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Appendix B • The Internet and the DW4020
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10.0.0.0 - 10.255.255.255 (10/8 prefix)
172.16.0.0 - 172.31.255.255 (172.16/12 prefix)
192.168.0.0 - 192.168.255.255 (192.168/16 prefix)
The first block is the "24-bit block," the second is the "20-bit
block," and to the third is "16-bit" block. Note that the first block
is nothing but a single class A network number, while the second
block is a set of 16 contiguous class B network numbers, and
third block is a set of 256 contiguous class C network numbers.
An enterprise that decides to use IP addresses out of these address
spaces can do so without any coordination with IANA or an
Internet registry. The address space can thus be used by many
enterprises. Addresses within this private address space will only
be unique within the enterprise, or the set of enterprises which
choose to cooperate over this space so they may communicate
with each other in their own private internet. An enterprise that
requests IP addresses for its external connectivity will never be
assigned addresses from the blocks defined above.
Private IP addressing and
DW4020 customers
DW4020 customers who use private addressing must install a
router or switch between the DW4020 and their network. They
will also need to provide the installer with the LAN Gateway
address and, if applicable, the LAN subnet mask (see
Configuring
the Gateway host in Chapter 3 ).