ZyXEL zyxel Prestige100 User Manual download pdf (Page 52)

40 Configuring for Internet Access

Figure 4-1 Internet Access

IP Addresses and the Internet

Conventionally, the Internet (with a capital I) refers the large-scale

interconnected networks across the world that was originally

developed by the US Department of Defense. The Internet uses

exclusively the TCP/IP protocols. The term “internet” (lower case

i), however, refers to any interconnected networks using any

protocol. An internet can be as simple as two hosts on a LAN, or it

can be as complex as the Internet itself.

Every machine on the Internet must have a unique address within

that internet. If your networks are isolated from the Internet, e.g.,

only between your two branch offices, you can assign any IP

addresses to the hosts without problems. However, the Internet

Assigned Numbers Authority (IANA) has reserved the following

three blocks of IP addresses specifically for private networks:

10.0.0.0 - 10.255.255.255

172.16.0.0 - 172.31.255.255

192.168.0.0 - 192.168.255.255

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ZyXEL zyxel Prestige100 User Manual Page 52