TP-Link T1700X-16TS T1700X-16TSUN V1 User Guide - Page 28
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Note: Two colons (::) can be used only once in an IPv6 address, usually to represent the longest successive hexadecimal fields of zeros. If two colons are used more than once, the device is unable to determine how many zeros double-colons represent when converting them to zeros to restore a 128-bit IPv6 address. An IPv6 address consists of two parts: address prefix and interface ID. The address prefix and the interface ID are respectively equivalent to the network ID and the host ID in an IPv4 address. An IPv6 address prefix is represented in "IPv6 address/prefix length" format, where "IPv6 address" is an IPv6 address in any of the above-mentioned formats and "prefix length" is a decimal number indicating how many leftmost bits from the preceding IPv6 address are used as the address prefix. 2. IPv6 address classification IPv6 addresses fall into three types: unicast address, multicast address, and anycast address. Unicast address: An identifier for a single interface, on a single node. A packet that is sent to a unicast address is delivered to the interface identified by that address. Multicast address: An identifier for a set of interfaces (typically belonging to different nodes), similar to an IPv4 multicast address. A packet sent to a multicast address is delivered to all interfaces identified by that address. There are no broadcast addresses in IPv6. Their function is superseded by multicast addresses. Anycast address: An identifier for a set of interfaces (typically belonging to different nodes). A packet sent to an anycast address is delivered to one of the interfaces identified by that address (the nearest one, according to the routing protocols' measure of distance). The type of an IPv6 address is designated by the first several bits called format prefix. The following table lists the mappings between address types and format prefixes. Type Format Prefix (binary) IPv6 Prefix ID Unassigned address 00...0 (128 bits) ::/128 Loopback address 00...1 (128 bits) ::1/128 Link-local address Unicast address Site-local address 1111111010 1111111011 Global unicast address (currently assigned) Reserved type (to be assigned in future) 001 Other formats FE80::/10 FEC0::/10 2xxx::/4 or 3xxx::/4 17