R3721-F3210-F3171-HP High-End Firewalls Network Management Configuration Guide-6PW101

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Configuring IPv4 address
NOTE:
• The IPv4 address configuration is available in the web interface and at the CLI. This chapter only
describes the IPv4 address configuration at the CLI. For the IPv4 address configuration in the web
interface, see the chapter "Configuring interface management."
• For the IPv6 address configuration, see the chapter "Configuring IPv6 basics."
• This chapter describes IP addressin
g
basic and manual IP address assi
g
nment for interfaces. Dynamic IP
address assignment (BOOTP and DHCP) and PPP address negotiation are beyond the scope of this
chapter.
Overview
This section describes the IP addressing basics.
IP addressing uses a 32-bit address to identify each host on a network. To make addresses easier to read,
they are written in dotted decimal notation, each address being four octets in length. For example,
address 00001000000000010000000100000001 in binary is written as 10.1.1.1.
IP address classes
Each IP address breaks down into two parts:
• Net ID—Identifies a network. The first several bits of a net ID, known as the class field or class bits,,
identify the class of the IP address.
• Host ID—Identifies a host on a network.
IP addresses are divided into five classes, shown in Figure 10. The shaded ar
eas represent the address
class. The first three classes are widely used.
Figure 10 IP address classes
Table 3 describes the address ranges of these five classes.