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Benefits of IPV6
Security Support Mandatory
Global Multicast Support
Fixed Extendable Header
No Packet Fragmentation
IPv6 uses a 128 bit address space
That is about 340,282,366,920,938,000,000,000,000,000,000,000,000 addresses
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
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
Long strings of zeros may be shortened with :: (you can only substitute once in an address!)
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
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
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