This document provides an overview of IPv4 and IPv6. It discusses that IPv4 uses 32-bit addresses and is running out of available addresses, while IPv6 uses 128-bit addresses providing vastly more address space. IPv6 was developed to replace IPv4 and improves on areas like security, quality of service, and mobility. The document compares features of IPv4 and IPv6 such as address syntax, header fields, and configuration methods.

1. Ipv4 Over Ipv6
PRESENTATION BY:
JIGAR M. TARSARIYA
7 TH S E M E S T E R
M.SC(IT) PROGRAMME
ROLL NO: 95

2. What Is IP?
 Used for communicating data across a packet-switched
internetwork.
 Also referred to as TCP/IP.
 Primary Protocol of delivering distinguished protocol datagrams
(packets).
 The First Major Version is Ipv4.

3. Ipv4
 The fourth version of the Internet Protocol (IP) and it is the first
version of the protocol to be widely deployed.
 It uses a 32 bit addressing and allows for 4,294,967,296 unique
addresses.
 Version 4 of IP was the first that was widely used in modern
TCP/IP.
 Ipv4 is still the dominant protocol of the Internet.

4. Ipv6
 Is a version of the Internet Protocol (IP) intended to succeed




IPv4.
Is the protocol currently used to direct almost all Internet
traffic.
Also known as Ipng (IP next generation) is the second version of
the Internet Protocol to be used generally across the virtual
world.
IPng was designed to take an evolutionary step from IPv4.
Functions which work in IPv4 were kept in IPng. Functions
which didn’t work were removed.

5. Ipv6 Contd…
 Like IPv4, IPv6 is an internet-layer protocol for packet switched




internetworking and provides end-to-end datagram
transmission across multiple IP networks.
IPv6 uses 128-bit addresses, for an address space of 2^128
(approximately 3.4×1038) addresses.
It allows more devices and users then the Ipv4 on the internet.
It also allows extra flexibility in allocating addresses and
efficiency for routing traffic.
It also eliminates the primary need for network address
translation (NAT).

6. Limitations of Ipv4
 Since the 1980s it has been apparent that the number of available
IPv4 addresses is being exhausted at a rate that was not initially
anticipated in the design of the network.
 IPV4 addresses are being consumed at an alarming rate and it is
estimated that 2010 would be the last year for IPV4, some sources
say they may last until 2012.
 Primary reason for IPV4 exhaustion is huge growth in number of
internet users, mobile devices using Internet connection and always
on devices such as ADSL modems and cable modems. This brings us
to the development and adoption of IPV6 as an alternate solution.

7. Why not Ipv5?
 IP Version 4 to be called IP Version 5, but as it turned out
Version 5 of the Internet Protocol Family was already taken.
 In the late 1980s the Internet Protocol itself was the topic of a
considerable level of research, as researchers experimented with
different forms of network behavior.
 Version 5 of the Internet Protocol was reserved for use with an
experimental IP protocol, the Internet Stream Protocol, Version
2 (ST-II), written up as RFC 1190 in 1990.

8. Ipv5 Contd…
 So, When it came time to assign a protocol number of the “next
generation” of IPv4, the next available version number was 6,
hence IPv6.
 So the technical plan to address the address-exhaustion
problem was to perform an upgrade of the Internet and convert
the Internet from IP Version 4 to IP Version 6.

9. What will Ipv6 do?
 IPv6 is technology with a main focus on changing the structure
of current IP addresses, which will allow for virtually unlimited
IP addresses.
 The current version, IPv4 is a growing concern with the limited
IP addresses, making it a fear that they will run out in the
future.
 IPv6 will also have a goal to make the Internet a more secure
place for browsers, and with the rapid number of identity theft
victims, this is a key feature.

10. Ipv6 Header
 Data packet comprises of two main parts:
(1) The header and (2) The payload
 The first 40 bytes/octets (40x8 = 320 bits) of an IPv6 packet
comprise of the header (see Figure 1) that contains the following
fields:

11. Ipv6 Header Contd…
1.
2.
3.
4.
5.
6.
7.
8.
Source address (128 bits)
Destination address (128 bits)
Version/IP version (4-bits)
Packet priority/Traffic class (8 bits)
Flow Label/QoS management (20 bits)
Payload length in bytes(16 bits)
Next Header (8 bits)
Time To Live (TTL)/Hop Limit (8 bits)

12. Ipv6 Addressing
1. The Ipv6 Address Space:
 The most obvious distinguishing feature of IPv6 is its use of
much larger addresses.
 The size of an address in IPv6 is 128 bits, which is four times
the larger than an IPv4 address.
 A 128-bit address space allows for 2128 or
340,282,366,920,938,463,463,374,607,431,768,211,456 (or
3.4^1038 or 340 undecillion) possible addresses.
 The IPv6 addressing architecture is described in RFC 4291.

13. Ipv6 Addressing Contd…
2. IPv6 Address Syntax:
 IPv6, the 128-bit address is divided along 16-bit boundaries,
and each 16-bit block is converted to a 4-digit hexadecimal
number and separated by colons.
 The resulting representation is called colon-hexadecimal.
 The following is an IPv6 address in binary form:
001000000000000100001101101110000000000000000000
0010111100111011000000101010101000000000111111111111111
0001010001001110000

14. Ipv6 Addressing Contd…
 The 128-bit address is divided along 16-bit boundaries:
0010000000000001 0000110110111000
0000000000000000 0010111100111011 0000001010101010
0000000011111111 1111111000101000
1001110001011010
 Each 16-bit block is converted to hexadecimal and delimited
with colons. The result is:
2001:0DB8:0000:2F3B:02AA:00FF:FE28:9C5A

15. Ipv6 v/s Ipv4
 The following table compares the key characters of IPv6 vs. IPv4:
Subjects
Ipv4
Ipv6
Ipv6 Advantages
Address Space
4 Billion Addresses
2^128
79 Octillion times the
IPv4 address space
Configuration
Manual or use DHCP
Universal Plug and Play
(UPnP) with or without
DHCP
Lower Operation
Expenses and reduce
error
Broadcast / Multicast
Uses both
No broadcast and has
different forms of
multicast
Better bandwidth
efficiency

16. Ipv6 v/s Ipv4 Contd…
Subject
Ipv4
Ipv6
Ipv6 Advantages
Anycast support
Not part of the original
protocol
Explicit support of
anycast
Allows new applications
in mobility, data center
Network Configuration
Mostly manual and
labor intensive
Facilitate the renumbering of hosts and
routers
Lower operation
expenses and facilitate
migration
QoS support
ToS using DIFFServ
Flow classes and flow
labels
More Granular control
of QoS
Security
Uses IPsec for Data
packet protection
IPsec becomes the key
technology to protect
data and control
packets
Unified framework for
security and more
secure computing
environment

17. Ipv6 v/s Ipv4 Contd…
Subject
Ipv4
Ipv6
Ipv6 Advantages
Mobility
Uses Mobile IPv4
Mobile IPv6 provides
fast handover, better
router optimization and
hierarchical mobility
Better efficiency and
scalability; Work with
latest 3G mobile
technologies and
beyond.

18. Difference Between Ipv4 & Ipv6
 Ipv4:
 Source and destination addresses are 32 bits (4 bytes) in length.
 IPSec support is optional.
 IPv4 header does not identify packet flow for QoS handling by routers.
 Both routers and the sending host fragment packets.
 Header includes a checksum.
 Header includes options.
 Address Resolution Protocol (ARP) uses broadcast ARP Request frames
to resolve an IP address to a link-layer address.

19. Difference Between Ipv4 & Ipv6 Contd…
Ipv4:
 ICMP Router Discovery is used to determine the IPv4 address of the
best default gateway, and it is optional.
 Broadcast addresses are used to send traffic to all nodes on a subnet.
 Must be configured either manually or through DHCP.
 Uses host address (A) resource records in Domain Name System
(DNS) to map host names to IPv4 addresses.
 Uses pointer (PTR) resource records in the IN-ADDR.ARPA DNS
domain to map IPv4 addresses to host names.
 Must support a 576-byte packet size (possibly fragmented).

20. Difference Between Ipv4 & Ipv6 Contd…
 Ipv6:
 Source and destination addresses are 128 bits (16 bytes) in length.
 IPSec support is required.
 IPv6 header contains Flow Label field, which identifies packet flow



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for QoS handling by router.
Only the sending host fragments packets; routers do not.
Header does not include a checksum.
All optional data is moved to IPv6 extension headers.
Multicast Neighbor Solicitation messages resolve IP addresses to
link-layer addresses.

21. Difference Between Ipv4 & Ipv6 Contd…
Ipv6:
 ICMPv6 Router Solicitation and Router Advertisement messages are
used to determine the IP address of the best default gateway, and
they are required.
 IPv6 uses a link-local scope all-nodes multicast address.
 Does not require manual configuration or DHCP.
 Uses host address (AAAA) resource records in DNS to map host
names to IPv6 addresses.
 Uses pointer (PTR) resource records in the IP6.ARPA DNS domain to
map IPv6 addresses to host names.
 Must support a 1280-byte packet size (without fragmentation).

22. Potential Benefits and Uses of Ipv6
Increased Address Space
2. Purported Security Improvements
3. End User Application
4. Network Evolution
1.

23. References
 www.google.com
 www.wikipedia.com
 www.ipv6.com
 www.seminarforyou.com