IPv6 Basics and Address Notation
Link Local Addresses
-The second half of a full IPv6 address (64 bits)
-Link local addresses start with fe80.
-Full 128-bit IPv6 addresses are 128 bits long
-The first half is the Network Number, given by the nearest router upon boot
Address Shortening Rules
1. Leading zeros can be dropped, eg. :0223: becomes :223:
2. Continuous groups of four zeros can be abbreviated as :: , eg. :0000:0000:0000: becomes ::
3. But you can only do 2 once.
4. All CIDRs are /64
5. IPv6 loopback is ::1
No more broadcast in IPv6. You can multicast to all nodes (think all computers) at ff02::1
or all routers at ff02::2 (this is the address our NIC cries out to, to join an IPv6 network)
There’s not much like it in IPv4. In IPv6, it allows several systems to share the same address. Thus anyone anywhere can ask for that address, and automatically connect to the nearest system.