文档介绍：IPv6 Deployment
Scott IE #5133, CISSP, FCNE, CIPTSS
Rocky Mountain Cisco User’s Group December, 2003
Agenda
Motivation for IPv6
IPv6 Protocol Specifics
IPv6 Header and IPv6 Addressing
ICMPv6
QoS, Security
DNS for IPv6
IPv6 Routing Protocols
IPv6 Transition Mechanisms
IPv6 6Bone and Research Projects
Vendor Support for IPv6 – Configuration Examples
Cisco, Microsoft, Sun, Linux
Live IPv6 Technology Demonstration
Questions and Answers
References and Resources
2
IPv4 Deficiencies
Address Space Limitations
Inadequate address aggregation mechanisms
Ballooning BGP databases
Router memory exhaustion
Increased forwarding table look up time
NAT is not an optimal solution – lack of peer-to-peer model
Broadcast is inefficient
Uncontrolled packet fragmentation
No inherent security
Inadequate support for mobility
3
IPv4 Address Growth
Percentage IPv4 Addresses Allocated
Source of graph:
Tony Hain – Technical Leader - Cisco Systems
North America Global IPv6 Summit 2003 presentation , Technology Director - IPv6 Forum Technical Directorate
4
IPng
Jan 92
Jul 92
Jan 93
Jan 94
Jul 94
Jul 93
IPv7
(Ullman)
TP/IX
CATNIP
TUBA
(Callon)
ENCAPS
(Hinden)
IPAE
SIP
(Deering)
PIP
(Francis)
SIPP
5
IPv6 Features
Expanded addressing capability
Efficient and hierarchical addressing and routing
Auto-configuration mechanisms
Simplification of header format
Improved support for extensions and options
Extensions for authentication and privacy
Flow label capability
Mobility
Extensibility – future proof
Flexible transition mechanisms
6
128 bit Source Address
128 bit Destination Address
31
Version
Class
Flow Label
Payload Length
Next Header
Hop Limit
4
12
24
16
bit
0
bit
0
31
Version
IHL
Total Length
Identifier
Flags
Fragment Offset
32 bit Source Address
32 bit Destination Address
8
24
16
Service Type
Options and Padding
Time to Live
Header Checksum
Protocol
IPv4 Header 20 octets, 12 fields, including 3 flag bits
+ fixed max number of opti