ipv6 overview - apnic€¦ · ipv6 header hop-by-hop options header destination options header...

22 v1.0

IPv6 OverviewW E B I N A R C O U R S E

2

3 v1.03

Overview

• Global IPv6 End-User Readiness

• IPv6 Packet Header Format

• Introduction of IPv6 Extension Headers

• IPv6 Address Representation

• Overview of IPv6 Address Types

• Homework

4 v1.04

Global IPv6 End-User Readiness

Source: https://stats.labs.apnic.net/ipv6/ (20200602)

Results are generated from the samples collected by APNIC Lab from Internet.

https://stats.labs.apnic.net/ipv6/

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Global IPv6 End-User Readiness



6 v1.06

IPv6 End-User Readiness in Asia



7 v1.07

IPv6 End-User Readiness in Oceania



8

IPv6 Packet Header FormatIPv6 Overview

9 v1.09

IPv6 is Network Layer Replacement of IPv4

Application Layer

Transport Layer

Network Layer

Datalink Layer

IPv4 IPv6

32 bit 128 bit

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Comparison of IPv6 and IPv4 Packet Headers

I P v 6 H e a d e r

8200

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I P v 6 H e a d e r

791

I P v 4 H e a d e r

8200

12 v1.012


I P v 6 H e a d e r

791

I P v 4 H e a d e r

8200

Keep the same name -- 3 parts

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I P v 6 H e a d e r

791

I P v 4 H e a d e r

8200

Keep the same name -- 3 partsDifferent names with similar functions -- 4 parts

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I P v 6 H e a d e r

791

I P v 4 H e a d e r

8200

Keep the same name -- 3 partsDifferent names with similar functions -- 4 partsNew function – 1 part

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IPv6 & IPv4 Packet Example

• Example IPv6 packet on this link:

• https://www.cloudshark.org/captures/84fd54ad03e0

• Example IPv4 packet on this link:

• https://www.cloudshark.org/captures/09f49cda5b80

https://www.cloudshark.org/captures/84fd54ad03e0

https://www.cloudshark.org/captures/09f49cda5b80

16

Introduction of IPv6 Extension HeadersIPv6 Overview

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What is an Extension Header?

IPv6 Packet

18 v1.018


IPv6 Packet

Upper-layer Example:TCP Segment

IPv6 Header

Optional internet-layer information, such as, fragmentation information, encryption, etc.

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IPv6 Packet

Upper-layer Example:TCP Segment

IPv6 Header

Extension Headers

Optional internet-layer information, such as, fragmentation information, encryption, etc.

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IPv6 Packet

IP

v6

H

ea

de

r

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IPv6 Packet

Maybe the payload is the TCP segment.

IP

v6

H

ea

de

rPa

yloa

d

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IPv6 Extension Header

IP

v6

H

ea

de

r

TCP Segment

Extension HeaderMaybe the payload is composed of an extension header and the TCP segment.

Payl

oad

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IPv6 Extension Headers

TCP Segment

Extension Header 2

Extension Header 1

IP

v6

H

ea

de

r

Maybe the payload is composed of 2 extension headers and the TCP segment.P

ay

loa

d

2424 v1.0

Maybe the payload is composed of several extension headers and the TCP segment.

TCP Segment

Extension Header 2

Extension Header 1

Extension Header 4

Extension Header 3

IP

v6

H

ea

de

rP

ay

loa

d

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Extension Header Types

Extension HeaderHop-by-Hop Options RoutingFragmentDestination OptionsAuthenticationEncapsulating Security Payload

• Following are the extension header types listed in RFC 8200:

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Extension Header Types and Type Value

Extension Header Type ValueHop-by-Hop Options 0Routing 43Fragment 44Destination Options 60Authentication 51Encapsulating Security Payload 50

• Following are the extension header types listed in RFC 8200:

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Extension Header Example

• Example IPv6 packet with an Extension Header on this link:

• https://www.cloudshark.org/captures/7dd0b50eb768

• https://www.cloudshark.org/captures/90fd94cba716

What is the type of extension header in each of the packets?

https://www.cloudshark.org/captures/7dd0b50eb768

https://www.cloudshark.org/captures/90fd94cba716

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Extension Header Example

• Example IPv6 packet with an Extension Header on this link:

• https://www.cloudshark.org/captures/7dd0b50eb768

• https://www.cloudshark.org/captures/90fd94cba716

What is the type of extension header in each of the packets?

Fragment Header

Hop-by-Hop Options Header

https://www.cloudshark.org/captures/7dd0b50eb768

https://www.cloudshark.org/captures/90fd94cba716

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Extension Header Order

• When more than one extension header is used in the same packet, it is recommended that those headers appear in the following order in RFC 8200:

TCP Segment

IPv6 Header

Extension Headers

IPv6 header

Hop-by-Hop Options header

Destination Options header

Routing header

Fragment header

Authentication header (RFC 4302)

Encapsulating Security Payload header (RFC 4303)

Destination Options header

TCP header (Upper-Layer header)

IPv6 Packet

30

IPv6 Address RepresentationIPv6 Overview

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IPv6 Address Format

IPv6 address is represented in hexadecimal.

Example: 2001:0db8:0000:0000:0000:036e:1250:2b00

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IPv6 Address Format


Example: 2001:0db8:0000:0000:0000:036e:1250:2b001 2 3 4 5 6 7 8

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IPv6 Address Format


Example:

Binary format (128-bit):

2001:0db8:0000:0000:0000:036e:1250:2b00

0010000000000001 0000110110111000 000000000000000000000011011011100000000000000000 0000000000000000

0001001001010000 0010101100000000

4 hexadecimal digits

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IPv6 Address Format

:0db8:0000:0000:0000:036e:1250:2b00

0000110110111000 000000000000000000000011011011100000000000000000 0000000000000000

0001001001010000 0010101100000000


0010000000000001

2001


Components of an IPv6 address:

Example:

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IPv6 Address Format


Example:


:0db82001: :0000:0000:036e:1250:2b000000

0000110110111000001000000000000100000011011011100000000000000000 0000000000000000

0001001001010000 0010101100000000

0000000000000000

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IPv6 Address Format


Example:


:0db82001: :0000:0000:036e:1250:2b000000

0000110110111000001000000000000100000011011011100000000000000000 0000000000000000

0001001001010000 0010101100000000

0000000000000000

Separated by colons

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IPv6 Address Format


Example: :0db8:0000:0000:0000:036e:1250:2b00

0010000000000001

2001

16 binary bits(1 x 16 bits)


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0000 0000 0001

100

IPv6 Address Format


Example: :0db8:0000:0000:0000:036e:1250:2b002


Dec Hex Binary

0 0 0000

1 1 0001

2 2 0010

3 3 0011

4 4 0100

5 5 0101

6 6 0110

7 7 0111

8 8 1000

9 9 1001

10 a 1010

11 b 1011

12 c 1100

13 d 1101

14 e 1110

15 f 1111

0010

nibble

16 binary bits

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0010

2

0000 0001

10

IPv6 Address Format


Example: :0db8:0000:0000:0000:036e:1250:2b00


Dec Hex Binary

0 0 0000

1 1 0001

2 2 0010

3 3 0011

4 4 0100

5 5 0101

6 6 0110

7 7 0111

8 8 1000

9 9 1001

10 a 1010

11 b 1011

12 c 1100

13 d 1101

14 e 1110

15 f 1111

0

0000

nibble

16 binary bits

nibble

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0000

0

0010

2

0001

1

IPv6 Address Format


Example: :0db8:0000:0000:0000:036e:1250:2b00


Dec Hex Binary

0 0 0000

1 1 0001

2 2 0010

3 3 0011

4 4 0100

5 5 0101

6 6 0110

7 7 0111

8 8 1000

9 9 1001

10 a 1010

11 b 1011

12 c 1100

13 d 1101

14 e 1110

15 f 1111

0

0000

nibble

16 binary bits

nibble nibble

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0

00000000

0

0010

2

IPv6 Address Format


Example: :0db8:0000:0000:0000:036e:1250:2b00


Dec Hex Binary

0 0 0000

1 1 0001

2 2 0010

3 3 0011

4 4 0100

5 5 0101

6 6 0110

7 7 0111

8 8 1000

9 9 1001

10 a 1010

11 b 1011

12 c 1100

13 d 1101

14 e 1110

15 f 1111

1

0001

nibble

16 binary bits

nibble nibble nibble

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IPv6 Address Format


Example: :0000:0000:0000:036e:1250:2b00

0010000000000001

32 bits(2 x 16 bits)

:0db82001

0000110110111000


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IPv6 Address Format


Example: :0000:0000:036e:1250:2b00

0010000000000001


0000110110111000

:0000:0db82001

0000000000000000


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IPv6 Address Format


Example: :0db82001: :0000:0000:036e:1250:2b000000

00001101101110000010000000000001

0000001101101110

0000000000000000

0000000000000000 0001001001010000 0010101100000000

0000000000000000


32 hexadecimal digits in 8 fields

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Quiz 1

• (Single Choice) How many fields (or parts) in a complete format of an IPv6

address?

o A. 6

o B. 16

o C. 8

o D. 10

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Quiz 1

• (Single Choice) How many fields (or parts) in a complete format of an IPv6

address?

o A. 6

o B. 16

o C. 8

o D. 10

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Omitting Leading Zeros

Example 1: 2001:0db8:0000:0000:0000:036e:1250:2b00

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Example 1:

2001:0db8:0000:0000:0000:036e:1250:2b00

2001:0db8:0000:0000:0000:036e:1250:2b00

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Example 1:

2001:db8:0:0:0:36e:1250:2b00

2001:0db8:0000:0000:0000:036e:1250:2b00

50 v1.050


Example 1:

Example 2:

2001:db8:0:0:0:36e:1250:2b00

2001:0db8:0000:0000:0000:036e:1250:2b00

2001:0db8:010d:000a:00dd:c000:e000:0001

51 v1.051


Example 1:

Example 2:

2001:db8:0:0:0:36e:1250:2b00

2001:0db8:0000:0000:0000:036e:1250:2b00

2001:0db8:010d:000a:00dd:c000:e000:0001

2001:0db8:010d:000a:00dd:c000:e000:0001

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Example 1:

Example 2:

2001:db8:0:0:0:36e:1250:2b00

2001:0db8:0000:0000:0000:036e:1250:2b00

2001:0db8:010d:000a:00dd:c000:e000:0001

2001:db8:10d:a:dd:c000:e000:1

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Example 1:

Example 2:


2001:db8:0:0:0:36e:1250:2b00

2001:0db8:0000:0000:0000:036e:1250:2b00

2001:0db8:010d:000a:00dd:c000:e000:0001

2001:db8:10d:a:dd:c000:e000:1

Trailing 0s must be included

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Double Colon “::”

• Sometimes, it is common to see the long strings of zero bits in IPv6 address. For

example, 2001:db8:0:0:0:0:0:1.

• In order to make writing addresses containing zero bits easier, “::” is available to

compress the zeros.

• The use of “::” indicates one or more groups of 16 bits of zeros.

• The “::” can only appear once in an address.

4291

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• Example 1:

2001:db8:0:0:0:36e:1250:2b00

2001:0db8:0000:0000:0000:036e:1250:2b00

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• Example 1:

2001:db8:0:0:0:36e:1250:2b00

::

2001:0db8:0000:0000:0000:036e:1250:2b00

• Compressed form:

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• Example 1:


2001:db8:0:0:0:36e:1250:2b00

2001:db8::36e:1250:2b00

2001:0db8:0000:0000:0000:036e:1250:2b00

• Compressed form:

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• Example 2: 2001:db8:0:0:0:0:0:1


2001:db8::1

• Example 3: 2001:db8:0:0:0:0:0:0

2001:db8::

Compressed form:

Compressed form:

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Recommendation of “::” Placement in RFC 5952

• When there is an alternative choice in the placement of a “::”, the longest run of

consecutive 16-bit 0 fields MUST be shortened

Example: 2001:db8:0:0:1234:0:0:0

2001:db8::1234:0:0:0

2001:db8:0:0:1234::

There are 2 compressed formats:

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• When there is an alternative choice in the placement of a “::”, the longest run of

consecutive 16-bit 0 fields MUST be shortened

Example: 2001:db8:0:0:1234:0:0:0

2001:db8::1234:0:0:0

2001:db8:0:0:1234:: RFC 5952


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• When the length of the consecutive 16-bit 0 fields are equal the first sequence of

zero bits MUST be shortened.

Example: 2001:db8:0:0:1:0:0:1

2001:db8::1:0:0:1

2001:db8:0:0:1::1


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• When the length of the consecutive 16-bit 0 fields are equal the first sequence of

zero bits MUST be shortened.

Example: 2001:db8:0:0:1:0:0:1

2001:db8::1:0:0:1

2001:db8:0:0:1::1

RFC 5952


63 v1.063

Quiz 2

• Please write the most compressed format of the following IPv6 address to its,

using the RFC 5952 standard (both omitting leading zeros and using “::”).

o 2001:0db8:0001:0000:0000:0000:fac4:00b0

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Quiz 2

• Please write the most compressed format of the following IPv6 address to its,

using the RFC 5952 standard (both omitting leading zeros and using “::”).

o 2001:0db8:0001:0000:0000:0000:fac4:00b0

• Answer: 2001:db8:1::fac4:b0

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IPv6 Prefix

An IPv6 address prefix is represented by the notation:

ipv6-address/prefix-length

Prefix-length is a decimal value specifying how many of the leftmost contiguous bits of the address comprise the prefix.

4291

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IPv6 Prefix



Example 1: 2001:db8::/32

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IPv6 Prefix



Example 1: 2001:db8::/32

Example Network

2001:db8::/32 This example network is using the IPv6 address block 2001:db8::/32.

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IPv6 Prefix



Example 1: 2001:db8::/32

Example Network

2001:db8::/32 This example network is using the IPv6 address block 2001:db8::/32.

:0000:0000:0000:

0010000000000001

32 bits

:0db82001

0000110110111000

0000:0000:0000/32

Prefix

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Overview of IPv6 Address TypesIPv6 Overview

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Overview of IPv6 Address Types

IPv6 Addressing

Unicast

Global Unicast

2000::/3

Link-Local

fe80::/10

Loopback

::1/128

Unspecified Address::/128

Unique Local

fc00::/7

Embedded IPv4::/80

Anycast Multicast

Assigned

ff00::/8

Solicited Node

ff02::1:ff00:0000/104

Figure 1: IPv6 Address Types

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IPv6 Address Types: Unicast

IPv6 Addressing

Unicast

Global Unicast

2000::/3

Link-Local

fe80::/10

Loopback

::1/128


Unique Local

fc00::/7

Embedded IPv4::/80

Anycast Multicast

Assigned

ff00::/8

Solicited Node

ff02::1:ff00:0000/104


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IPv6 Address Types: Anycast

IPv6 Addressing

Unicast Anycast Multicast

Assigned

ff00::/8

Solicited Node

ff02::1:ff00:0000/104

Global Unicast

2000::/3

Link-Local

fe80::/10

Loopback

::1/128


Unique Local

fc00::/7

Embedded IPv4::/80


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IPv6 Address Types: Multicast

IPv6 Addressing

Unicast Anycast Multicast

Assigned

ff00::/8

Solicited Node

ff02::1:ff00:0000/104

Global Unicast

2000::/3

Link-Local

fe80::/10

Loopback

::1/128


Unique Local

fc00::/7

Embedded IPv4::/80


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Link-Local IPv6 Unicast Addresses

• Link-Local addresses (fe80::/10) are for use on a single link.

Link-local Scope

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Link-Local IPv6 Unicast Addresses

fe80::1897:279d:5a41:7c8

Host1Router

fe80::c800:beff:fe5d:1c

en0

host:~user$ ifconfig

en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500ether 78:4f:43:75:83:d1inet6 fe80::1897:279d:5a41:7c8%en0 prefixlen 64 secured scopeid 0x8inet6 2001:db8:6a02:2c00:104d:7d3b:794a:6834 prefixlen 64 autoconf securedinet6 2001:db8:6a02:2c00:d186:85f0:bad0:7807 prefixlen 64 autoconf temporaryinet 10.0.0.120 netmask 0xffffff00 broadcast 10.0.0.255nd6 options=201<PERFORMNUD,DAD>media: autoselectstatus: active

en0

What does this “%en0” mean?

%en0 is the zone index for the interface en0.

Zone index helps uniquely distinguish which link/subnet an interface is connected to. The zone indices are strictly local to the device.

On Linux OS or MacOS, run ifconfig, on windows OS, run ipconfig, please check the IPv6 addresses on your computer.

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Homework

• 1. Complete a quiz and get your certificate for this webinar:

o Link: https://academy.apnic.net/en/quizz/ipv6-overview/

https://academy.apnic.net/en/quizz/ipv6-overview/

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Homework



• 2. Take the online courses “IPv6 Fundamentals” and “IPv6 Address Planning” on

APNIC Academy.

academy.apnic.net


http://academy.apnic.net/

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Homework



• 2. Take the online courses “IPv6 Fundamentals” and “IPv6 Address Planning” on

APNIC Academy.

academy.apnic.net


http://academy.apnic.net/

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Acknowledgements

• Figure 1: Adapted from Graziani, R. (2013). IPv6 Fundamentals: A Straightforward Approach to

Understanding IPv6. USA: Cisco Press, Figure 4-1. IPv6 Address Types.

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Last but not least

Wish you and your family stay safe and healthy!

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Thank You!END OF SESSIONThank You!

END OF SESSION

ipv6 overview - apnic€¦ · ipv6 header hop-by-hop options header destination options header...

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