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Need for IPV6

Address Exhaustion
Protocol Security
Multicast Traffic

Benefits of IPV6

More Addresses
Security Support Mandatory
Global Multicast Support
No Broadcasts
Simplified Routing
Fixed Extendable Header
No Packet Fragmentation
Auto Configuration

More Addresses

IPv6 uses a 128 bit address space
That is about 340,282,366,920,938,000,000,000,000,000,000,000,000 addresses

Security Support Mandatory

IPSec provides
Encrypted transport
Certificate based authentication

Global Multicast Support

IPv6 provides global multicast support. If you can route to it you can multicast to it!


IPv6 has the ability for entire subnets to move from one router to another router without needing address re-assignment


TTL is now a hop count rather than time based for simpler calculation

Simplified Routing

IPv6 uses a fixed length subnet mask. All Subnets are /64
Simplified packet header.
This facilitates efficient routing
No header checksum to calculate
-Link layer and higher layer checksums are relied upon for header integrity


Maximum transmit unit:

Path MTU Discovery
-Packet is sent using routers MTU, any router along the way that can not handle the packet sends an ICMPv6 packet to big message back with its MTU

No packet fragmentation

Routers do not fragment IPv6 Packets
Maximum packet size must be established prior to transmission

Compressing 0's

Long strings of zeros may be shortened with :: (you can only substitute once in an address!)
For example
2001:DB8:0:0:8:800:200C:417A becomes 2001:DB8::8:800:200C:417A


Unicast addresses identify a single network interface. This is the most common type of address used. And is analogous to an IPv4 address

Unicast address types

Global address
Link-local address
Unique-local address


An Anycast address is an address that is applied to more than one interface.
When a packet is routed to an Anycast address it is delivered to the first interface discovered configured with that Anycast address


When a packet is sent to a multicast address the packet is delivered to all hosts that are assigned that multicast address


Link local address are addresses that are automatically configured using the interfaces hardware address.
These addresses are not routable!
Link local address use the prefix fe80::/10

Unique Local

Unique local address are similar in nature to IPv4 private Addresses in that they are not assigned by a numbering authority, however they are probably globally unique and are routable within participating sites

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