D-Link DFL-800-AV-12 User Manual - Page 48
Fundamentals, 3.1. The Address Book, 3.1.1. Overview, 3.1.2. IP Addresses
View all D-Link DFL-800-AV-12 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 48 highlights
Chapter 3. Fundamentals This chapter describes the fundamental logical objects upon which NetDefendOS is built. These objects include such things as addresses, services and schedules. In addition, the chapter explains how the various supported interfaces work, it outlines how secuirty policies are constructed and how basic system settings are configured. • The Address Book, page 48 • Services, page 52 • Interfaces, page 57 • ARP, page 68 • The IP Rule Set, page 73 • Schedules, page 77 • X.509 Certificates, page 79 • Setting Date and Time, page 82 • DNS Lookup, page 87 3.1. The Address Book 3.1.1. Overview The Address Book contains named objects representing various types of addresses, including IP addresses, networks and Ethernet MAC addresses. Using Address Book objects has three distinct benefits; it increases readability, reduces the danger of entering incorrect network addresses, and makes it easier to change addresses. By using objects instead of numerical addresses, you only need to make changes in a single location, rather than in each configuration section where the address appears. 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 host (a single IP address), a network or a range of IP addresses. In addition, IP Address objects can be used for specifying user credentials later used by the various user authentication subsystems. For more information on this, 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: Host IP Network A single host is represented simply by its IP address. For example: 192.168.0.14 An IP Network is represented using CIDR (Classless Inter Domain Routing) form. CIDR uses a forward slash and a digit (0-32) to denote the size of the network (netmask). /24 corresponds to a class C net with 256 addresses (netmask 255.255.255.0), /27 corresponds to a 32 address net (netmask 255.255.255.224) and so on. The numbers 0-32 correspond to the number of binary ones in the netmask. 48