Motivation Address Space Address Notation Address Scope Address Types Unicast Addresses Anycast Addresses Multicast Addresses Resources About Me Compression ToolUnicast Addresses
There are several forms of unicast address assignment in IPv6:
- Global provider based unicast address
- Aggregatable global unicast address
- Neutral-interconnect unicast address
- NSAP Address
- IPX hierarchical address
- Site-local address
- link-local Address
- IPv4-capable host address
Provider Based Unicast Addresses:
Provider based unicast addresses are used for global communication. They are similar
In function to IPv4 addresses under CIDR. Their format is:
The first 3 bits(FD 010) identify the address as provider. The next field (Registry Id) identifies the internet address registry that assigns provider identifiers (Provider Id) to internet service providers, which then assign portions of the address space to subscribers.
This usage is similar to assignment of IP addresses under CIDR. The Subscriber Id distinguishes among multiple subscribers attached to the internet service provider identified by the Provider Id. The Subnet Id identifies a specific physical link.
The Interface Id identifies a single interface among the group of interfaces identified by subnet prefix.
Aggregatable global Unicast Address:
Local-Use Unicast Address:
There are two types of local-use unicast address defined -
Link-local:
The Link-Local addresses format:
Link-Local address are designed to be used for addressing on a single link.
Site-local:
The Site-Local addresses format:
Site-local address are designed to be used for addressing inside of a site
Without the need for a global prefix.
Routers must not forward any packets with site-local source or destination
Address outside of the site.