l2 changes

IPv6 Address Structure

• :: can be used once to represent a string of zeroes

• From Zytrax: link IPv6 10

IPv6 - IPv4 Addresses

• A hybrid format may be used when dealing with IPv6 - IPv4 addresses where the normal IPv4 dotted decimal notation may be used after the first 6, 16 bit address elements:

Examples

Multiple Addresses

• Note: Interfaces normally have two addresses, or even more– Link-local FE80::w.x.y.z

– Global unicast

• Used by Ethernet

Example

Interface MAC 00-40-63-ca-9a-20

IPv6 Interface ID (EUI-64)

::0040:63FF:FECA:9A20

or

::40:63FF:FECA:9A20

link local

FE80::40:63FF:FECA:9A20

IPv4 and IPv6 Header Comparison

Fragment Offset

Flags

Total LengthType of Service

IHL

PaddingOptions

Destination Address

Source Address

Header ChecksumProtocolTime to Live

Identification

Version

IPv4 Header

Next Header

Hop Limit

Flow LabelTraffic Class

Destination Address

Source Address

Payload Length

Version

IPv6 Header

Field’s Name Kept from IPv4 to IPv6

Fields Not Kept in IPv6

Name and Position Changed in IPv6

New Field in IPv6

Leg

end

AAAA Records in DNS

• iana.org and ipv6.net work too

• In CNIT 202E - Link IPv6 1

IPv6 Address Types

IPv6 Address Types

IPv6 Address Types

• From ICANN (Link L2a)

90% of this talk is stolen

• I got it here– CNIT 202E, link IPv6 8