The IPv4 address in this example then is 127.14.32.1.
Nodes supporting IPv4 recognize the format of the IPv4 address and drop the preceding
portions of the address.
There are different types of IP addresses that can be used:
?– Unicast address
?– Anycast address
?– Multicast address
The unicast address is the address assigned to a device interface. This is the commonly
used address to reach a subscriber??™s IP device. An IPv6 unicast address is 132
bits in length, commonly expressed in hexadecimal format when expressed in text
strings.
When a device connects into the network, it will receive a Unicast address for the
connection. Keep in mind that in reality this identifies the connection in the network to
be used to reach the device it is assigned to. All communications intended for the device
are sent to the assigned Unicast address.
An Anycast address is used where multiple nodes need to be addressed with the same
address. A good example of this would be a P-CSCF or I-CSCF. Rather than assign
different IP addresses for each node in the network, by using Anycast addressing, an
operator can configure one address for routing to all the P-CSCF and I-CSCF functions
in the network. These would then be the addresses used by other operators to route to
the IMS. An Anycast address will only route to one node, however, despite the fact that
Subnet ID Global routing prefix Interface ID
n bits m bits 128-n-m bits
Figure 4.
Pages:
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209