Product manual

IPv6 : Points to Remember

1. IPv6 address is 128 bits in length represented in hexadecimal

2. IPv6 Loopback address is 0:0:0:0:0:0:0:1, also expressed as ::1.

3. IPv6 reserves two special addresses. They are 0:0:0:0:0:0:0:0 and 0:0:0:0:0:0:0:1.

4. Three transition strategies for migration from ipv6 to ipv4 are dual stacking, 6-to-4 tunneling and NAT-PT

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Cisco™ CCNA : IPv6 Addressing

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EUI-64 Format

MAC to EUI-64 conversion inserts hex “FFFE” in the middle of a MAC addr, Then flips

the U/L bit to 1, in order to create a 64-bit interface ID from a 48-bit Mac address.

IPv6 Communication Types

Unicast : used for one-to-one communication.

There are 3 types of unicast addresses namely

global, unique-local and link-local

Multicast : used for one-to-many communication

IPv6 multicast address begins with "FF"

Anycast : used for one-to-one-of-many

communication

IPv6 Address Scopes

::/0----------------> Default Route

::/128------------> Unspecified

::1/128-----------> Loopback

FC00::/7---------> Unique Local Unicast

FE80::/10--------> Link-Local Unicast

FEC0::/10-------> Site-Local Unicast

FF00::/8----------> Multicast

IPv6 Addressing

IPv6 address consists of 8 groups of four hexadecimal digits separated by colons and which mainly consists

of 3 segments called Global Prefix which is of 48 bits, subnet part with 16 bits and Interface ID called as Host

part with 64 bits.

The first 3 octets constitute Global Prefix, the fourth octet constitute subnet part and the last four form the

Interface ID.

Rules : a) One set of 0's in the address can be replaced by :: but this can be done only once

b) One or any number of consecutive groups of 0 value can be replaced with two colons (::)

IPv6 Header

Version (4 bits) : IP version number (6)

Traffic Class (8 bits) : Used for QoS

Flow Label (20 bits) : Used for packet labelling

Payload Length (16 bits) : Length of the IPv6 payload

Next Header (8 bits) : Identifies the type of header following the IPv6 header

Hop Limit (8 bits) : Number of hops until the packet gets discarded.

Source Address (128 bits) : Source IP address

Destination Address (128 bits) : Destination IP address