HP VPN Firewall Appliances Network Management Configuration Guide

Configuring 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 "Managing interfaces."

For the IPv6 address config

uration, see "Configuring basic IPv6 settings."

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.

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 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 Figure 10. The shaded areas represent the address

class. The f

irst three classes are widely used.

Figure 10 IP address classes