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Appendix H IP Addresses and Subnetting
The first mask shown is the class “C” natural mask. Normally if no mask is specified it is
understood that the natural mask is being used.
Example: Two Subnets
As an example, you have a class “C” address 192.168.1.0 with subnet mask of 255.255.255.0.
The first three octets of the address make up the network number (class “C”).
To make two networks, divide the network 192.168.1.0 into two separate subnets by
converting one of the host ID bits of the IP address to a network number bit. The “borrowed”
host ID bit can be either “0” or “1” thus giving two subnets; 192.168.1.0 with mask
255.255.255.128 and 192.168.1.128 with mask 255.255.255.128.
Note:
In the following charts, shaded/bolded last octet bit values indicate host ID bits
“borrowed” to make network ID bits. The number of “borrowed” host ID bits
determines the number of subnets you can have. The remaining number of
host ID bits (after “borrowing”) determines the number of hosts you can have
on each subnet.
255.255.255.240
/28
1111 0000
240
255.255.255.248
/29
1111 1000
248
255.255.255.252
/30
1111 1100
252
Table 103
Alternative Subnet Mask Notation (continued)
SUBNET MASK
SUBNET MASK “1” BITS
LAST OCTET BIT VALUE
DECIMAL
Table 104
Two Subnets Example
IP/SUBNET MASK
NETWORK NUMBER
HOST ID
IP Address
192.168.1.
0
IP Address (Binary)
11000000.10101000.00000001.
00000000
Subnet Mask
255.255.255.
0
Subnet Mask (Binary)
11111111.11111111.11111111.
00000000
Table 105
Subnet 1
IP/SUBNET MASK
NETWORK NUMBER
LAST OCTET BIT
VALUE
IP Address
192.168.1.
0
IP Address (Binary)
11000000.10101000.00000001.
0
0000000
Subnet Mask
255.255.255.
128
Subnet Mask (Binary)
11111111.11111111.11111111.
1
0000000
Содержание VSG-1200 V2
Страница 1: ...VSG 1200 V2 Vantage Service Gateway User s Guide Version 1 00 10 2006 Edition 1 ...
Страница 6: ...VSG 1200 V2 User s Guide Safety Warnings 6 ...
Страница 19: ...VSG 1200 V2 User s Guide 19 Table of Contents ...
Страница 25: ...VSG 1200 V2 User s Guide 25 List of Figures ...
Страница 29: ...VSG 1200 V2 User s Guide 29 List of Tables ...
Страница 37: ...VSG 1200 V2 User s Guide 37 Chapter 1 Getting to Know Your VSG ...
Страница 49: ...VSG 1200 V2 User s Guide 49 Chapter 3 The Web Configurator ...
Страница 55: ...VSG 1200 V2 User s Guide 55 Chapter 4 Initial Setup Example ...
Страница 69: ...VSG 1200 V2 User s Guide 69 Chapter 6 LAN and WAN Setup ...
Страница 83: ...VSG 1200 V2 User s Guide 83 Chapter 9 Authentication Figure 32 System Settings Authentication ...
Страница 111: ...VSG 1200 V2 User s Guide 111 Chapter 12 Dynamic Subscriber Accounts ...
Страница 115: ...VSG 1200 V2 User s Guide 115 Chapter 13 Port Location Mapping ...
Страница 147: ...VSG 1200 V2 User s Guide 147 Chapter 16 Bandwidth Management ...
Страница 167: ...VSG 1200 V2 User s Guide 167 Chapter 22 Static Route ...
Страница 175: ...VSG 1200 V2 User s Guide 175 Chapter 24 Syslog ...
Страница 181: ...VSG 1200 V2 User s Guide 181 Chapter 26 SNMP ...
Страница 195: ...VSG 1200 V2 User s Guide 195 Chapter 28 System Status ...
Страница 213: ...VSG 1200 V2 User s Guide 213 Chapter 31 SSL Certificate ...
Страница 229: ...VSG 1200 V2 User s Guide 229 Chapter 32 Using The SMT ...
Страница 239: ...VSG 1200 V2 User s Guide 239 Appendix B IP Address Assignment Conflicts ...
Страница 241: ...VSG 1200 V2 User s Guide 241 Appendix C Subscriber Login ...
Страница 245: ...VSG 1200 V2 User s Guide 245 Appendix D Vendor Specific Attributes ...
Страница 255: ...VSG 1200 V2 User s Guide 255 Appendix F Cable Types and Cable Pin Assignments ...
Страница 267: ...VSG 1200 V2 User s Guide 267 Appendix G Setting up Your Computer s IP Address ...