ZyXEL VES1724-56 User Guide - Page 81
Global Address, Unspecified, EUI-64, Stateless Autoconfiguration
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Chapter 8 Basic Setting Table 13 Link-local Unicast Address Format 1111 1110 10 10 bits 0 54 bits Interface ID 64 bits 8.6.6 Global Address A global address uniquely identifies a device on the Internet. It is similar to a "public IP address" in IPv4. A global unicast address starts with a 2 or 3. The global address format as follows. Table 14 Global Address Format 001 3 bits Global ID 45 bits Subnet ID 16 bits Interface ID 64 bits The global ID is the network identifier or prefix of the address and is used for routing. This may be assigned by service providers. The subnet ID is a number that identifies the subnet of a site. 8.6.7 Unspecified An unspecified address (0:0:0:0:0:0:0:0 or ::) is used as the source address when a device does not have its own address. It is similar to "0.0.0.0" in IPv4. 8.6.8 EUI-64 The EUI-64 (Extended Unique Identifier) defined by the IEEE (Institute of Electrical and Electronics Engineers) is an interface ID format designed to adapt with IPv6. It is derived from the 48-bit (6byte) Ethernet MAC address as shown next. EUI-64 inserts the hex digits fffe between the third and fourth bytes of the MAC address and complements the seventh bit of the first byte of the MAC address. See the following example. MAC 00 : 13 : 49 : 12 : 34 : 56 EUI-64 02 : 13 : 49 : FF : FE : 12 : 34 : 56 8.6.9 Stateless Autoconfiguration With stateless autoconfiguration in IPv6, addresses can be uniquely and automatically generated. Unlike DHCPv6 (Dynamic Host Configuration Protocol version six) which is used in IPv6 stateful autoconfiguration, the owner and status of addresses don't need to be maintained by a DHCP server. Every IPv6 device is able to generate its own and unique IP address automatically when IPv6 is initiated on its interface. It combines the prefix and the interface ID (generated from its own Ethernet MAC address, see Interface ID and EUI-64) to form a complete IPv6 address. When IPv6 is enabled on a device, its interface automatically generates a link-local address (beginning with fe80). VES1724-56 User's Guide 81