IPv6 addressing

What is a dual-stack device?

Device running both IPv4 and IPv6

How many bits in a MAC address?

48 bits

How many bits in an IPv4 address?

32 bits

How many bits in an IPv6 address?

128 bits

Global unicast range

2000::/3 to 3FFF::/3

Link local range

FE80::/10 to FEBF::/10

Multicast address

FF00::/8

Global unicast, link local and multicast IPv6 addresses start with what 3 binary values?

Global unicast - 001
Link local & multicast - 111

Compare IPv4 and IPv6 header fields, what fields are not changed, what fields are renamed and what field is unique to IPv6?

Fields not changed:

-Version field
-Source and Destination Addresses fields

Renamed fields:

-Total length (IPv4) to Payload length (IPv6)
-Header length (non-existent in IPv6 since header length is fixed)
-Time of service (IPv4) to Traffic class (IPv6)
-Time to live (IPv4) to Hop limit (IPv6)
-Identification, Flags, and Fragment Offset (IPv4) to Fragmentation Extension Header

Fields unique to IPv6:

-Flow label

Options for configuring IPv6 addresses

1. I have everything you need. (STATEFUL)

2. I have mostly what you need, but you will need to contact a DHCPv6 server for other information like a DNS address. (STATEFUL)

3. I have nothing for you. Contact a DHCPv6 server. (STATELESS)

How is the interface ID is configured using EU-64 method?

Split the interface ID evenly in two and add FF:FE in the middle. Then, convert the first 8 bits to binary and flip the 7th bit. (1 to 0, 0 to 1)

Why do we use solicited node multicast address?

Used as a destination address when don’t know the unicast address.

Solicited Node Multicast address for link local address

Take FF02::1:FF and add the last 6 hex values of the link-local address to it.

Solicited node multicast address from global unicast address

add fe80::1