P-662H/HW-D Series User’s Guide
390
Appendix E IP Addresses and Subnetting
The following table shows the network number and host ID arrangement for classes A, B and
C.
An IP address with host IDs of all zeros is the IP address of the network (192.168.1.0 for
example). An IP address with host IDs of all ones is the broadcast address for that network
(192.168.1.255 for example). Therefore, to determine the total number of hosts allowed in a
network, deduct two as shown next:
• A class C address (1 host octet:
8 host bits) can have 2
8
– 2, or 254 hosts.
• A class B address (2 host octets: 16 host bits) can have 2
16
– 2, or 65534 hosts.
A class A address (3 host octets: 24 host bits) can have 2
24
– 2 hosts, or approximately 16
million hosts.
IP Address Classes and Network ID
The value of the first octet of an IP address determines the class of an address.
• Class A addresses have a
0
in the leftmost bit.
• Class B addresses have a
1
in the leftmost bit and a
0
in the next leftmost bit.
• Class C addresses start with
1 1 0
in the first three leftmost bits.
• Class D addresses begin with
1 1 1 0
. Class D addresses are used for multicasting, which
is used to send information to groups of computers.
• There is also a class E. It is reserved for future use.
The following table shows the allowed ranges for the first octet of each class. This range
determines the number of subnets you can have in a network.
Table 149
Classes of IP Addresses
IP ADDRESS
OCTET 1
OCTET 2
OCTET 3
OCTET 4
Class A
Network number
Host ID
Host ID
Host ID
Class B
Network number Network number
Host ID
Host ID
Class C
Network number Network number
Network number
Host ID
Table 150
Allowed IP Address Range By Class
CLASS
ALLOWED RANGE OF FIRST OCTET (BINARY)
ALLOWED RANGE OF FIRST
OCTET (DECIMAL)
Class A
0
0000000 to
0
1111111
0 to 127
Class B
10
000000 to
10
111111
128 to 191
Class C
110
00000 to
110
11111
192 to 223
Class D
1110
0000 to
1110
1111
224 to 239
Class E
(reserved)
1111
0000 to
1111
1111
240 to 255
Содержание 802.11g ADSL 2+ 4-Port Security Gateway HW-D Series
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Страница 10: ...P 662H HW D Series User s Guide 10 Customer Support ...
Страница 24: ...P 662H HW D Series User s Guide 24 Table of Contents ...
Страница 32: ...P 662H HW D Series User s Guide 32 List of Figures ...
Страница 38: ...P 662H HW D Series User s Guide 38 List of Tables ...
Страница 64: ...P 662H HW D Series User s Guide 64 Chapter 2 Introducing the Web Configurator ...
Страница 84: ...P 662H HW D Series User s Guide 84 Chapter 4 Bandwidth Management Wizard ...
Страница 108: ...P 662H HW D Series User s Guide 108 Chapter 5 WAN Setup ...
Страница 122: ...P 662H HW D Series User s Guide 122 Chapter 6 LAN Setup ...
Страница 155: ...P 662H HW D Series User s Guide Chapter 8 DMZ 155 Figure 81 DMZ Private and Public Address Example ...
Страница 156: ...P 662H HW D Series User s Guide 156 Chapter 8 DMZ ...
Страница 188: ...P 662H HW D Series User s Guide 188 Chapter 11 Firewall Configuration Figure 97 Firewall Edit Rule ...
Страница 202: ...P 662H HW D Series User s Guide 202 Chapter 11 Firewall Configuration ...
Страница 210: ...P 662H HW D Series User s Guide 210 Chapter 12 Anti Virus Packet Scan ...
Страница 214: ...P 662H HW D Series User s Guide 214 Chapter 13 Content Filtering ...
Страница 232: ...P 662H HW D Series User s Guide 232 Chapter 14 Content Access Control ...
Страница 238: ...P 662H HW D Series User s Guide 238 Chapter 15 Introduction to IPSec ...
Страница 273: ...P 662H HW D Series User s Guide Chapter 17 Certificates 273 Figure 144 My Certificate Details ...
Страница 284: ...P 662H HW D Series User s Guide 284 Chapter 17 Certificates Figure 152 Trusted Remote Host Details ...
Страница 292: ...P 662H HW D Series User s Guide 292 Chapter 18 Static Route ...
Страница 303: ...P 662H HW D Series User s Guide Chapter 19 Bandwidth Management 303 Figure 162 Bandwidth Management Monitor ...
Страница 304: ...P 662H HW D Series User s Guide 304 Chapter 19 Bandwidth Management ...
Страница 308: ...P 662H HW D Series User s Guide 308 Chapter 20 Dynamic DNS Setup ...
Страница 332: ...P 662H HW D Series User s Guide 332 Chapter 22 Universal Plug and Play UPnP ...
Страница 338: ...P 662H HW D Series User s Guide 338 Chapter 23 System ...
Страница 344: ...P 662H HW D Series User s Guide 344 Chapter 24 Logs ...
Страница 350: ...P 662H HW D Series User s Guide 350 Chapter 25 Tools ...
Страница 363: ...P 662H HW D Series User s Guide Chapter 27 Troubleshooting 363 Figure 213 Security Setting ActiveX Controls ...
Страница 364: ...P 662H HW D Series User s Guide 364 Chapter 27 Troubleshooting ...
Страница 368: ...P 662H HW D Series User s Guide 368 Product Specifications ...
Страница 372: ...P 662H HW D Series User s Guide 372 Appendix C Wall mounting Instructions ...
Страница 408: ...P 662H HW D Series User s Guide 408 Appendix F Wireless LANs ...
Страница 420: ...P 662H HW D Series User s Guide 420 Appendix H Command Interpreter ...
Страница 436: ...P 662H HW D Series User s Guide 436 Appendix L NetBIOS Filter Commands ...
Страница 462: ...P 662H HW D Series User s Guide 462 Appendix M Internal SPTGEN ...
Страница 484: ...P 662H HW D Series User s Guide 484 Appendix P Triangle Route ...