1. Understanding IPv6 - Addressing & Subnetting Part 3

2. Agenda Stateless Address Autoconfiguration Stateless DHCP
Global unicast address assignment
Stateless Address Autoconfiguration
Stateless DHCP
Stateful DHCP
Other types of addresses
Link Local Address
Multicast Address
Solicited Node Multicast

3. Agenda Stateless Address Autoconfiguration Stateless DHCP
Global unicast address assignment
Stateless Address Autoconfiguration
Stateless DHCP
Stateful DHCP
Other types of addresses
Link Local Address
Multicast Address
Solicited Node Multicast

4. Stateless Autoconfiguration
Global Unicast Address Assignment
Global Unicast
Manual
Dynamic
IPv6 Unnumbered
Stateless Autoconfiguration
IPv6 Address
DHCPv6
Static
EUI-64
IPv6 unnumbered is similar to the IPv4 unnumbered.

5. Stateless Autoconfig

6. Stateless Address Autoconfiguration (SLAAC)
RouterA
ipv6 unicast-routing
MAC: D2-8C-E0-4C 1
NDP Router Solicitation 2
NDP Router Advertisement
EUI-64
Stateless Address Autoconfiguration (SLAAC) is an automatic method for assigning global unicast addresses to interfaces.
No need for DHCPv6 server

7. R1(config)# ipv6 unicast-routing
DHCPv6 Server
R1(config)# ipv6 unicast-routing
NDP Router Solicitation “Need information from the router”
NDP Router Advertisement
Router Solicitation and Router Advertisement messages are about communications between a host and a router.

8. R1(config)# ipv6 unicast-routing
DHCPv6 Server
R1(config)# ipv6 unicast-routing
NDP Router Solicitation “Need information from the router”
NDP Router Advertisement
Router Solicitation and Router Advertisement messages are about communications between a host and a router.
Part of ICMPv6’s Neighbor Discovery Protocol

9. R1(config)# ipv6 unicast-routing
DHCPv6 Server
R1(config)# ipv6 unicast-routing
NDP Router Solicitation “Need information from the router”
NDP Router Advertisement
Router Solicitation and Router Advertisement messages are about communications between a host and a router.
Part of ICMPv6’s Neighbor Discovery Protocol
Routers periodically send Router Advertisement messages or response to a Router Solicitation message from a host on the link.

10. RouterA
ipv6 unicast-routing
DHCPv6 Server
The router’s Router Advertisement can determine how the host gets its dynamic address configuration.

11. RouterA
ipv6 unicast-routing
DHCPv6 Server
RouterA(config)# ipv6 unicast-routing
The router’s Router Advertisement can determine how the host gets its dynamic address configuration.
ipv6 unicast-routing command enables router to send Router Advertisements.

12. Or in response to a Router Solicitation message.
RouterA
ipv6 unicast-routing
DHCPv6 Server 1
NDP Router Solicitation “Need information from the router”
Router Advertisements are sent periodically (Cisco default every 200 seconds)
Or in response to a Router Solicitation message.

13. Or in response to a Router Solicitation message.
RouterA
ipv6 unicast-routing
DHCPv6 Server 2
NDP Router Advertisement 1
NDP Router Solicitation “Need information from the router”
Router Advertisements are sent periodically (Cisco default every 200 seconds)
Or in response to a Router Solicitation message.

14. RouterA
ipv6 unicast-routing
DHCPv6 Server 2
NDP Router Advertisement
“I’m everything you need (Prefix, Prefix-length, Default Gateway)” 1
NDP Router Solicitation “Need information from the router”
The router’s Router Advertisement can determine how the host gets its dynamic address configuration.

15. RouterA
ipv6 unicast-routing
DHCPv6 Server 2
NDP Router Advertisement
“I’m everything you need (Prefix, Prefix-length, Default Gateway)” Or
“Here is my information but you need to get other information such as DNS addresses from a DHCPv6 server.” 1
NDP Router Solicitation “Need information from the router”
The router’s Router Advertisement can determine how the host gets its dynamic address configuration.

16. RouterA
ipv6 unicast-routing
DHCPv6 Server 2
NDP Router Advertisement
“I’m everything you need (Prefix, Prefix-length, Default Gateway)” Or
“Here is my information but you need to get other information such as DNS addresses from a DHCPv6 server.”
“I can’t help you. Ask a DHCPv6 server for all your information.” 1
NDP Router Solicitation “Need information from the router”
The router’s Router Advertisement can determine how the host gets its dynamic address configuration.

17. RouterA EUI-64 NDP Router Solicitation ipv6 unicast-routing
MAC: D2-8C-E0-4C 1
NDP Router Solicitation
EUI-64

18. RouterA EUI-64 NDP Router Solicitation NDP Router Advertisement
ipv6 unicast-routing
MAC: D2-8C-E0-4C 1
NDP Router Solicitation 2
NDP Router Advertisement
From: FE80::1 (Link-local address)
EUI-64

19. RouterA EUI-64 NDP Router Solicitation NDP Router Advertisement
ipv6 unicast-routing
MAC: D2-8C-E0-4C 1
NDP Router Solicitation 2
NDP Router Advertisement
From: FE80::1 (Link-local address)
To: FF02::1 (All-hosts multicast)
EUI-64

20. RouterA EUI-64 NDP Router Solicitation NDP Router Advertisement
ipv6 unicast-routing
MAC: D2-8C-E0-4C 1
NDP Router Solicitation 2
NDP Router Advertisement
From: FE80::1 (Link-local address)
To: FF02::1 (All-hosts multicast)
Prefix: 2001:DB8:AAAA:1::
EUI-64

21. RouterA EUI-64 NDP Router Solicitation NDP Router Advertisement
ipv6 unicast-routing
MAC: D2-8C-E0-4C 1
NDP Router Solicitation 2
NDP Router Advertisement
From: FE80::1 (Link-local address)
To: FF02::1 (All-hosts multicast)
Prefix: 2001:DB8:AAAA:1::
Prefix-length: /64
EUI-64

22. RouterA EUI-64 NDP Router Solicitation NDP Router Advertisement
ipv6 unicast-routing
MAC: D2-8C-E0-4C 1
NDP Router Solicitation 2
NDP Router Advertisement
From: FE80::1 (Link-local address)
To: FF02::1 (All-hosts multicast)
Prefix: 2001:DB8:AAAA:1::
Prefix-length: /64
EUI-64 3
Prefix: 2001:DB8:AAAA:1::
Prefix-length: /64

23. RouterA EUI-64 NDP Router Solicitation NDP Router Advertisement
ipv6 unicast-routing
MAC: D2-8C-E0-4C 1
NDP Router Solicitation 2
NDP Router Advertisement
From: FE80::1 (Link-local address)
To: FF02::1 (All-hosts multicast)
Prefix: 2001:DB8:AAAA:1::
Prefix-length: /64
EUI-64 3
Prefix: 2001:DB8:AAAA:1::
Prefix-length: /64
EUI-64 Interface ID: D2-FF-FE-8C-E0-4C

24. RouterA EUI-64 NDP Router Solicitation NDP Router Advertisement
ipv6 unicast-routing
MAC: D2-8C-E0-4C 1
NDP Router Solicitation 2
NDP Router Advertisement
From: FE80::1 (Link-local address)
To: FF02::1 (All-hosts multicast)
Prefix: 2001:DB8:AAAA:1::
Prefix-length: /64
EUI-64 3
Prefix: 2001:DB8:AAAA:1::
Prefix-length: /64
EUI-64 Interface ID: D2-FF-FE-8C-E0-4C
Global Unicast Address:
2001:DB8:AAAA:1:0219:D2FF:FE8C:E04C

25. RouterA EUI-64 NDP Router Solicitation NDP Router Advertisement
ipv6 unicast-routing
MAC: D2-8C-E0-4C 1
NDP Router Solicitation 2
NDP Router Advertisement
From: FE80::1 (Link-local address)
To: FF02::1 (All-hosts multicast)
Prefix: 2001:DB8:AAAA:1::
Prefix-length: /64
EUI-64 3
Prefix: 2001:DB8:AAAA:1::
Prefix-length: /64
EUI-64 Interface ID: D2-FF-FE-8C-E0-4C
Global Unicast Address:
2001:DB8:AAAA:1:0219:D2FF:FE8C:E04C
Default Gateway: FE80::1

26. IPv6 Address. . . . . . : 2001:DB8:AAAA:1:0219:D2FF:FE8C:E04C
RouterA
ipv6 unicast-routing
MAC: D2-8C-E0-4C 1
NDP Router Solicitation 2
NDP Router Advertisement
From: FE80::1 (Link-local address)
To: FF02::1 (All-hosts multicast)
Prefix: 2001:DB8:AAAA:1::
Prefix-length: /64
EUI-64 3
Prefix: 2001:DB8:AAAA:1::
Prefix-length: /64
EUI-64 Interface ID: D2-FF-FE-8C-E0-4C
Global Unicast Address:
2001:DB8:AAAA:1:0219:D2FF:FE8C:E04C
Default Gateway: FE80::1
PC1> ipconfig
IPv6 Address : 2001:DB8:AAAA:1:0219:D2FF:FE8C:E04C
Default Gateway : fe80::1

27. Windows and the Interface ID
PC1> ipconfig Windows IP Configuration Ethernet adapter Local Area Connection: IPv6 Address : 2001:DB8:AAAA:1:0219:D2FF:FE8C:E04C Link-local IPv6 Address : fe80::50a5:8a35:a5bb:66e1%11 Default Gateway : fe80::1
Windows XP and Server 2003 use EUI-64.
Windows Vista and newer do not use EUI-64; hosts create a random 64-bit Interface ID.
The %value following the link-local address is a Windows Zone ID and not part of IPv6.

28. Live Demo
Client ipv6 address autoconfig [default] / ipv6 nd autoconfig default-route debug ipv6 nd show ipv6 int br show ipv6 int show ipv6 route See Wireshark capture 1.

29. M and O bits M means = Managed
O means = Other These bits are set in RA ( Router Advertisement) and sent to end devices
M=0 and O=0 use SLAAC and use static config for DNS config
M=0 and O=1 use SLAAC and use DHCPv6 server for DNS config
This is called Stateless DHCP as DHCP server does not maintain any binding
M=1 and O=0 use DHCPv6 server to get all the information
This is called as Stateful DHCP as the server maintains all the bindings
M=1 and O=1 Invalid

30. Stateless DHCP

31. NDP Router Advertisement
ipv6 unicast-routing
DHCPv6 Server
DHCPv6 Server
Stateless Addressing 1
NDP Router Solicitation
NDP Router Advertisement
“Here is my information but you need to get other information such as DNS addresses from a DHCPv6 server.” Or
“I can’t help you. Ask a DHCPv6 server for all your information.” 2

32. “Stateless DHCPv6” RouterA Not always generated
ipv6 unicast-routing
“Stateless DHCPv6”
DHCPv6 Server
Address obtained via SLAAC 1
DHCPv6 Solicit Message
“I need a DHCPv6 Server.”
Not always generated 2
DHCPv6 Advertise Message
“I’m a DHCPv6 Server.” 3
DHCPv6 Information Request Message
“I need some other information.
DHCPv6 Reply Message
“Here is your other information.” 4

33. Live Demo
Client ipv6 address autoconfig [default] / ipv6 nd autoconfig default-route sh ipv6 dhcp int f0/0 debug dhcp Server ipv6 dhcp pool DHCP ipv6 nd other-config-flag ipv6 dhcp server DHCP sh ipv6 dhcp pool debug ipv6 dhcp See Wireshark capture 2.

34. Stateful DHCPv6

35. “Stateful DHCPv6” RouterA DHCPv6 Addressing DHCPv6 Solicit Message
ipv6 unicast-routing
“Stateful DHCPv6”
DHCPv6 Server
DHCPv6 Addressing 1
DHCPv6 Solicit Message
“I need a DHCPv6 Server.” 2
DHCPv6 Advertise Message
“I’m a DHCPv6 Server.” 3
DHCPv6 Request Message
“I need addressing information.
DHCPv6 Reply Message
“Here is your address and other information.” 4

36. Live Demo
Client ipv6 address dhcp sh ipv6 dhcp int f0/0 debug dhcp Server ipv6 dhcp pool DHCP ipv6 nd managed-config-flag ipv6 dhcp server DHCP sh ipv6 dhcp pool debug ipv6 dhcp See Wireshark capture 3.

37. Agenda Stateless Address Autoconfiguration Stateless DHCP
Global unicast address assignment
Stateless Address Autoconfiguration
Stateless DHCP
Stateful DHCP
Other types of addresses
Link Local Address
Multicast Address
Solicited Node Multicast

38. IPv6 Address Types Note: There are no broadcast addresses in IPv6
IPv6 Addressing
Unicast
Multicast
Anycast
Assigned
Solicited Node
FF00::/8
FF02::1:FF00:0000/104
Unspecified
Embedded IPv4
Global Unicast
Link-Local
Loopback
Unique Local
2000::/3
3FFF::/3
FE80::/10
FEBF::/10
::1/128
::/128
FC00::/7
FDFF::/7
::/80
Note: There are no broadcast addresses in IPv6

39. Link-local Unicast Address

40. Link-Local Unicast IPv6 Addressing Unicast Multicast Anycast Assigned
Solicited Node
FF00::/8
FF02::1:FF00:0000/104
Unspecified
Embedded IPv4
Global Unicast
Link-Local
Loopback
Unique Local
2000::/3
3FFF::/3
FE80::/10
FEBF::/10
::1/128
::/128
FC00::/7
FDFF::/7
::/80

41. Link-local unicast Interface ID Range: FE80::/10 FEBF::/10 FE80::/10
10 bits
Remaining 54 bits
64 bits
/64
xx xxxx
Interface ID
FE80::/10
EUI-64, Random or Manual Configuration
Range:
FE80::/10
FEBF::/10

42. Link-local unicast Interface ID Range: FE80::/10 FEBF::/10 FE80::/10
10 bits
Remaining 54 bits
64 bits
/64
xx xxxx
Interface ID
FE80::/10
EUI-64, Random or Manual Configuration
Range:
FE80::/10
FEBF::/10

43. Link-local unicast Used to communicate with other devices on the link.
10 bits
Remaining 54 bits
64 bits
/64
xx xxxx
Interface ID
FE80::/10
EUI-64, Random or Manual Configuration
Used to communicate with other devices on the link.

44. Link-local unicast Used to communicate with other devices on the link.
10 bits
Remaining 54 bits
64 bits
/64
xx xxxx
Interface ID
FE80::/10
EUI-64, Random or Manual Configuration
Used to communicate with other devices on the link.
Are NOT routable off the link.

45. Link-local unicast Used to communicate with other devices on the link.
10 bits
Remaining 54 bits
64 bits
/64
xx xxxx
Interface ID
FE80::/10
EUI-64, Random or Manual Configuration
Used to communicate with other devices on the link.
Are NOT routable off the link.
An IPv6 device must have at least a link-local address.

46. Link-local unicast Used to communicate with other devices on the link.
10 bits
Remaining 54 bits
64 bits
/64
xx xxxx
Interface ID
FE80::/10
EUI-64, Random or Manual Configuration
Used to communicate with other devices on the link.
Are NOT routable off the link.
An IPv6 device must have at least a link-local address.
Used by:
A host to communicate on the IPv6 network before it gets a global unicast address.

47. Link-local unicast Used to communicate with other devices on the link.
10 bits
Remaining 54 bits
64 bits
/64
xx xxxx
Interface ID
FE80::/10
EUI-64, Random or Manual Configuration
Used to communicate with other devices on the link.
Are NOT routable off the link.
An IPv6 device must have at least a link-local address.
Used by:
A host to communicate on the IPv6 network before it gets a global unicast address.
A host as the default gateway address.

48. Link-local unicast Used to communicate with other devices on the link.
10 bits
Remaining 54 bits
64 bits
/64
xx xxxx
Interface ID
FE80::/10
EUI-64, Random or Manual Configuration
Used to communicate with other devices on the link.
Are NOT routable off the link.
An IPv6 device must have at least a link-local address.
Used by:
A host to communicate on the IPv6 network before it gets a global unicast address.
A host as the default gateway address.
Adjacent routers to exchange routing updates.

49. 2001:0DB8:CAFE:A001::/64
Global Unicast:
2001:0DB8:CAFE:1::1/64 R1
Ser 0/0/0 .1
Ser 0/0/0 .2 R2
Fa0/0
Link-local address: ?
Link-local address automatically created when (before) the global unicast address is.
2001:0DB8:CAFE:1::/64
Global Unicast:
2001:0DB8:CAFE:1::0100
PC-1
Link-local address: ?

50. 2001:0DB8:CAFE:A001::/64
Global Unicast:
2001:0DB8:CAFE:1::1/64 R1
Ser 0/0/0 .1
Ser 0/0/0 .2 R2
Fa0/0
Link-local address: ?
Link-local address automatically created when (before) the global unicast address is.
FE bit Interface ID
EUI-64 Format or
Randomly generated
2001:0DB8:CAFE:1::/64
Global Unicast:
2001:0DB8:CAFE:1::0100
PC-1
Link-local address: ?

51. Link-local address can also be created statically.
2001:0DB8:CAFE:A001::/64
Global Unicast:
2001:0DB8:CAFE:1::1/64 R1
Ser 0/0/0 .1
Ser 0/0/0 .2 R2
Fa0/0
Link-local address: ?
Link-local address automatically created when (before) the global unicast address is.
FE bit Interface ID
EUI-64 Format
Randomly generated
Link-local address can also be created statically.
2001:0DB8:CAFE:1::/64
Global Unicast:
2001:0DB8:CAFE:1::0100
PC-1
Link-local address: ?

52. show ipv6 interface brief command on router R1
R1# show ipv6 interface brief
FastEthernet0/ [up/up]
FE80::203:6BFF:FEE9:D480
2001:DB8:CAFE:1::1
Serial0/0/ [up/up]
2001:DB8:CAFE:A001::1
Serial0/0/ [up/up]
2001:DB8:CAFE:A003::1
R1#
Link-local unicast address
Global unicast address
Link-local address automatically created when (before) the global unicast address.

53. show ipv6 interface brief command on router R1
R1# show ipv6 interface brief
FastEthernet0/ [up/up]
FE80::203:6BFF:FEE9:D480
2001:DB8:CAFE:1::1
Serial0/0/ [up/up]
2001:DB8:CAFE:A001::1
Serial0/0/ [up/up]
2001:DB8:CAFE:A003::1
R1#
Link-local unicast address
Global unicast address
Link-local address automatically created when (before) the global unicast address.
By default, IOS will use modified EUI-64 format.

54. R1# show interface fastethernet 0/0
FastEthernet0/0 is up, line protocol is up
Hardware is AmdFE, address is be9.d480 (bia be9.d480)
<output omitted for brevity>
Ethernet MAC address

55. Modified EUI-64 Format 00 03 6B E9 D4 80 02 03 6B FF FE E9 D4 80 OUI
24 bits
Device Identifier
24 bits
Modified EUI-64 Format
Hexadecimal 00 03 6B E9 D4 80
Step 1: Split the MAC address
Binary
Step 2: Insert FFFE
Binary
Step 3: Flip the U/L bit
Binary
Modified EUI-64 Interface ID in Hexadecimal Notation
Binary 02 03 6B FF FE E9 D4 80

56. R1# show interface fastethernet 0/0
FastEthernet0/0 is up, line protocol is up
Hardware is AmdFE, address is be9.d480 (bia be9.d480)
<output omitted for brevity>
R1# show ipv6 interface fastethernet 0/0
IPv6 is enabled, link-local address is FE80::203:6BFF:FEE9:D480
Global unicast address(es):
2001:DB8:AAAA:1::1, subnet is 2001:DB8:AAAA:1::/64
Ethernet MAC address
Link-local address using EUI-64 format

57. R1 R2 Global Unicast: 2001:0DB8:CAFE:1::0100 2001:0DB8:CAFE:A001::/64
Ser 0/0/0 .1
Ser 0/0/0 .2 R2
Fa0/0
FE80::203:6BFF:FEE9:D480
(EUI-64)
Dynamic link-local addresses can be difficult to identify.
2001:0DB8:CAFE:1::/64
Global Unicast:
2001:0DB8:CAFE:1::0100
PC-1
FE80::50A5:8A35:A5BB:66E1

58. R1 R2 Global Unicast: 2001:0DB8:CAFE:1::0100 2001:0DB8:CAFE:A001::/64
Ser 0/0/0 .1
Ser 0/0/0 .2 R2
Fa0/0
FE80::203:6BFF:FEE9:D480
(EUI-64)
Dynamic link-local addresses can be difficult to identify.
Routers use link-local addresses for:
Exchanging routing updates
Default gateway address for hosts
2001:0DB8:CAFE:1::/64
Global Unicast:
2001:0DB8:CAFE:1::0100
PC-1
FE80::50A5:8A35:A5BB:66E1

59. R1 R2 Global Unicast: 2001:0DB8:CAFE:1::0100 2001:0DB8:CAFE:A001::/64
Ser 0/0/0 .1
Ser 0/0/0 .2 R2
Fa0/0
FE80::203:6BFF:FEE9:D480
(EUI-64)
FE80::1
(Static)
Dynamic link-local addresses can be difficult to identify.
Routers use link-local addresses for:
Exchanging routing updates
Default gateway address for hosts
Static link-local addresses are easier to remember and identify.
2001:0DB8:CAFE:1::/64
Global Unicast:
2001:0DB8:CAFE:1::0100
PC-1
FE80::50A5:8A35:A5BB:66E1

60. R1 R2 Global Unicast: 2001:0DB8:CAFE:1::0100 2001:0DB8:CAFE:A001::/64
Ser 0/0/0 .1
Ser 0/0/0 .2 R2
Fa0/0
FE80::203:6BFF:FEE9:D480
(EUI-64)
FE80::1
(Static)
Dynamic link-local addresses can be difficult to identify.
Routers use link-local addresses for:
Exchanging routing updates
Default gateway address for hosts
Static link-local addresses are easier to remember and identify.
Link-local addresses only have to be unique on the link!
2001:0DB8:CAFE:1::/64
Global Unicast:
2001:0DB8:CAFE:1::0100
PC-1
FE80::50A5:8A35:A5BB:66E1

61. R1(config)# interface fastethernet 0/0
R1(config-if)# ipv6 address fe80::1 ?
link-local Use link-local address
R1(config)#
Static Link-local Address

62. R1(config)# interface fastethernet 0/0
R1(config-if)# ipv6 address fe80::1 ?
link-local Use link-local address
R1(config-if)# ipv6 address fe80::1 link-local
R1(config-if)# exit
R1(config)#
Static Link-local Address

63. R1(config)# interface fastethernet 0/0
R1(config-if)# ipv6 address fe80::1 ?
link-local Use link-local address
R1(config-if)# ipv6 address fe80::1 link-local
R1(config-if)# exit
R1(config)# interface serial 0/0/0
R1#
Static Link-local Address

64. Static Link-local Address
R1(config)# interface fastethernet 0/0
R1(config-if)# ipv6 address fe80::1 ?
link-local Use link-local address
R1(config-if)# ipv6 address fe80::1 link-local
R1(config-if)# exit
R1(config)# interface serial 0/0/0
R1#
R1# show ipv6 interface brief
FastEthernet0/ [up/up]
FE80::1
2001:DB8:CAFE:1::1
Serial0/0/ [up/up]
2001:DB8:CAFE:A001::1
Static Link-local Address
Same link-local unicast address (best practice)

65. R1# show running-config!
interface FastEthernet0/0
no ip address
ipv6 address FE80::1 link-local
ipv6 address 2001:DB8:CAFE:1::1/64
interface Serial0/0/0
ipv6 address 2001:DB8:CAFE:A001::1/64

66. R1 R2 Ping Link-local Address FE80::1 FE80::2 Global Unicast:
2001:0DB8:CAFE:1::1/64 R1
Ser 0/0/0 .1
Ser 0/0/0 .2 R2
Fa0/0
2001:0DB8:CAFE:A001::/64
FE80::1
R1# ping fe80::2

67. Must include exit-interface
Ping Link-local Address
FE80::1
FE80::2
Global Unicast:
2001:0DB8:CAFE:1::1/64 R1
Ser 0/0/0 .1
Ser 0/0/0 .2 R2
Fa0/0
2001:0DB8:CAFE:A001::/64
FE80::1
R1# ping fe80::2
Output Interface: ser 0/0/0
Must include exit-interface

68. Must include exit-interface
Ping Link-local Address
FE80::1
FE80::2
Global Unicast:
2001:0DB8:CAFE:1::1/64 R1
Ser 0/0/0 .1
Ser 0/0/0 .2 R2
Fa0/0
2001:0DB8:CAFE:A001::/64
FE80::1
R1# ping fe80::2
Output Interface: ser 0/0/0
% Invalid interface. Use full interface name without spaces (e.g. Serial0/1)
Output Interface: serial0/0/0
Must include exit-interface

69. Must include exit-interface
Ping Link-local Address
FE80::1
FE80::2
Global Unicast:
2001:0DB8:CAFE:1::1/64 R1
Ser 0/0/0 .1
Ser 0/0/0 .2 R2
Fa0/0
2001:0DB8:CAFE:A001::/64
FE80::1
R1# ping fe80::2
Output Interface: ser 0/0/0
% Invalid interface. Use full interface name without spaces (e.g. Serial0/1)
Output Interface: serial0/0/0
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to FE80::2, timeout is 2 secs:
!!!!!
Must include exit-interface

70. ipv6 enable command
Router(config)# interface fastethernet 0/1
Link-local addresses are automatically created whenever a global unicast address is configured, or when the ipv6 enable command is entered.

71. ipv6 enable command
Router(config)# interface fastethernet 0/1
Router(config-if)# ipv6 enable
Router(config-if)# end
Router#
Link-local addresses are automatically created whenever a global unicast address is configured, or when the ipv6 enable command is entered.
The ipv6 enable command will:

72. ipv6 enable command
Router(config)# interface fastethernet 0/1
Router(config-if)# ipv6 enable
Router(config-if)# end
Router#
Link-local addresses are automatically created whenever a global unicast address is configured, or when the ipv6 enable command is entered.
The ipv6 enable command will:
Create a link-local address when there is no global unicast address

73. ipv6 enable command
Router(config)# interface fastethernet 0/1
Router(config-if)# ipv6 enable
Router(config-if)# end
Router# show ipv6 interface brief
FastEthernet0/ [up/up]
FE80::20C:30FF:FE10:92E1
Router#
Link-local unicast address only
Link-local addresses are automatically created whenever a global unicast address is configured, or when the ipv6 enable command is entered.
The ipv6 enable command will:
Create a link-local address when there is no global unicast address

74. ipv6 enable command
Router(config)# interface fastethernet 0/1
Router(config-if)# ipv6 enable
Router(config-if)# end
Router# show ipv6 interface brief
FastEthernet0/ [up/up]
FE80::20C:30FF:FE10:92E1
Router#
Link-local unicast address only
Link-local addresses are automatically created whenever a global unicast address is configured, or when the ipv6 enable command is entered.
The ipv6 enable command will:
Create a link-local address when there is no global unicast address
Maintain the link-local address even when the global unicast address is removed.

75. Windows Link-local address
PC1> ipconfig Windows IP Configuration Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : IPv6 Address : 2001:db8:cafe:1::100 Link-local IPv6 Address : fe80::50a5:8a35:a5bb:66e1%11 Default Gateway : 2001:db8:cafe:1::1
Windows operating systems, Windows XP and Server 2003 use EUI-64.
Windows Vista and newer do not use EUI-64 create a random 64-bit Interface ID.
The %value following the link-local address is a Windows Zone ID and not part of IPv6.

76. MAC Link-local address
Mymac$ ifconfig en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500 ether c4:2c:03:2a:b5:a2 inet6 fe80::c62c:3ff:fe2a:b5a2
My MAC OS 10.6 uses EUI-64 but you check with your OS flavor and version.
Many Linux flavors are moving to random Interface IDs

77. Multicast Addresses

78. Multicast Addresses Similar to IPv4 multicast – one-to-many addressing
IPv6 Addressing
Unicast
Multicast
Anycast
Assigned
Solicited Node
FF00::/8
FF02::1:FF00:0000/104
Unspecified
Embedded IPv4
Global Unicast
Link-Local
Loopback
Unique Local
2000::/3
3FFF::/3
FE80::/10
FEBF::/10
::1/128
::/128
FC00::/7
FDFF::/7
::/80
Similar to IPv4 multicast – one-to-many addressing

79. 0 Permanent, well-known multicast address assigned by IANA
8 bits
4 bits
4 bits
112bits
Flag
Scope
Group ID
FF00::/8
Flag
0 Permanent, well-known multicast address assigned by IANA
1 Non-permanently-assigned, “dynamically" assigned multicast address
Scope (partial list)
0 Reserved
1 Interface-Local scope
2 Link-Local scope
5 Site-Local scope
8 Organization-Local scope

80. FF02 – “2” means link-local scope
R1# show ipv6 interface fastethernet 0/0
FastEthernet0/0 is up, line protocol is up
IPv6 is enabled, link-local address is FE80::203:6BFF:FEE9:D480
Global unicast address(es):
2001:DB8:AAAA:1::1, subnet is 2001:DB8:AAAA:1::/64
Joined group address(es):
FF02::1
FF02::2
FF02::1:FF00:1
FF02::1:FFE9:D480
<output omitted for brevity>
Member of these Multicast Groups
All-nodes on this link (Assigned)
FF02 – “2” means link-local scope

81. FF02 – “2” means link-local scope
R1# show ipv6 interface fastethernet 0/0
FastEthernet0/0 is up, line protocol is up
IPv6 is enabled, link-local address is FE80::203:6BFF:FEE9:D480
Global unicast address(es):
2001:DB8:AAAA:1::1, subnet is 2001:DB8:AAAA:1::/64
Joined group address(es):
FF02::1
FF02::2
FF02::1:FF00:1
FF02::1:FFE9:D480
<output omitted for brevity>
Member of these Multicast Groups
All-nodes on this link (Assigned)
All-routers on this link: IPv6 routing enabled (Assigned)
FF02 – “2” means link-local scope

82. FF02 – “2” means link-local scope
R1# show ipv6 interface fastethernet 0/0
FastEthernet0/0 is up, line protocol is up
IPv6 is enabled, link-local address is FE80::203:6BFF:FEE9:D480
Global unicast address(es):
2001:DB8:AAAA:1::1, subnet is 2001:DB8:AAAA:1::/64
Joined group address(es):
FF02::1
FF02::2
FF02::1:FF00:1
FF02::1:FFE9:D480
<output omitted for brevity>
Member of these Multicast Groups
All-nodes on this link (Assigned)
All-routers on this link: IPv6 routing enabled (Assigned)
Solicited-node multicast address for Global Address
FF02 – “2” means link-local scope

83. FF02 – “2” means link-local scope What is Solicited node? (coming)
R1# show ipv6 interface fastethernet 0/0
FastEthernet0/0 is up, line protocol is up
IPv6 is enabled, link-local address is FE80::203:6BFF:FEE9:D480
Global unicast address(es):
2001:DB8:AAAA:1::1, subnet is 2001:DB8:AAAA:1::/64
Joined group address(es):
FF02::1
FF02::2
FF02::1:FF00:1
FF02::1:FFE9:D480
<output omitted for brevity>
Member of these Multicast Groups
All-nodes on this link (Assigned)
All-routers on this link: IPv6 routing enabled (Assigned)
Solicited-node multicast address for Global Address
Solicited-node multicast address for Link-local Unicast Address
FF02 – “2” means link-local scope
What is Solicited node? (coming)

84. Enabling IPv6 Routing
R1(config)# interface fastethernet 0/0
R1(config-if)# ipv6 address 2001:0db8:cafe:0001::1/64
A router’s interfaces can be enabled for IPv6 (get an IPv6 address) like any other device on the network.

85. Enabling IPv6 Routing
R1(config)# ipv6 unicast-routing
R1# show ipv6 interface fastethernet 0/0
Joined group address(es):
FF02::2
All-routers on this link (Assigned)
A router’s interfaces can be enabled for IPv6 (get an IPv6 address) like any other device on the network.
For the router to “act” as an IPv6 router it must be enabled with the ipv6 unicast-routing command.

86. Enabling IPv6 Routing
R1(config)# ipv6 unicast-routing
R1# show ipv6 interface fastethernet 0/0
Joined group address(es):
FF02::2
All-routers on this link (Assigned)
A router’s interfaces can be enabled for IPv6 (get an IPv6 address) like any other device on the network.
For the router to “act” as an IPv6 router it must be enabled with the ipv6 unicast-routing command.
This enables the router to:
Send Router Advertisement messages

87. Enabling IPv6 Routing
R1(config)# ipv6 unicast-routing
R1# show ipv6 interface fastethernet 0/0
Joined group address(es):
FF02::2
All-routers on this link (Assigned)
A router’s interfaces can be enabled for IPv6 (get an IPv6 address) like any other device on the network.
For the router to “act” as an IPv6 router it must be enabled with the ipv6 unicast-routing command.
This enables the router to:
Send Router Advertisement messages
Enable the forwarding of IPv6 packets.

88. Enabling IPv6 Routing
R1(config)# ipv6 unicast-routing
R1# show ipv6 interface fastethernet 0/0
Joined group address(es):
FF02::2
All-routers on this link (Assigned)
A router’s interfaces can be enabled for IPv6 (get an IPv6 address) like any other device on the network.
For the router to “act” as an IPv6 router it must be enabled with the ipv6 unicast-routing command.
This enables the router to:
Send Router Advertisement messages
Enable the forwarding of IPv6 packets.
Participate in IPv6 routing protocols: RIPng, EIGRP for IPv6, OSPFv3

89. Similar to IPv4 Multicast

90. Identify the following IPv6 Multicast addresses
FF02::2
FF02::5
FF02::6
FF02::9
FF02::A
All the routers within an link
AllSPF Routers ( OSPFv3)
AllDRs routers (OSPFv3)
All RIP Routers
All EIGRP Routers

91. Solicited Node Multicast

92. Devices listen for their unicast addresses.
NIC: I will listen for my MAC address
IP: I listen for my IP addresses (Global and Link-local)
PC-2
IP: Global or Link-local
MAC
Global Unicast Address:
Link-local Unicast Address:
MAC Unicast Address:
2001:0DB8:AAAA:0001:0000:0000:0000:0200
FE80::1111:2222:3333:4444
00-19-D2-8C-E0-4C
Devices listen for their unicast addresses.

93. Devices listen for their unicast addresses.
NIC: I will listen for my MAC address
IP: I listen for my IP addresses (Global and Link-local)
PC-2
IP: Global or Link-local
MAC
Global Unicast Address:
Link-local Unicast Address:
MAC Unicast Address:
2001:0DB8:AAAA:0001:0000:0000:0000:0200
FE80::1111:2222:3333:4444
00-19-D2-8C-E0-4C
Devices listen for their unicast addresses.
Devices also listen for their multicast addresses…

94. Solicited-node multicast addresses for PC2
IP: I will also listen for my IP multicast addresses (Global and Link-local)
PC-2
Global Unicast Address:
Link-local Unicast Address:
MAC Unicast Address:
2001:0DB8:AAAA:0001:0000:0000:0000:0200
FE80::1111:2222:3333:4444
00-19-D2-8C-E0-4C

95. Solicited-node multicast addresses for PC2
IP: I will also listen for my IP multicast addresses (Global and Link-local)
PC-2
Global Unicast Address:
Solicited Node (Global):
Link-local Unicast Address:
MAC Unicast Address:
2001:0DB8:AAAA:0001:0000:0000:0000:0200
FF02::1:FF00:200
FE80::1111:2222:3333:4444
00-19-D2-8C-E0-4C

96. Solicited-node multicast addresses for PC2
IP: I will also listen for my IP multicast addresses (Global and Link-local)
PC-2
Global Unicast Address:
Solicited Node (Global):
Link-local Unicast Address:
Solicited Node (Link-local):
MAC Unicast Address:
2001:0DB8:AAAA:0001:0000:0000:0000:0200
FF02::1:FF00:200
FE80::1111:2222:3333:4444
FF02::1:FF33:4444
00-19-D2-8C-E0-4C

97. Solicited-node multicast addresses for PC2
33-33-XX: is the OUI for IPv6 multicast
NIC: I will also listen for my MAC multicast addresses
IP: I will also listen for my IP multicast addresses (Global and Link-local)
PC-2
Global Unicast Address:
Solicited Node (Global):
Link-local Unicast Address:
Solicited Node (Link-local):
MAC Unicast Address:
Solicited Node (MAC):
2001:0DB8:AAAA:0001:0000:0000:0000:0200
FF02::1:FF00:200
FE80::1111:2222:3333:4444
FF02::1:FF33:4444
00-19-D2-8C-E0-4C
33-33-FF
33-33-FF

98. Solicited-node multicast addresses for PC2
33-33-XX: is the OUI for IPv6 multicast
NIC: I will also listen for my MAC multicast addresses
IP: I will also listen for my IP multicast addresses (Global and Link-local)
PC-2
Broadcasts
Global Unicast Address:
Solicited Node (Global):
Link-local Unicast Address:
Solicited Node (Link-local):
MAC Unicast Address:
Solicited Node (MAC):
2001:0DB8:AAAA:0001:0000:0000:0000:0200
FF02::1:FF00:200
FE80::1111:2222:3333:4444
FF02::1:FF33:4444
00-19-D2-8C-E0-4C
33-33-FF
33-33-FF

99. Solicited-node multicast address
Unicast/Anycast Address
128 bits
Subnet ID
Global Routing Prefix
Interface ID
Devices create a solicited node multicast address for their unicast (and anycast) addresses including:
Global Unicast Address
Link-local Address

100. Solicited-node multicast address
Unicast/Anycast Address
128 bits
Subnet ID
Global Routing Prefix
Interface ID
Solicited-Node Multicast Address
FF02
0000
0000
0000
0000
0001 FF
104 bits
24 bits
FF02:0:0:0:0:1:FF00::/104
Uses the prefix: FF02:0:0:0:0:1:FF00::/104

101. Solicited-node multicast address
Unicast/Anycast Address
104 bits
24 bits
Subnet ID
Global Routing Prefix
Interface ID
Copy
Solicited-Node Multicast Address
FF02
0000
0000
0000
0000
0001 FF
104 bits
24 bits
FF02:0:0:0:0:1:FF00::/104
Uses the prefix: FF02:0:0:0:0:1:FF00::/104
+ last 24 bits of Global or Link-local unicast address

102. Solicited-node multicast address
Unicast/Anycast Address
104 bits
24 bits
Subnet ID
Global Routing Prefix
Interface ID
Copy
Solicited-Node Multicast Address
FF02
0000
0000
0000
0000
0001 FF
104 bits
24 bits
FF02:0:0:0:0:1:FF00::/104
Used as a destination address when don’t know the unicast address.
Address Resolution (“ARP”) and Duplicate Address Detection (“Gratuitous ARP”)

103. Solicited-node multicast address
Unicast/Anycast Address
104 bits
24 bits
Subnet ID
Global Routing Prefix
Interface ID
Copy
Solicited-Node Multicast Address
FF02
0000
0000
0000
0000
0001 FF
104 bits
24 bits
FF02:0:0:0:0:1:FF00::/104
Used as a destination address when don’t know the unicast address.
Address Resolution (“ARP”) and Duplicate Address Detection (“Gratuitous ARP”)
Same intent as a broadcast but more efficient.

104. Solicited-node multicast address
Unicast/Anycast Address
104 bits
24 bits
Subnet ID
Global Routing Prefix
Interface ID
Copy
Solicited-Node Multicast Address
FF02
0000
0000
0000
0000
0001 FF
104 bits
24 bits
FF02:0:0:0:0:1:FF00::/104
Used as a destination address when don’t know the unicast address.
Address Resolution (“ARP”) and Duplicate Address Detection (“Gratuitous ARP”)
Same intent as a broadcast but more efficient.
Devices process packets with their solicited node multicast address as the destination address: IP and MAC.

105. R1# show ipv6 interface fastethernet 0/0
FastEthernet0/0 is up, line protocol is up
IPv6 is enabled, link-local address is FE80::203:6BFF:FEE9:D480
Global unicast address(es):
2001:DB8:AAAA:1::1, subnet is 2001:DB8:AAAA:1::/64
Joined group address(es):
FF02::1
FF02::2
FF02::1:FF00:1
FF02::1:FFE9:D480
<output omitted for brevity>
Last 24 bits of Global Unicast Address
Solicited-node multicast address for Global Unicast Address

106. R1# show ipv6 interface fastethernet 0/0
FastEthernet0/0 is up, line protocol is up
IPv6 is enabled, link-local address is FE80::203:6BFF:FEE9:D480
Global unicast address(es):
2001:DB8:AAAA:1::1, subnet is 2001:DB8:AAAA:1::/64
Joined group address(es):
FF02::1
FF02::2
FF02::1:FF00:1
FF02::1:FFE9:D480
<output omitted for brevity>
Last 24 bits of Link-Local Unicast Address
Solicited-node multicast address for Link-local Unicast Address

107. Router(config)# interface fastethenet 0/0
Router(config-if)# ipv6 address 2001:db8:cafe:1::/64 eui-64
Router# show ipv6 interface fastethernet 0/0
FastEthernet0/0 is up, line protocol is up
IPv6 is enabled, link-local address is FE80::21B:CFF:FEC2:82D8
No Virtual link-local address(es):
Global unicast address(es):
2001:DB8:CAFE:1:21B:CFF:FEC2:82D8, subnet is 2001:DB8:CAFE:1::/64 [EUI]
Joined group address(es):
FF02::1
FF02::2
FF02::1:FFC2:82D8
Last 24 bits of both Unicast Addresses
Solicited-node multicast address for Global and Link-local unicast addresses
NOTE: If the Global and Link-local addresses used EUI-64 the last 24 bits would be the same and there would only be one solicited node address.

108. Solicited-node multicast addresses for PC2
33-33-XX: is the OUI for IPv6 multicast
NIC: I will also listen for my MAC multicast addresses
IP: I will also listen for my IP multicast addresses (Global and Link-local)
PC-2
Global Unicast Address:
Solicited Node (Global):
Link-local Unicast Address:
Solicited Node (Link-local):
MAC Unicast Address:
Solicited Node (MAC):
2001:0DB8:AAAA:0001:0000:0000:0000:0200
FF02::1:FF00:200
FE80::1111:2222:3333:4444
FF02::1:FF33:4444
00-19-D2-8C-E0-4C
33-33-FF
33-33-FF

109. PC2’s Global Unicast Address
Global Routing Prefix
Subnet ID
Interface ID
104 bits
2001:0DB8:AAAA
0001
0000:0000:00
00:0200

110. PC2’s Global Unicast Address
Global Routing Prefix
Subnet ID
Interface ID
104 bits
24 bits
2001:0DB8:AAAA
0001
0000:0000:00
00:0200
Copy
PC2’s IPv6 Solicited-Node Multicast Address
FF02
0000
0000
0000
0000
0001 FF
00:0200

111. PC2’s Global Unicast Address
Global Routing Prefix
Subnet ID
Interface ID
104 bits
24 bits
2001:0DB8:AAAA
0001
0000:0000:00
00:0200
Copy
PC2’s IPv6 Solicited-Node Multicast Address
FF02
0000
0000
0000
0000
0001 FF
00:0200
Copy
Solicited-node Multicast address mapped to Ethernet destination MAC address
33-33 FF
PC2’s mapped solicited-node Ethernet multicast address : FF

112. Why Solicited Node Addresses?
At Layer 2 and 3 I am listening for a lot of addresses.
PC-2
Global Unicast Address:
Solicited Node (Global):
MAC Unicast Address:
Solicited Node (MAC):
2001:0DB8:AAAA:0001:0000:0000:0000:0200
FF02::1:FF00:200
33-33-FF

113. Why Solicited Node Addresses?
Broadcasts are sent to all devices.
At Layer 2 and 3 I am listening for a lot of addresses.
PC-2
Global Unicast Address:
Solicited Node (Global):
MAC Unicast Address:
Solicited Node (MAC):
2001:0DB8:AAAA:0001:0000:0000:0000:0200
FF02::1:FF00:200
33-33-FF

114. Why Solicited Node Addresses?
Broadcasts are sent to all devices.
Devices must process all broadcast at least to layer 3.
At Layer 2 and 3 I am listening for a lot of addresses.
PC-2
Global Unicast Address:
Solicited Node (Global):
MAC Unicast Address:
Solicited Node (MAC):
2001:0DB8:AAAA:0001:0000:0000:0000:0200
FF02::1:FF00:200
33-33-FF

115. Why Solicited Node Addresses?
Broadcasts are sent to all devices.
Devices must process all broadcast at least to layer 3.
Solicited Node Multicasts are only processed by those devices with the matching last 24 bits (usually one device).
At Layer 2 and 3 I am listening for a lot of addresses.
PC-2
Global Unicast Address:
Solicited Node (Global):
MAC Unicast Address:
Solicited Node (MAC):
2001:0DB8:AAAA:0001:0000:0000:0000:0200
FF02::1:FF00:200
33-33-FF

116. Why Solicited Node Addresses?
Broadcasts are sent to all devices.
Devices must process all broadcast at least to layer 3.
Solicited Node Multicasts are only processed by those devices with the matching last 24 bits (usually one device).
If I know the IPv6 address but not the MAC address I can send it to a solicited node addresses instead of a broadcast to everyone…
At Layer 2 and 3 I am listening for a lot of addresses.
PC-2
Global Unicast Address:
Solicited Node (Global):
MAC Unicast Address:
Solicited Node (MAC):
2001:0DB8:AAAA:0001:0000:0000:0000:0200
FF02::1:FF00:200
33-33-FF

117. Address Resolution NDP Neighbor Solicitation Message
Destination: Solicited-node Multicast
“Whoever has 2001:DB8:AAAA:1::200 send me your Ethernet MAC address”
2001:DB8:AAAA:1::200
FF02::1:FF00:200
PC-2
2001:DB8:AAAA:1::100
PC-1
MAC: D2-8C-E0-4C
33-33-FF

118. I know the target IPv6 Address…
Address Resolution
NDP Neighbor Solicitation Message
Destination: Solicited-node Multicast
“Whoever has 2001:DB8:AAAA:1::200 send me your Ethernet MAC address”
2001:DB8:AAAA:1::200
FF02::1:FF00:200
PC-2
2001:DB8:AAAA:1::100
PC-1
MAC: D2-8C-E0-4C
33-33-FF
Ethernet
IPv6 Header
ICMPv6
Target IPv6
2001:DB8:AAAA:1
::200
I know the target IPv6 Address…

119. So, I can create a Solicited Node Multicast Address…
Address Resolution
NDP Neighbor Solicitation Message
Destination: Solicited-node Multicast
“Whoever has 2001:DB8:AAAA:1::200 send me your Ethernet MAC address”
2001:DB8:AAAA:1::200
FF02::1:FF00:200
PC-2
2001:DB8:AAAA:1::100
PC-1
MAC: D2-8C-E0-4C
33-33-FF
Ethernet
IPv6 Header
ICMPv6
Destination IPv6
FF02::1FF00:200
Source IPv6
2001:DB8:AAAA:1
::100
Target IPv6
2001:DB8:AAAA:1
::200
So, I can create a Solicited Node Multicast Address…

120. So, I can create a Solicited Node MAC Address…
Address Resolution
NDP Neighbor Solicitation Message
Destination: Solicited-node Multicast
“Whoever has 2001:DB8:AAAA:1::200 send me your Ethernet MAC address”
2001:DB8:AAAA:1::200
FF02::1:FF00:200
PC-2
2001:DB8:AAAA:1::100
PC-1
MAC: D2-8C-E0-4C
33-33-FF
Ethernet
IPv6 Header
ICMPv6
Dest. MAC
33-33-FF
Source MAC A
Destination IPv6
FF02::1FF00:200
Source IPv6
2001:DB8:AAAA:1
::100
Target IPv6
2001:DB8:AAAA:1
::200
So, I can create a Solicited Node MAC Address…

121. Address Resolution NIC: That’s one of my solicited node MAC addresses.
IPv6: That’s one of my solicited node addresses.
NDP Neighbor Solicitation Message
Destination: Solicited-node Multicast
“Whoever has 2001:DB8:AAAA:1::200 send me your Ethernet MAC address”
2001:DB8:AAAA:1::200
FF02::1:FF00:200
PC-2
2001:DB8:AAAA:1::100
PC-1
MAC: D2-8C-E0-4C
33-33-FF
Ethernet
IPv6 Header
ICMPv6
Dest. MAC
33-33-FF
Source MAC A
Destination IPv6
FF02::1FF00:200
Source IPv6
2001:DB8:AAAA:1
::100
Target IPv6
2001:DB8:AAAA:1
::200

122. Address Resolution
NIC: That’s one of my solicited node MAC addresses.
IPv6: That’s one of my solicited node addresses.
NDP Neighbor Solicitation Message
Destination: Solicited-node Multicast
“Whoever has 2001:DB8:AAAA:1::200 send me your Ethernet MAC address”
2001:DB8:AAAA:1::200
FF02::1:FF00:200
PC-2
2001:DB8:AAAA:1::100
PC-1
MAC: D2-8C-E0-4C
33-33-FF
Ethernet
IPv6 Header
ICMPv6
Dest. MAC
33-33-FF
Source MAC A
Destination IPv6
FF02::1FF00:200
Source IPv6
2001:DB8:AAAA:1
::100
Target IPv6
2001:DB8:AAAA:1
::200
Possible that multiple devices may have the same last 24 bits in their IPv6 address but only those devices would have to process up to the target.

123. PC-2 replies with it’s MAC address (Neighbor Advertisement Message)
Address Resolution
NIC: That’s one of my solicited node MAC addresses.
IPv6: That’s one of my solicited node addresses.
NDP Neighbor Solicitation Message
Destination: Solicited-node Multicast
“Whoever has 2001:DB8:AAAA:1::200 send me your Ethernet MAC address”
2001:DB8:AAAA:1::200
FF02::1:FF00:200
PC-2
2001:DB8:AAAA:1::100
PC-1
MAC: D2-8C-E0-4C
33-33-FF
Ethernet
IPv6 Header
ICMPv6
Dest. MAC
33-33-FF
Source MAC A
Destination IPv6
FF02::1FF00:200
Source IPv6
2001:DB8:AAAA:1
::100
Target IPv6
2001:DB8:AAAA:1
::200
PC-2 replies with it’s MAC address (Neighbor Advertisement Message)
More in ICMPv6 presentation!

124. Use of solicited-node multicasts with addressing resolution and DAD
Address Resolution
NDP Neighbor Solicitation Message
Destination: Solicited-node Multicast
“Whoever has the IPv6 address 2001:DB8:AAAA:1::200 please send me your Ethernet MAC address”
Similar to ARP in IPv4
Duplicate Address Detection (DAD)
NDP Neighbor Solicitation Message
Destination: Solicited-node Multicast
“Before I use this address is anyone else on this link using this link-local address:
FE80::50A5:8A35:A5BB:66E1?”
Similar to gratuitous ARP in IPv4

125. Solicited Node Multicast Address
Find out solicited Node Multicast Address for the following IPv6 address
2001:DB8:CAFE:1::100
3001::1
FE80::1
FF02::1:FF00:100
FF02::1:FF00:1

126. Live Demo
sh ipv6 int f0/0 sh ipv6 neighbors See Wireshark capture 4a and 4b for comparison with IPv4 ARP and Gratuitous ARP operations.

127. To summarize…

128. Stateless Autoconfiguration
Global Unicast Address Assignment
Global Unicast
Manual
Dynamic
IPv6 Unnumbered
Stateless Autoconfiguration
IPv6 Address
DHCPv6
Static
EUI-64

129. IPv6 Address Types Note: There are no broadcast addresses in IPv6
IPv6 Addressing
Unicast
Multicast
Anycast
Assigned
Solicited Node
FF00::/8
FF02::1:FF00:0000/104
Unspecified
Embedded IPv4
Global Unicast
Link-Local
Loopback
Unique Local
2000::/3
3FFF::/3
FE80::/10
FEBF::/10
::1/128
::/128
FC00::/7
FDFF::/7
::/80
Note: There are no broadcast addresses in IPv6