42
provide the Subnet ID, and then
it
will automatically appended
with the Host
ID.
To
generate Host
ID or also called as Inte rface
Identifiers,
hosts can be
ge nerated
from
their
MAC
address.
While
MAC
address
is
only
48-bit
length
and
Host
ID
is
64-bit
length, there is a conversion method that is called Extended Unique Identifier (EUI-64).
Next,
to assign the
network ID, they depend on whether it is a stateful autoconfiguration,
or a stateless configuration.
If it was a stateful configuration, DHCP server will
automatically assign it
is IP address. On the other hand, if it was a stateless configuration
address, the
server
will send a routing advertisement that basically advertises the network
ID.
Finally,
the
host
ID
will
be
appended
to
the
network
ID.
Here
is
an
example
of
a
router advertisement protocol in OpenBSD running software called rtadvd.
fxp0:\
:addr="2001:328:2002:f107::":prefixlen#64:tc=default:
The configuration basically states that it will send router advertisement messages that use
the
network ID of 2001:328:2002:f107/64.
Later on, the clients
will
append the address
of 2001:328:2002:f107:: to their Interface ID.
2.4.3.4 DHCP
Dynamic
Host
Configuration
Protocol
(DHCP)
is
a
technique
to
automatically
assign
a
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