F3726, F3211, F3174, R5135, R3816-HP Firewalls and UTM Devices Network Management Configuration Guide-6PW100

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3BConfiguring IPv4 addresses
The IPv4 address configuration can be configured 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 "Configuring interface management."
For the IPv6 address configuration, see "Configuring IPv6 basics."
This chapter describes IP addressing basic and manual IP address assignment for interfaces. Dynamic IP
address assignment (BOOTP and DHCP) and PPP address negotiation are beyond the scope of this
chapter.
66B
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.
380BIP address classes
Each IP address breaks down into the following 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, as shown in
2158HFigure 10. The shaded areas represent the address
class. The first three classes are widely used.
Figure 10 IP address classes
Table 3 IP address classes and ranges
Class Address ran
g
e Remarks
A
0.0.0.0 to
127.255.255.255
The IP address 0.0.0.0 is used by a host at startup for temporary
communication. This address is never a valid destination address.
Addresses starting with 127 are reserved for loopback test.
Packets destined to these addresses are processed locally as input
packets rather than sent to the link.