Chapter 3. Fundamentals
This chapter describes the fundamental logical objects which make up a NetDefendOS
configuration. These objects include such items as IP addresses and IP rules. Some exist by default
and some must be defined by the administrator.
In addition, the chapter explains the different interface types and explains how security policies are
constructed by the administrator.
• The Address Book, page 89
• IPv6 Support, page 94
• Services, page 100
• Interfaces, page 108
• ARP, page 128
• IP Rules, page 137
• Schedules, page 148
• Certificates, page 150
• Date and Time, page 156
• DNS, page 163
3.1. The Address Book
3.1.1. Overview
The NetDefendOS Address Book contains named objects representing various types of IP addresses,
including single IP addresses, networks as well as ranges of IP addresses.
Using address book objects has a number of important benefits:
• It increases understanding of the configuration by using meaningful symbolic names.
• Using address object names instead of entering numerical addresses reduces errors.
• By defining an IP address object just once in the address book, changing the definition
automatically also changes all references to it.
3.1.2. IP Addresses
IP Address objects are used to define symbolic names for various types of IP addresses. Depending
on how the address is specified, an IP Address object can represent either a single IP address (a
specific host), a network or a range of IP addresses.
In addition, IP Address objects can be used for specifying the credentials used in user
authentication. For more information about this topic, see Chapter 8, User Authentication.
The following list presents the various types of addresses an IP Address object can hold, along with
what format that is used to represent that specific type:
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