Appendix D IP Subnetting
P-660HWP-D1 User’s Guide
335
By convention, subnet masks always consist of a continuous sequence of ones beginning from
the leftmost bit of the mask, followed by a continuous sequence of zeros, for a total number of
32 bits.
Since the mask is always a continuous number of ones beginning from the left, followed by a
continuous number of zeros for the remainder of the 32 bit mask, you can simply specify the
number of ones instead of writing the value of each octet. This is usually specified by writing
a “/” followed by the number of bits in the mask after the address.
For example, 192.1.1.0 /25 is equivalent to saying 192.1.1.0 with mask 255.255.255.128.
The following table shows all possible subnet masks for a class “C” address using both
notations.
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.
Table 146
Alternative Subnet Mask Notation
SUBNET MASK
SUBNET MASK “1” BITS
LAST OCTET BIT VALUE
255.255.255.0
/24
0000 0000
255.255.255.128
/25
1000 0000
255.255.255.192
/26
1100 0000
255.255.255.224
/27
1110 0000
255.255.255.240
/28
1111 0000
255.255.255.248
/29
1111 1000
255.255.255.252
/30
1111 1100
Table 147
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
Содержание P-660HWP-D1
Страница 2: ......
Страница 7: ...Safety Warnings P 660HWP D1 User s Guide 7...
Страница 8: ...Safety Warnings P 660HWP D1 User s Guide 8...
Страница 10: ...Contents Overview P 660HWP D1 User s Guide 10...
Страница 20: ...Table of Contents P 660HWP D1 User s Guide 20...
Страница 26: ...List of Figures P 660HWP D1 User s Guide 26...
Страница 31: ...31 PART I Introduction Introducing the P 660HWP D1 33 Introducing the Web Configurator 41...
Страница 32: ...32...
Страница 39: ...Chapter 1 Introducing the P 660HWP D1 P 660HWP D1 User s Guide 39 Figure 7 P 660HWP D1 with ISDN...
Страница 40: ...Chapter 1 Introducing the P 660HWP D1 P 660HWP D1 User s Guide 40...
Страница 54: ...Chapter 2 Introducing the Web Configurator P 660HWP D1 User s Guide 54 Figure 19 System General...
Страница 55: ...55 PART II Wizards Wizard Setup for Internet Wireless Access 57 Bandwidth Management Wizard 69...
Страница 56: ...56...
Страница 72: ...72...
Страница 90: ...Chapter 5 WAN Setup P 660HWP D1 User s Guide 90...
Страница 147: ...147 PART IV Security Firewalls 149 Firewall Configuration 161 Content Filtering 183 Certificates 187...
Страница 148: ...148...
Страница 168: ...Chapter 11 Firewall Configuration P 660HWP D1 User s Guide 168 Figure 93 Firewall Edit Rule...
Страница 182: ...Chapter 11 Firewall Configuration P 660HWP D1 User s Guide 182...
Страница 186: ...Chapter 12 Content Filtering P 660HWP D1 User s Guide 186...
Страница 210: ...210...
Страница 214: ...Chapter 14 Static Route P 660HWP D1 User s Guide 214...
Страница 230: ...Chapter 16 Dynamic DNS Setup P 660HWP D1 User s Guide 230...
Страница 242: ...Chapter 17 Remote Management Configuration P 660HWP D1 User s Guide 242...
Страница 254: ...Chapter 18 Universal Plug and Play UPnP P 660HWP D1 User s Guide 254...
Страница 255: ...255 PART VI Maintenance and Troubleshooting System 257 Logs 263 Tools 281 Diagnostic 287 Troubleshooting 289...
Страница 256: ...256...
Страница 262: ...Chapter 19 System P 660HWP D1 User s Guide 262...
Страница 280: ...Chapter 20 Logs P 660HWP D1 User s Guide 280...
Страница 286: ...Chapter 21 Tools P 660HWP D1 User s Guide 286...
Страница 296: ...296...
Страница 340: ...Appendix D IP Subnetting P 660HWP D1 User s Guide 340...
Страница 344: ...Appendix E Command Interpreter P 660HWP D1 User s Guide 344...
Страница 360: ...Appendix H Legal Information P 660HWP D1 User s Guide 360...
Страница 366: ...Appendix I Customer Support P 660HWP D1 User s Guide 366...
Страница 374: ...Index P 660HWP D1 User s Guide 374...