Saturday, November 28, 2009

RFC 4291 (IPv6 Addressing Architecture)

Just finished reading RFC4291. Brief Summary:

* IPv6 Addr Types: Unicast, Anycast, Multicast
* ::/128 - unspecified
* ::1/128 - loopback
* ff00::/8 - multicast
* fe80::/10 - link-local
* everything else is global unicast
* Can strip leading 0's and a single multiple group of 0's

* Unicast has this general format:

| n bits | m bits | 128-n-m bits |
+------------------------+-----------+----------------------------+
| global routing prefix | subnet ID | interface ID |
+------------------------+-----------+----------------------------+


* Multicast:
* prefix: ff
* all nodes: ff0{1/2}::2
* all routers: ff0{1/2/5}::2
* solicited-node: ff02::1:ffxx:xxxx

For me personally, this section had the most information that I needed help with, refer to 2.7. Multicast Addresses for more information.

* Required IPv6 addresses:
* subnet-router anycast: allows node to communicate with subnets router
* link-local
* loopback
* all-nodes multicast
* solicited-node multicast
* all-routers
* any additional anycast or unicast addresses assigned

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