- •For Web Developers
- •Contents at a Glance
- •Table of Contents
- •List of Figures
- •List of Tables
- •Foreword
- •Why Does Microsoft Care About IPv6?
- •Preface
- •Acknowledgments
- •Introduction
- •Who Should Read This Book
- •What You Should Know Before Reading This Book
- •Organization of This Book
- •Appendices of This Book
- •About the Companion CD-ROM
- •System Requirements
- •IPv6 Protocol and Windows Product Versions
- •A Special Note to Teachers and Instructors
- •Disclaimers and Support
- •Technical Support
- •Limitations of IPv4
- •Consequences of the Limited IPv4 Address Space
- •Features of IPv6
- •New Header Format
- •Large Address Space
- •Stateless and Stateful Address Configuration
- •IPsec Header Support Required
- •Better Support for Prioritized Delivery
- •New Protocol for Neighboring Node Interaction
- •Extensibility
- •Comparison of IPv4 and IPv6
- •IPv6 Terminology
- •The Case for IPv6 Deployment
- •IPv6 Solves the Address Depletion Problem
- •IPv6 Solves the Disjoint Address Space Problem
- •IPv6 Solves the International Address Allocation Problem
- •IPv6 Restores End-to-End Communication
- •IPv6 Uses Scoped Addresses and Address Selection
- •IPv6 Has More Efficient Forwarding
- •IPv6 Has Support for Security and Mobility
- •Testing for Understanding
- •Architecture of the IPv6 Protocol for Windows Server 2008 and Windows Vista
- •Features of the IPv6 Protocol for Windows Server 2008 and Windows Vista
- •Installed, Enabled, and Preferred by Default
- •Basic IPv6 Stack Support
- •IPv6 Stack Enhancements
- •GUI and Command-Line Configuration
- •Integrated IPsec Support
- •Windows Firewall Support
- •Temporary Addresses
- •Random Interface IDs
- •DNS Support
- •Source and Destination Address Selection
- •Support for ipv6-literal.net Names
- •LLMNR
- •PNRP
- •Literal IPv6 Addresses in URLs
- •Static Routing
- •IPv6 over PPP
- •DHCPv6
- •ISATAP
- •Teredo
- •PortProxy
- •Application Support
- •Application Programming Interfaces
- •Windows Sockets
- •Winsock Kernel
- •Remote Procedure Call
- •IP Helper
- •Win32 Internet Extensions
- •Windows Filtering Platform
- •Manually Configuring the IPv6 Protocol
- •Configuring IPv6 Through the Properties of Internet Protocol Version 6 (TCP/IPv6)
- •Configuring IPv6 with the Netsh.exe Tool
- •Disabling IPv6
- •IPv6-Enabled Tools
- •Ipconfig
- •Route
- •Ping
- •Tracert
- •Pathping
- •Netstat
- •Displaying IPv6 Configuration with Netsh
- •Netsh interface ipv6 show interface
- •Netsh interface ipv6 show address
- •Netsh interface ipv6 show route
- •Netsh interface ipv6 show neighbors
- •Netsh interface ipv6 show destinationcache
- •References
- •Testing for Understanding
- •The IPv6 Address Space
- •IPv6 Address Syntax
- •Compressing Zeros
- •IPv6 Prefixes
- •Types of IPv6 Addresses
- •Unicast IPv6 Addresses
- •Global Unicast Addresses
- •Topologies Within Global Addresses
- •Local-Use Unicast Addresses
- •Unique Local Addresses
- •Special IPv6 Addresses
- •Transition Addresses
- •Multicast IPv6 Addresses
- •Solicited-Node Address
- •Mapping IPv6 Multicast Addresses to Ethernet Addresses
- •Anycast IPv6 Addresses
- •Subnet-Router Anycast Address
- •IPv6 Addresses for a Host
- •IPv6 Addresses for a Router
- •Subnetting the IPv6 Address Space
- •Step 1: Determining the Number of Subnetting Bits
- •Step 2: Enumerating Subnetted Address Prefixes
- •IPv6 Interface Identifiers
- •EUI-64 Address-Based Interface Identifiers
- •Temporary Address Interface Identifiers
- •IPv4 Addresses and IPv6 Equivalents
- •References
- •Testing for Understanding
- •Structure of an IPv6 Packet
- •IPv4 Header
- •IPv6 Header
- •Values of the Next Header Field
- •Comparing the IPv4 and IPv6 Headers
- •IPv6 Extension Headers
- •Extension Headers Order
- •Hop-by-Hop Options Header
- •Destination Options Header
- •Routing Header
- •Fragment Header
- •Authentication Header
- •Encapsulating Security Payload Header and Trailer
- •Upper-Layer Checksums
- •References
- •Testing for Understanding
- •ICMPv6 Overview
- •Types of ICMPv6 Messages
- •ICMPv6 Header
- •ICMPv6 Error Messages
- •Destination Unreachable
- •Packet Too Big
- •Time Exceeded
- •Parameter Problem
- •ICMPv6 Informational Messages
- •Echo Request
- •Echo Reply
- •Comparing ICMPv4 and ICMPv6 Messages
- •Path MTU Discovery
- •Changes in PMTU
- •References
- •Testing for Understanding
- •Neighbor Discovery Overview
- •Neighbor Discovery Message Format
- •Neighbor Discovery Options
- •Source and Target Link-Layer Address Options
- •Prefix Information Option
- •Redirected Header Option
- •MTU Option
- •Route Information Option
- •Neighbor Discovery Messages
- •Router Solicitation
- •Router Advertisement
- •Neighbor Solicitation
- •Neighbor Advertisement
- •Redirect
- •Summary of Neighbor Discovery Messages and Options
- •Neighbor Discovery Processes
- •Conceptual Host Data Structures
- •Address Resolution
- •Neighbor Unreachability Detection
- •Duplicate Address Detection
- •Router Discovery
- •Redirect Function
- •Host Sending Algorithm
- •References
- •Testing for Understanding
- •MLD and MLDv2 Overview
- •IPv6 Multicast Overview
- •Host Support for Multicast
- •Router Support for Multicast
- •MLD Packet Structure
- •MLD Messages
- •Multicast Listener Query
- •Multicast Listener Report
- •Multicast Listener Done
- •Summary of MLD
- •MLDv2 Packet Structure
- •MLDv2 Messages
- •The Modified Multicast Listener Query
- •MLDv2 Multicast Listener Report
- •Summary of MLDv2
- •MLD and MLDv2 Support in Windows Server 2008 and Windows Vista
- •References
- •Testing for Understanding
- •Address Autoconfiguration Overview
- •Types of Autoconfiguration
- •Autoconfigured Address States
- •Autoconfiguration Process
- •DHCPv6
- •DHCPv6 Messages
- •DHCPv6 Stateful Message Exchange
- •DHCPv6 Stateless Message Exchange
- •DHCPv6 Support in Windows
- •IPv6 Protocol for Windows Server 2008 and Windows Vista Autoconfiguration Specifics
- •Autoconfigured Addresses for the IPv6 Protocol for Windows Server 2008 and Windows Vista
- •References
- •Testing for Understanding
- •Name Resolution for IPv6
- •DNS Enhancements for IPv6
- •LLMNR
- •Source and Destination Address Selection
- •Source Address Selection Algorithm
- •Destination Address Selection Algorithm
- •Example of Using Address Selection
- •Hosts File
- •DNS Resolver
- •DNS Server Service
- •DNS Dynamic Update
- •Source and Destination Address Selection
- •LLMNR Support
- •Support for ipv6-literal.net Names
- •Peer Name Resolution Protocol
- •References
- •Testing for Understanding
- •Routing in IPv6
- •IPv6 Routing Table Entry Types
- •Route Determination Process
- •Strong and Weak Host Behaviors
- •Example IPv6 Routing Table for Windows Server 2008 and Windows Vista
- •End-to-End IPv6 Delivery Process
- •IPv6 on the Sending Host
- •IPv6 on the Router
- •IPv6 on the Destination Host
- •IPv6 Routing Protocols
- •Overview of Dynamic Routing
- •Routing Protocol Technologies
- •Routing Protocols for IPv6
- •Static Routing with the IPv6 Protocol for Windows Server 2008 and Windows Vista
- •Configuring Static Routing with Netsh
- •Configuring Static Routing with Routing and Remote Access
- •Dead Gateway Detection
- •References
- •Testing for Understanding
- •Overview
- •Node Types
- •IPv6 Transition Addresses
- •Transition Mechanisms
- •Using Both IPv4 and IPv6
- •IPv6-over-IPv4 Tunneling
- •DNS Infrastructure
- •Tunneling Configurations
- •Router-to-Router
- •Host-to-Router and Router-to-Host
- •Host-to-Host
- •Types of Tunnels
- •PortProxy
- •References
- •Testing for Understanding
- •ISATAP Overview
- •ISATAP Tunneling
- •ISATAP Tunneling Example
- •ISATAP Components
- •Router Discovery for ISATAP Hosts
- •Resolving the Name “ISATAP”
- •Using the netsh interface isatap set router Command
- •ISATAP Addressing Example
- •ISATAP Routing
- •ISATAP Communication Examples
- •ISATAP Host to ISATAP Host
- •ISATAP Host to IPv6 Host
- •Configuring an ISATAP Router
- •References
- •Testing for Understanding
- •6to4 Overview
- •6to4 Tunneling
- •6to4 Tunneling Example
- •6to4 Components
- •6to4 Addressing Example
- •6to4 Routing
- •6to4 Support in Windows Server 2008 and Windows Vista
- •6to4 Host/Router Support
- •6to4 Router Support
- •6to4 Communication Examples
- •6to4 Host to 6to4 Host/Router
- •6to4 Host to IPv6 Host
- •Example of Using ISATAP and 6to4 Together
- •Part 1: From ISATAP Host A to 6to4 Router A
- •Part 2: From 6to4 Router A to 6to4 Router B
- •Part 3: From 6to4 Router B to ISATAP Host B
- •References
- •Testing for Understanding
- •Introduction to Teredo
- •Benefits of Using Teredo
- •Teredo Support in Microsoft Windows
- •Teredo and Protection from Unsolicited Incoming IPv6 Traffic
- •Network Address Translators (NATs)
- •Teredo Components
- •Teredo Client
- •Teredo Server
- •Teredo Relay
- •Teredo Host-Specific Relay
- •The Teredo Client and Host-Specific Relay in Windows
- •Teredo Addresses
- •Teredo Packet Formats
- •Teredo Data Packet Format
- •Teredo Bubble Packets
- •Teredo Indicators
- •Teredo Routing
- •Routing for the Teredo Client in Windows
- •Teredo Processes
- •Initial Configuration for Teredo Clients
- •Maintaining the NAT Mapping
- •Initial Communication Between Teredo Clients on the Same Link
- •Initial Communication Between Teredo Clients in Different Sites
- •Initial Communication from a Teredo Client to a Teredo Host-Specific Relay
- •Initial Communication from a Teredo Host-Specific Relay to a Teredo Client
- •Initial Communication from a Teredo Client to an IPv6-Only Host
- •Initial Communication from an IPv6-Only Host to a Teredo Client
- •References
- •Testing for Understanding
- •IPv6 Security Considerations
- •Authorization for Automatically Assigned Addresses and Configurations
- •Recommendations
- •Protection of IPv6 Packets
- •Recommendations
- •Host Protection from Scanning and Attacks
- •Address Scanning
- •Port Scanning
- •Recommendations
- •Control of What Traffic Is Exchanged with the Internet
- •Recommendations
- •Summary
- •References
- •Testing for Understanding
- •Introduction
- •Planning for IPv6 Deployment
- •Platform Support for IPv6
- •Application Support for IPv6
- •Unicast IPv6 Addressing
- •Tunnel-Based IPv6 Connectivity
- •Native IPv6 Connectivity
- •Name Resolution with DNS
- •DHCPv6
- •Host-Based Security and IPv6 Traffic
- •Prioritized Delivery for IPv6 Traffic
- •Deploying IPv6
- •Set Up an IPv6 Test Network
- •Begin Application Migration
- •Configure DNS Infrastructure to Support AAAA Records and Dynamic Updates
- •Deploy a Tunneled IPv6 Infrastructure with ISATAP
- •Upgrade IPv4-Only Hosts to IPv6/IPv4 Hosts
- •Begin Deploying a Native IPv6 Infrastructure
- •Connect Portions of Your Intranet over the IPv4 Internet
- •Connect Portions of Your Intranet over the IPv6 Internet
- •Summary
- •References
- •Testing for Understanding
- •Basic Structure of IPv6 Packets
- •LAN Media
- •Ethernet: Ethernet II
- •Ethernet: IEEE 802.3 SNAP
- •Token Ring: IEEE 802.5 SNAP
- •FDDI
- •IEEE 802.11
- •WAN Media
- •Frame Relay
- •ATM: Null Encapsulation
- •ATM: SNAP Encapsulation
- •IPv6 over IPv4
- •References
- •Added Constants
- •Address Data Structures
- •in6_addr
- •sockaddr_in6
- •sockaddr_storage
- •Wildcard Addresses
- •in6addr_loopback and IN6ADDR_LOOPBACK_INIT
- •Core Sockets Functions
- •Name-to-Address Translation
- •Address-to-Name Translation
- •Using getaddrinfo
- •Address Conversion Functions
- •Socket Options
- •New Macros
- •References
- •General
- •Addressing
- •Applications
- •Sockets API
- •Transport Layer
- •Internet Layer
- •Network Layer Security
- •Link Layer
- •Routing
- •IPv6 Transition Technologies
- •Chapter 1: Introduction to IPv6
- •Chapter 2: IPv6 Protocol for Windows Server 2008 and Windows Vista
- •Chapter 3: IPv6 Addressing
- •Chapter 4: The IPv6 Header
- •Chapter 5: ICMPv6
- •Chapter 6: Neighbor Discovery
- •Chapter 8: Address Autoconfiguration
- •Chapter 9: IPv6 and Name Resolution
- •Chapter 10: IPv6 Routing
- •Chapter 11: IPv6 Transition Technologies
- •Chapter 12: ISATAP
- •Chapter 13: 6to4
- •Chapter 14: Teredo
- •Chapter 15: IPv6 Security Considerations
- •Chapter 16: Deploying IPv6
- •IPv6 Test Lab Setup
- •CLIENT1
- •ROUTER1
- •ROUTER2
- •CLIENT2
- •IPv6 Test Lab Tasks
- •Performing Link-Local Pings
- •Enabling Native IPv6 Connectivity on Subnet 1
- •Configuring ISATAP
- •Configuring Native IPv6 Connectivity for All Subnets
- •Using Name Resolution
- •Configuring an IPv6-Only Routing Infrastructure
- •Overview
- •Mobile IPv6 Components
- •Mobile IPv6 Transport Layer Transparency
- •Mobile IPv6 Messages and Options
- •Mobility Header and Messages
- •Type 2 Routing Header
- •Home Address Option for the Destination Options Header
- •ICMPv6 Messages for Mobile IPv6
- •Modifications to Neighbor Discovery Messages and Options
- •Mobile IPv6 Data Structures
- •Binding Cache
- •Binding Update List
- •Home Agents List
- •Correspondent Registration
- •Return Routability Procedure
- •Detecting Correspondent Nodes That Are Not Mobile IPv6–Capable
- •Mobile IPv6 Message Exchanges
- •Data Between a Mobile Node and a Correspondent Node
- •Binding Maintenance
- •Home Agent Discovery
- •Mobile Prefix Discovery
- •Mobile IPv6 Processes
- •Attaching to the Home Link
- •Moving from the Home Link to a Foreign Link
- •Moving to a New Foreign Link
- •Returning Home
- •Mobile IPv6 Host Sending Algorithm
- •Mobile IPv6 Host Receiving Algorithm
- •References
- •Glossary
- •Index
- •About the Author
- •System Requirements
Appendix B Windows Sockets Changes for IPv6 |
407 |
Using getaddrinfo
Here is an example of a client application using getaddrinfo() to connect to a specific server:
{/* Client Side...*/}
if (getaddrinfo(service_name, port, NULL, &ai) != 0) {/* Error Handling */}
conn_socket = socket(ai->ai_family, ai->ai_socktype,ai->ai_protocol); if (conn_socket <0 ) {/* Error Handling */}
if (connect(conn_socket,ai->ai_addr,ai->ai_addrlen) == SOCKET_ERROR) {/* Error Handling */}
freeaddrinfo(ai);
Here is an example of the corresponding server application using getaddrinfo() to resolve the address information for the socket creation and bind calls:
{/* Server Side... */} hints.ai_family = AF_INET6; hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_NUMERICHOST | AI_PASSIVE;
retval = getaddrinfo(interface, port, &hints, &ai); if (retval != 0) {/* Error Handling */}
listen_socket = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); if (listen_socket == INVALID_SOCKET){/* Error Handling */}
if (bind(listen_socket,ai->ai_addr,ai->ai_addrlen )== SOCKET_ERROR) {/* Error Handling */}
freeaddrinfo(ai);
The interface parameter in this call could be NULL, or it could be set to a numeric string.
Address Conversion Functions
The inet_addr() and inet_ntoa() functions are provided to convert IPv4 addresses between binary and text formats. The Internet Engineering Task Force (IETF) defined similar functions— inet_pton() and inet_ntop()—to convert both IPv4 and IPv6 addresses. These functions contain an additional address family argument to make them protocol-independent.
Because getaddrinfo() and getnameinfo() provide the same functionality, Windows Server 2008 and Windows Vista do not support the inet_pton() and inet_ntop() functions.
Socket Options
A new socket option level, IPPROTO_IPV6, has been defined for IPv6-specific socket options. Although an application can send multicast UDP packets by specifying a multicast address in
408 Understanding IPv6, Second Edition
sendto(), most of the new socket options currently defined for IPv6 are intended to adjust multicast behavior. New socket options are the following:
■IPV6_MULTICAST_IF This option sets the default interface to use for outgoing multicast traffic to the interface indicated by the index specified in the argument. (A 0 indicates that the system chooses the interface.)
■IPV6_MULTICAST_HOPS This option sets the hop limit for outgoing multicast packets based on the argument. Valid values are either 0 to 255 inclusive or –1 (to use the system default).
■IPV6_MULTICAST_LOOP This option controls whether outgoing multicast packets addressed to a group, of which the interface is a member, is looped back.
For reception of multicast traffic, new options are defined to join and leave multicast groups. These options take an argument of an ipv6_mreq structure:
struct ipv6_mreq {
struct in6_addr ipv6mr_multiaddr; unsigned int ipv6mr_interface;
};
This structure contains the multicast address of the group to be joined or left, and an interface index to use for this join or leave.
Following is a list of new multicast socket options:
■IPV6_JOIN_GROUP This option is used to join the specified multicast group on the interface indicated. (A 0 indicates that the system chooses the interface.)
■IPV6_LEAVE_GROUP The IPV6_LEAVE_GROUP option is used to leave the specified group on the interface indicated.
In addition, another socket option, IPV6_UNICAST_HOPS, is defined to control the hop limit for outgoing unicast packets.
New Macros
The additions to Windows Sockets that support IPv6 include the following set of macros to test addresses and determine whether they are special IPv6 addresses:
■IN6_IS_ADDR_UNSPECIFIED
■IN6_IS_ADDR_LOOPBACK
■IN6_IS_ADDR_MULTICAST
■IN6_IS_ADDR_LINKLOCAL
■IN6_IS_ADDR_SITELOCAL
Appendix B Windows Sockets Changes for IPv6 |
409 |
■IN6_IS_ADDR_V4MAPPED
■IN6_IS_ADDR_V4COMPAT
■IN6_IS_ADDR_MC_NODELOCAL
■IN6_IS_ADDR_MC_LINKLOCAL
■IN6_IS_ADDR_MC_SITELOCAL
■IN6_IS_ADDR_MC_ORGLOCAL
■IN6_IS_ADDR_MC_GLOBAL
The first seven macros in the preceding list return a true value if the address is of the specified type. The last five test the scope of a multicast address, returning a true value if the address is a multicast address of the specified scope and returning a false value if the address is either not a multicast address or is not of the specified scope.
The IN6_IS_ADDR_V4MAPPED macro can be used to determine whether the destination address for a socket is an IPv4 node.
References
The following references were cited in this chapter:
■RFC 3493 — “Basic Socket Interface Extensions for IPv6”
■RFC 3542 — “Advanced Sockets Application Program Interface (API) for IPv6”
You can obtain these RFCs from the \RFCs_and_Drafts folder on the companion CD-ROM or from http://www.ietf.org/rfc.html.