L2 changes
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Transcript of 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