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17 terms

IPV6

STUDY
PLAY
Need for IPV6
Address Exhaustion
Protocol Security
Multicast Traffic
Benefits of IPV6
More Addresses
Security Support Mandatory
Global Multicast Support
No Broadcasts
Mobility
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!
Mobility
IPv6 has the ability for entire subnets to move from one router to another router without needing address re-assignment
TTL
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
MTU
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
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
Anycast
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
Multicast
When a packet is sent to a multicast address the packet is delivered to all hosts that are assigned that multicast address
Link-Local
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