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IPv6 and Packet
Tracer
Jim Bergquist [email protected]
Lakes Country Service Cooperative
Karen Alderson [email protected]
Networking Academy Technical Advocacy
IPv6 & Packet Tracer
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Purpose of This Session
To provide a working knowledge to instructors and
students for building and troubleshooting simple IPv6
networks
Scope of this session
 Topics sufficient to give students and instructors a basic
knowledge of how IPv6 works
 Demos, with Packet Tracer files and lab activities
 Links to resources that cover more IPv6 topics
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Visualizing the
IPv6 Address
Space
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Visualizing the IPv6 Address Space
128 bit addresses
2 128 is a very large number
 Assign one IPv6 address
per grain of sand
Fill here
 How many grains of
sand would be needed to
use all IPv6 addresses?
 Fill Earth-sized
containers with the sand
Sand
Grain 
Hollow
Earth-sized
container
IPv6 address
2009:1:3:4EFF:2C:16BA:3D:B012/112
Earth drawing credit: http://flickr.com/photos/ontdesign/
http://search.creativecommons.org/
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Visualizing the IPv6 Address Space
The Earth-sized containers would make 20 circles around
the outer orbit of our solar system (Pluto)
Our Solar
System
Blue dots
are Earthsized
containers
Based on image from
public image gallery at
http://www.eso.org/
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IPv6 Address
Format and Types
of Addresses
More information is available in the referenced resources
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What IPv6 Addresses Look Like
 128 bits are separated into eight blocks of 16 bits
 Each 16-bit block is represented in hex and delimited
with colons:
2001:00D3:0000:2F00:02AA:00FF:FE28:9C5A
 In each 16-bit block, leading zeros may be removed:
2001:00D3:0000:2F00:02AA:00FF:FE28:9C5A
2001:D3:0:2F00:2AA:FF:FE28:9C5A
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Zero Compression (or Shortform)
 Consecutive 16-bit blocks of zeroes can be replaced
with a double-colon (::)
 FE80:0:0:0:2AA:FF:FE9A:4CA2 can be compressed to
FE80::2AA:FF:FE9A:4CA2
 The multicast address FF02:0:0:0:0:0:0:2 can be
compressed to FF02::2
 Zero compression can only be used once in a given
address
 Otherwise, you could not determine the number of 0
bits represented by each double-colon instance
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Teaching Tip
If students have trouble seeing why only one double
colon is allowed, give them an example of what would
happen if you allowed it. The following two addresses
could both be shortened to the third address, so there
would be ambiguity
2001:0:0:0:355:0:0:7
2001:0:0:355:0:0:0:7
2001::355::7
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NOT ALLOWED
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IPv6 Address Prefix Length
 An address prefix is indicated by the prefix length
following a “/” at the end of the address.
 Example:
2001:DB8:0:2F00:2AA:FF:FE28:9C5A/64
 The prefix length (number of upper bits) is 64
 This means the lower 64 bits are used for hosts
 It is used the same way as CIDR in IPv4
 Subnet masks are not used in IPv6
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Teaching Tips
Why emphasize hexadecimal and hex-to-binary conversion?

To remove the mystery from numbers like B and D3A

To see why 32 hex digits represents 128 binary bits

To understand where the network and host portion are,
using a classless designation, “/”

To understand how stateless autoconfiguration is done
Fortunately, hex-to-binary conversion is easy
Consider having students memorize the binary equivalent
of the 16 hex digits
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Fun Teaching Facts
 The Internet Assigned Numbers Authority (IANA) will
allocate from 2001::/16 for the time being
http://www.zytrax.com/tech/protocols/ipv6.html#global
 Addresses within 2001:db8::/32 are non-routable and
should be used in examples given in documentation for
networking scenarios or tutorials
http://en.wikipedia.org/wiki/IPv6
 Windows 7 Server, when it is released, will have
powerful VPN capabilities. IPv6 needs to be deployed
http://www.computerworld.com/action/article.do?command=view
ArticleBasic&articleId=9118322
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Types of IPv6 Addresses
Unicast addresses will be used in this session
See additional resources for other definitions
 Unicast (one to one)
 Multicast (one to many)
 Anycast (one to “nearest,” according to a metric)
 No broadcasts in IPv6
See a description of address types
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Unicast IPv6 Addresses
Differentiated by their scope, as follows:
 Link-local addresses—only on single link, not routed
FE80 prefix
 Unique-local addresses—routed only within private
network
FC00 prefix
 Global unicast addresses—globally routable
2001 prefix currently being issued
Global addresses use a 64 bit host portion
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IPv6 Address
Assignment
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IPv6 Address Assignment
Addresses can be assigned in these ways
 Manually (static)
 Stateless auto-configuration
 IPv6 dhcp (Stateful autoconfiguration)
 Link-local addresses are configured automatically
No arp in IPv6. It is replaced by Neighbor Discovery (ND)
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IPv6 Stateless Autoconfiguration
1. Host automatically configures its own link-local
address
2. With link-local address, a host discovers
connected routers to obtain a global prefix
3. A host then builds its own global unicast address
See the provided Activity:
Build an IPv6 EUI-64 address.doc
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Stateless Autoconfiguration
DHCPv6 is not required
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Stateless Autoconfiguration
Only the network part of the address is supplied
in the ipv6 address command
Router(config)#ipv6 unicast-routing
Router(config)#int fa0/1
Router(config-if)#ipv6 addr 2001:db8::/64 eui-64
Router(config-if)#ipv6 enable
Router(config-if)#no shut
Because 2001:db8:: ends with “::”, it is not an address.
The rest of the address is supplied by the eui-64 process.
eui stands for “extended unique identifier”
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Stateless Autoconfiguration
Router’s fa0/1 interface generates its link-local
address and global unicast address
Router#sho ipv6 int bri
FastEthernet0/0
[administratively down/down]
FastEthernet0/1
[up/up]
FE80::201:42FF:FE44:3C02
2001:DB8::201:42FF:FE44:3C02
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Stateless Autoconfiguration
Packet Tracer PCs support this
On PC’s Config tab, go to Global Settings and select
Auto Config button to acquire Gateway address.
Note: It is the link-local address of the router’s fa0/1
(It begins with FE80)
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Stateless Autoconfiguration
Packet Tracer PC
Select FastEthernet to check if it is set to Auto Config, and
has its link-local address and an EUI address.
Packet Tracer PC line command to obtain both interface
and default gateway addresses:
PC> ipv6config autoconfig
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Commands for Students to Compare
show ip interface brief
show ip route
show ip protocols
show ipv6 interface brief
show ipv6 route
show ipv6 protocols
Differences in RIP and IPv6 RIP (RIPng)
(see example in this presentation)
Differences in OSPF and IPv6 OSPF (OSPFv3)
(see example in this presentation)
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Ping Command for IPv6
 In Cisco routers, it is ping
 In Packet Tracer routers, it is ping
 In Packet Tracer PCs, it is ping
 In Windows XP, it is ping6
Note:
• With PT PCs, if you type an IPv6 address incorrectly, for
example with a semicolon, ping will become unresponsive
• Windows XP will report “Host not found”
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Packet Tracer ipv6config Command
Used in Packet Tracer PCs. Similar to ipconfig
In Windows XP:
C:\ ipv6 install
C:\ ipconfig
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install the protocol stack
display IPv4 and IPv6 addresses
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Demo: IPv6 RIP
(RIPng)
RIPng (“Next Generation”) is a name used to describe IPv6 RIP
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Connectivity Using IPv6 RIP
Static addresses are used between routers.
Stateless autoconfiguration is used for hosts.
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Global Commands
Configure IPv6 RIP on each router
ipv6 unicast-routing
(enable IPv6)
ipv6 router rip CIRCUS
(define a process called CIRCUS)
Note: The global command
ipv6 router rip CIRCUS
will be automatically configured by the router when
IPv6 RIP is configured on an interface (next slide)
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Interface Commands- Static Address
Configure interconnecting interfaces on the two routers
(example, on fa0/0 of Router1)
ipv6 enable
ipv6 addr FC00:2::1/112
ipv6 rip CIRCUS enable
no shut
Note: The IPv4 RIP global network command is not used
with IPv6 RIP
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Interface Commands- Auto Config
Configure the router LAN interfaces and the PCs with Auto
Config (example, on fa0/1 of Router1)
ipv6 enable
ipv6 addr FC00:3::/64 eui-64
ipv6 rip CIRCUS enable
no shut
Note: Ensure that the PCs are set for Auto Config in the
Config Tab
Note: The process name CIRCUS is user-defined and is
local to the router. You can use a different process name
on a neighboring router
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Ping from PC1 to PC0
Note: The colon, “:” following the address is merely part
of the ping output
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Demo or Lab:
IPv6 OSPF
(OSPFv3)
Packet Tracer files and labs are included with the conference
materials
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Configuring OSPF for IPv6
Based on CCNP- BSI Lab 8-1
Ping
Here
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Enable IPv6 Routing
A global command
R2(config)#ipv6 unicast-routing
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Configure Loopback Addresses
Needed for OSPFv3
R1(config)# interface loopback0
R1(config-if)# ip address 10.1.1.1
255.255.255.0
R1(config-if)# ipv6 address FC00::1:1/112
Note: Both IPv4 and IPv6 addresses are needed on the
Loopback interfaces
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Configure Serial Addresses
Use static addressing
R1(config)# interface serial0/0/0
R1(config-if)# ipv6 address FC00::12:1/112
R1(config-if)# clockrate 64000
R1(config-if)# no shutdown
Note: The ipv6 enable command is unnecessary if
you configure an address on an interface
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Configure EUI addresses
Configure the router FastEthernet interfaces
R2(config)# interface fastethernet0/0
R2(config-if)# ipv6 address FC00:23::/64 eui-64
R2(config-if)# no shutdown
Note: Stateless Autoconfiguration works between
two routers or between a router and a host
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Enable OSPFv3
Enable on all interfaces, including Loopback
R2(config)#interface loopback0
R2(config-if)#ipv6 ospf 1 area 0
R2(config-if)#interface serial0/0/0
R2(config-if)#ipv6 ospf 1 area 0
R2(config-if)#interface fastethernet0/0
R2(config-if)#ipv6 ospf 1 area 0
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Verify the Configuration
Use these commands to verify the configuration and to
examine tables
From host PC0
PC>ping FC00::12:1
From router R1
R1#show ipv6 ospf neighbor
R1#show ipv6 route
R1#show ipv6 ospf interface
R1#show ipv6 protocol
R1#show ipv6 ospf database
R1#show run
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ICMPv6 Packet
Type Numbers
You can look at packet details with Packet Tracer
Also see included Activity:
Comparing ICMPv4 and ICMPv6 Packet Type numbers.doc
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Some ICMPv6 Type Numbers
Activity: Use Packet Tracer in Simulation mode
Click a packet to see type number
 Router Advertisement
(Neighbor Discovery)- 134
Specific to IPv6
Sent periodically to neighbors
 v6 Echo Request (ping)- 128
Compare with v4: Type 8
 v6 Echo Reply (ping)- 129
Type 134
Compare with v4: Type 0
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Broken Network
Example
Let’s fix it!
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This Network has a Problem
Uses IPv6 RIP
Static IPv6 addresses between routers
Stateless autoconfiguration for hosts
What IPv6 address is assigned to each PC?
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This Network has a Problem
Problem is in Router1 or Router2
What do you think we should do
first?
A. sho ipv6 protocol on Routers 1 and 2
B. sho ipv6 route on Routers 1 and 2
C. sho ipv6 int brief on Routers 1 and 2
D. ping from PC1 to PC0 in
Simulation mode
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This Network has a Problem
What should we do next?
A. sho run on Routers 1 and 2
B. sho ipv6 route on Routers 1 and 2
C. sho ipv6 int brief on Routers 1 and 2
D. sho ipv6 rip database on Routers 1 and 2
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This Network has a Problem
Which of these is the problem?
A. Missing RIP enable command on an interface
B. Missing IPv6 address on a serial interface
C. ipv6 rip is not enabled globally on a router
D. Clock not set on a serial DCE interface
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Another Broken
Network
Example
Let’s fix this one, too!
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This Network has a Problem
Problem is in Router0 or Router1
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This Network has a Problem
What should we do first?
A. sho ipv6 protocol on Routers 0 and 1
B. sho ipv6 route on Routers 0 and 1
C. sho ipv6 int brief on Routers 0 and 1
D. ping from PC1 to PC0 in Simulation mode
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This Network has a Problem
What should we do next?
A. sho run on Routers 0 and 1
B. sho ipv6 route on Routers 0 and 1
C. sho ipv6 int brief on Routers 0 and 1
D. sho ipv6 rip database on Routers 0 and 1
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This Network has a Problem
Which of these is the problem?
A. Missing ipv6 rip CIRCUS enable command
on an interface
B. Missing IPv6 address on an interface
C. ipv6 rip is not enabled globally on a router
D. Interface is shut down
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Now You Can
Configure a
Network
Use your knowledge to create a working network
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Configure this Network in Packet Tracer
 Routers and hosts need to be configured
 Use the suggested networks, and IPv6 RIP
DCE
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What You Can Do
To Help
Contribute your work
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Share Your Packet Tracer Files and
Activities
 Login to http://cisco.netacad.net >> Instructor Home
Page >> Forums and Chat
 In Instructor Community, click Packet Tracer
 If you have a Packet Tracer file (.pkt), click Discuss
Best Practices
Best Practices for teaching and using PT in the classroom
 If you have a Packet Tracer Activity (.pka), click Activity
Wizard
Author and share activities within your postings
 Add a Discussion, describe your Packet Tracer file or
Activity and attach it
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Communicating
Between IPv4
and IPv6
One example of several technologies
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Communicating Between Protocols
Students will ask “Can you communicate between
IPv4 and IPv6 networks?”
 Dual Stack (dual OSI stack)
“Dual stack where you can; tunnel where you must.” 1
 Tunneling
See CCNP- BSI, Labs 8.2 and 8.3
Note: PT Routers do not have the tunnel command
 Address Translation
Address translation may not become widely used1
1
Scott Hogg , Network World , 09/05/2007
http://www.networkworld.com/news/tech/2007/090507-tech-uodate.html
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Dual Stack Example
 Dual stack means configuring IPv4 and IPv6 on at least
one router interface
 No special router commands needed
Works on any router that supports IPv6
 Main tasks:
Configure IPv4 and/or IPv6 addresses
on appropriate interfaces
Enable RIP and IPv6 RIP routing protocols (or OSPF and OSPFv3)
Note: The routing tables are separate
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Dual Stack
Example
IPv4 host can ping
IPv4 host
IPv6 host can ping
IPv6 host
Dual stack
implemented
here
IPv4 and IPv6 host
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IPv4 Routing Table, Router0
Router0#sho ip route
<output omitted>
Gateway of last resort is not set
C
192.168.0.0/24 is directly
connected, FastEthernet0/0
R
192.168.1.0/24 [120/1] via
192.168.2.1, 00:00:19, FastEthernet0/1
C
192.168.2.0/24 is directly
connected, FastEthernet0/1
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IPv6 Routing Table, Router0
Router0#sho ipv6 route
IPv6 Routing Table - 6 entries
R
C
L
C
L
L
IPv6 & Packet Tracer
D - EIGRP, EX - EIGRP external
2009:1:1::/64 [120/1]
via FE80::230:F2FF:FE0D:A6CE, Serial0/0/0
2009:1:3::/64 [0/0]
via ::, FastEthernet0/1
2009:1:3:0:20A:41FF:FE5C:E602/128 [0/0]
via ::, FastEthernet0/1
FC00:2::/112 [0/0]
via ::, Serial0/0/0
FC00:2::2/128 [0/0]
via ::, Serial0/0/0
FF00::/8 [0/0]
via ::, Null0
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Ping from PC0 to the IPv4 PC (PC1)
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Ping from PC0 to the IPv6 PC (PC2)
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Q and A
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List of Activities
and Provided
Worksheets
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List of Included Activities
Packet Tracer files accompany most Activities
 Stateless Autoconfiguration
Stateless Autoconfig.pkt
Build an IPv6 EUI-64 Address.doc (A separate activity)
 IPv6 RIP
IPv6 RIP.pkt
 IPv6 OSPF
IPv6 OSPF CCNP Lab 8-1.pkt
 Comparing ICMPv4 and ICMPv6 Packets
Comparing ICMPv4 and ICMPv6 Packet types.doc
Comparing ICMPv4 and ICMPv6 Packet types_ANSWERS.doc
ICMPv4 ICMPv6 packets.pkt
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List of Included Activities
Packet Tracer files accompany most Activities
 Broken Networks
3 Router-IPv6 RIP-broken1.pkt
IPv6 RIP-broken2.pkt
 Unconfigured Network
Unconfigured.pkt
(Configured.pkt included for reference)
 Dual Stack
Dual stack-both IPv6 and IPv4.pkt
 Upgrade IOS for PT 2620XM to support IPv6
Upgrading IOS of Packet Tracer 2620XM router.doc
Upgrading IOS of Packet Tracer 2620XM router_ANSWERS.doc
No pkt file
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Links to Additional
Information
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Topics Covered in Other Resources
See the links to resources and additional information
 Why IPv6, and why not NAT?
 Time frame for implementation
 Details of the parts of the address
 Special addresses
 Type and scope of addresses
 Details of packet header
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Topics Covered in Other Resources
See the links to resources and additional information
 Neighbor discovery
 IPv6 ACLs
 Security with IPv6
 Mobility with IPv6
 IPv4 to IPv6 migration: dual stack, tunneling, translation
 Current deployment status of IPv6
 Some IPv6 sites on internet
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Additional Information
Books and Google Books
 Deploying IPv6 Networks, Ciprian Popoviciu, Eric LevyAbegnoli, Patrick Grosstete, Cisco Press (go to)
Guide to IPv6 concepts, service implementation, and interoperability
 Cisco Self-Study: Implementing Cisco IPv6 Networks,
Regis Desmeules, Cisco Press (go to)
Design, build, configure, and support IPv6 networks
 Configuring IPv6 for Cisco IOS, Sam Brown, Eric Knipp, et
al, Callisma (go to)
Everything you need to monitor and troubleshoot IPv6 networks
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Additional Information
Books and Google Books
 Running IPv6, Iljitsch van Beijnum (go to)
How to install and operate IPv6 for Windows, Linux, Mac OS
 IPv6: Theory, Protocol and Practice, Peter Loshin (go to)
Guide to implementation and deployment of IPv6
 IPv6 Advanced Protocols Implementation, Qing Li,
Tatuya Jinmei, Keiichi Shima (go to)
Advanced IPv6 implementation of routing, multicasting, DHCPv6,
DNS, security, mobility
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Additional Information
IPv6 documentation at cisco.com
 Introduction to IPv6 – Why IPv6? (go to)
Overview and In-depth sections
 Introduction to IPv6 (go to)
Technology information, Design and Configuration Guides
 Cisco IOS IPv6 Command Reference (go to)
Excellent source for learning and troubleshooting
 Cisco IPv6 Quick Start Trial (go to)
A how-to, using equipment
 List of RFCs for IPv6 (go to)
Useful for understanding Cisco IPv6 implementations
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Additional Information
IPv6 documentation at cisco.com
 Cisco IOS IPv6 Configuration Library (go to)
Guides for implementing many IPv6 functions and protocols
 IPv6 Tunneling (go to)
Describes many different tunneling protocols
 Tunneling IPv6 through an IPv4 Network (go to)
Five-router example with configurations
 ICMPv6 Packet Types and Codes – TechNote (go to)
All of the types and codes for ICMPv6 packets
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Additional Information
Portals, Forums, information sites
 “IPv6” (go to)
General IPv6 information, FAQ, links
 go6, (“The IPv6 portal”) (go to)
Upcoming events, blog, wiki, newsletter, member area
 IPv6 Task Force (“The IPv6 Portal”) (go to)
Introduction, news, pressroom, RSS, IPv6 Guide, and Portal
 The IPv6 Forum (go to)
Events, news, book recommendations, government news,
competitions, and an “IPv4 Exhaustion Counter”!
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Additional Information
Useful RFCs and lists
 IETF RFC repository (go to)
Find an RFC if you know its number
 networksorcery.com list of IPv6 RFCs (go to)
Excellent searchable list, including obsoleted RFCs
 Microsoft IPv6 implementation (go to)
RFCs used to implement IPv6 in Windows 2003 Server and XP
 RFC 2460 IPv6 Specification (1998)
 RFC 4291- IPv6 Addressing Architecture (2006)
 RFC 2462- IPv6 Stateless Autoconfiguration (1998)
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Additional Information
Online resources
 IPv6 Deployment Guide (go to)
Detailed and indexed, 14 chapters
 IPv6 Concepts from Cisco Networkers 2006 (go to)
Still useful information
 IPv6-Intro.ppt and IPv6-Using_in_the_Network.ppt
Including Lesson Plans for each. At Academy Connection, click
File Sharing, use keyword ipv6
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Additional Information and a Thank You
Online resources
 IPv6 cheat sheet (go to)
Address ranges, ICMPv6 type numbers, header structure, more
 Technical Facts at European IPv6 Task Force (go to)
Brief summary of key information. See RFC2460 for full specs.
 A big “thank you” to Dallas Shiroma, manager of
Emerging Technologies, Pacific Center for Advanced
Technology Training, Honolulu, HI, for permission to
use of some slides in this session
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FAQ Area
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Where is IPv6 covered in Exploration?
 Network Fundamentals
6.3.6
 Routing Protocols and Concepts
1.1.3, 3.1.1, 5.1.1, 10.2.3, 11.1.1, 11.7.1
 LAN Switching and Wireless
no coverage
 Accessing the WAN
7.0.1, 7.3, 7.5.1
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Where is IPv6 covered in Discovery?
 Networking for Home and Small Businesses
No coverage
 Working at a Small-to-Medium Business or ISP
4.1.6
 Introducing Routing and Switching in the Enterprise
5.2.1
 Designing and Supporting Computer Networks
6.3
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What are the IPv6 Goal Areas in the
CCNA Certification Exam?
 Use the Cisco Learning Network (go to)
 Find CCNA Exam Topics (login required). IPv6 topics are:
Describe the technological requirements for running IPv6 in
conjunction with IPv4 (including: protocols, dual stack, tunneling,
etc)
Describe IPv6 addresses
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Where is IPv6 covered in CCNP?
CCNP: Building Scalable Internetworks
 Module 8: IPv6
8.1 Explaining IPv6
8.2 IPv6 Addressing
8.3 Dynamic IPv6 Addresses
8.4 IPv6 Routing
8.5 Implementing and Verifying OSPFv3
8.6 Using IPv6 and IPv4
8.7 IPv6 Challenge Labs
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What are the IPv6 Goal Areas in the
CCNP Certification Exams?
 Use the Cisco Learning Network (go to)
 Find CCNP Exam Topics (login required). IPv6 topics are:
 BSCI Exam:
Describe IPv6 addressing operations
Describe IPv6 interoperation with IPv4
Describe, configure or verify OSPF routing with IPv6 addressing
 BCMSN Exam: None explicitly listed
 ISCW Exam: None explicitly listed
 ONT Exam: None explicitly listed
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How can I keep all the IPv6 addressing
rules straight?
 Hosts should have globally routable addresses created
with stateless autoconfiguration
Use 2001 prefix
Use /64 eui-64 to create them
 Serial links between routers should not use globally
routable addresses
Use FC00 prefix and static addressing
Use a prefix length /64
However, the prefix length could also be, for example, /112
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More about Stateless Autoconfiguration:
eui-64 process
 Cisco uses the EUI-64 process to perform
stateless auto-configuration
 EUI stands for “extended unique identifier”
 This process expands the 48 bit MAC address to 64 bits
by inserting FFFE (16 bits)
 If the chosen address is from a unique Ethernet MAC
address, the universal / local (“u” bit) is set to 1 for global
scope
 Other interfaces, such as serial (no MAC address), use a
different method to build the address and have the u bit
set to 0 for local scope
See http://www.isi.edu/in-notes/rfc2374.txt and http://www.faqs.org/rfcs/rfc2373.html
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More about Stateless Autoconfiguration:
IPv6 Interface Identifier
Uses MAC Address
48 bit MAC Address
00
00
00
90
90
27
90
27
27
17
FF
FE
FF
FE
FC
0F
17
FC
17
FC
0F
0F
1 = Unique
000000U0
Where U=
U=1
64 bits become part
of IPv6 address
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90
27
FF
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0 = Not Unique
FE
17
FC
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What is subnetting like in IPv6?
A similar concept, but many bits available
 Sixteen subnet bits, from /49 to /64 are given to a
site
 With the 16 subnet bits, a company can have
65,535 LANs
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Does BGP Support IPv6?
 The current version of BGP is BGP4
 BGP4 does support IPv6
 See http://tools.ietf.org/html/draft-ietf-idr-bgp4-ipv6-01
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Teaching Tips
 Routers will accept more than one IPv6 address on an
interface. An error is generated only if a network overlaps
with another one on the router
 Students may make typos and enter an erroneous
address, then forget to remove it
 Ask students to use the show ipv6 interface brief
command frequently to check for this
 Unless you need IPv4 configured on an interface, use
only IPv6 in your initial examples so students clearly see
what protocol is allowing traffic to move
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What IOS do I need to run IPv6?
 You need 12.0(21)T, or later, or 12.2(2)T or later
 Not all functionality is included in these releases
Example: 12.3(2)T does not support IPv6 DHCP
 To find out when a command was introduced, see the
Cisco IOS IPv6 Command Reference (go to). Locate the
command. The listing will show when it was introduced
 Also see Cisco IOS Software Release Specifics for IPv6
Features (go to)
 The Packet Tracer 2620XM router does not support IPv6
unless you upgrade the IOS image
See the Activity included with this session: Upgrading IOS of
Packet Tracer 2620XM router.doc
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One Interface, Several Addresses
Example, of IPv4 address and four IPv6 addresses, in
addition to link-local address (not shown)
Router#show run (part of output)
ipv6 unicast-routing
interface FastEthernet0/0
ip address 192.168.0.1 255.255.255.0
duplex auto
speed auto
ipv6 address 2001:1:1::/64 eui-64
ipv6 address 2001:DB8:2::1/112
ipv6 address FC00:1:3::1/112
ipv6 address FC00:1:4::1/112
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How well does Packet Tracer 5.1 Handle
IPv6?
A few issues
If you discover one, please report it
Packet Tracer Issues
 When creating a new network, if IPv6 RIP routing
does not work, save the file, close and open PT
 Static IPv6 assignments may not work reliably with
hosts. They may be lost when PT file is re-opened.
Use stateless autoconfiguration for all router
interfaces to hosts
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Tunneling Conceptual Diagram
Islands of IPv6 can communicate through the
more common IPv4 cloud
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Tunneling Conceptual Diagram
IPv6 packet can be encapsulated in an IPv4 packet
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IPv4 / IPv6 Translation
IPv4
Network
IP and ICMP
Translator
IPv6
Network
 Translates packet headers from IPv6 to IPv4 (or
vice versa)
 Translates the addresses in the headers from IPv6
to IPv4 (or vice versa)
 Implementation is more complex than this
 See, for example,
http://www.ietf.org/proceedings/08nov/slides/behave-5.pdf
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