IPv6 Auto address assignment
Digi TransPort WR Routers User Guide
68
Address type Beginning characters Description
Link local addresses fe80 Each device auto-
generates a link-local
address on every
interface using IPv6.
The interfaces use
these addresses to
communicate with
other devices
connected on the link.
Multicast addresses ff Addresses for sending
packets to a group of
devices. There are a
number of well-known
defined addresses,
such as those for All
nodes and All routers.
Unique local addresses (ULA) fc or fd Addresses for creating
a site-specific network.
While these addresses
are globally unique, you
cannot use them for
routing on the Internet.
Auto address assignment
There are three modes in which a device can auto-configure itself with an IPv6 address and other
network configuration. The mode the device uses is controlled by the Router Advertisement messages
a router periodically sends out, or in response to a Router Solicitation message that a host sends.
Auto-configuration mode Description
Stateless auto-configuration (SLAAC) The device uses the prefix sent in the
Router Advertisement message to
generate a unique IPv6 usually by
appending the interface’s MAC address
with EUI-64 encoding. The device can
also learn gateway and DNS server
information from the Router
Advertisement message. The device
uses Duplicate Address Detection (DAD)
to ensure the auto-generated IPv6
address is unique.
DHCPv6 The device uses DHCPv6 to get an IPv6
address and other network
configuration.
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