Chapter  TCP Keepalive
17.1 Introduction
17.2 Description
17.2.1 Keepalive Examples
17.3 Attacks Involving TCP Keepalives
17.4 Summary
17.5 References
Chapter  Security: EAP, IPsec, TLS, DNSSEC, and DKIM
18.1 Introduction
18.2 Basic Principles of Information Security
18.3 Threats to Network Communication
18.4 Basic Cryptography and Security Mechanisms
18.4.1 Cryptosystems
18.4.2 Rivest, Shamir, and Adleman (RSA) Public Key Cryptography
18.4.3 Diffie-Hellman-Merkle Key Agreement (aka Diffie-Hellman or DH)
18.4.4 Signcryption and Elliptic Curve Cryptography (ECC)
18.4.5 Key Derivation and Perfect Forward Secrecy (PFS)
18.4.6 Pseudorandom Numbers, Generators, and Function Families
18.4.7 Nonces and Salt
18.4.8 Cryptographic Hash Functions and Message Digests
18.4.9 Message Authentication Codes (MACs, HMAC, CMAC, and GMAC)
18.4.10 Cryptographic Suites and Cipher Suites
18.5 Certificates, Certificate Authorities (CAs), and PKIs
18.5.1 Public Key Certificates, Certificate Authorities, and X.509
18.5.2 Validating and Revoking Certificates
18.5.3 Attribute Certificates
Contents xxix
18.6 TCP/IP Security Protocols and Layering
18.7 Network Access Control: .1X, .1AE, EAP, and PANA
18.7.1 EAP Methods and Key Derivation
18.7.2 The EAP Re-authentication Protocol (ERP)
18.7.3 Protocol for Carrying Authentication for Network Access (PANA)
18.8 Layer  IP Security (IPsec)
18.8.1 Internet Key Exchange (IKEv2) Protocol
18.8.2 Authentication Header (AH)
18.8.3 Encapsulating Security Payload (ESP)
18.8.4 Multicast
18.8.5 L2TP/IPsec
18.8.6 IPsec NAT Traversal
18.8.7 Example
18.9 Transport Layer Security (TLS and DTLS)
18.9.1 TLS .2
18.9.2 TLS with Datagrams (DTLS)
18.10 DNS Security (DNSSEC)
18.10.1 DNSSEC Resource Records
18.10.2 DNSSEC Operation
18.10.3 Transaction Authentication (TSIG, TKEY, and SIG(0))
18.10.4 DNSSEC with DNS64
18.11 DomainKeys Identified Mail (DKIM)
18.11.1 DKIM Signatures
18.11.2 Example
18.12 Attacks on Security Protocols
18.13 Summary
18.14 References
Glossary of Acronyms
Index