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Prestige 861H Series User’s Guide
Appendix C IP Subnetting
298
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.
Table 96
Alternative Subnet Mask Notation
SUBNET MASK IP ADDRESS
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
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.
Table 97
Two Subnets Example
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
The first three octets of the address make up the network number (class “C”). You want to
have two separate 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.
Содержание P-861H-G1
Страница 1: ...Prestige 861H Series VDSL Router Bridge User s Guide Version 3 40 8 2005...
Страница 2: ......
Страница 10: ...Prestige 861H Series User s Guide 9 Customer Support...
Страница 22: ...Prestige 861H Series User s Guide 21 Table of Contents...
Страница 28: ...Prestige 861H Series User s Guide 27 List of Figures...
Страница 36: ...Prestige 861H Series User s Guide 35 Introduction to DSL...
Страница 62: ...Prestige 861H Series User s Guide 61 Chapter 3 Wizard Setup for Internet Access...
Страница 70: ...Prestige 861H Series User s Guide 69 Chapter 4 LAN Setup...
Страница 84: ...Prestige 861H Series User s Guide 83 Chapter 5 WAN Setup...
Страница 96: ...Prestige 861H Series User s Guide 95 Chapter 6 Network Address Translation NAT Screens...
Страница 106: ...Prestige 861H Series User s Guide 105 Chapter 9 Remote Management Configuration...
Страница 120: ...Prestige 861H Series User s Guide 119 Chapter 10 Universal Plug and Play UPnP...
Страница 134: ...Prestige 861H Series User s Guide 133 Chapter 12 Maintenance...
Страница 140: ...Prestige 861H Series User s Guide 139 Chapter 13 Introducing the SMT...
Страница 148: ...Prestige 861H Series User s Guide 147 Chapter 15 Menu 3 LAN Setup...
Страница 168: ...Prestige 861H Series User s Guide 167 Chapter 18 Static Route Setup...
Страница 202: ...Prestige 861H Series User s Guide 201 Chapter 21 Filter Configuration...
Страница 214: ...Prestige 861H Series User s Guide 213 Chapter 23 System Information and Diagnosis...
Страница 226: ...Prestige 861H Series User s Guide 225 Chapter 24 Firmware and Configuration File Maintenance...
Страница 236: ...Prestige 861H Series User s Guide 235 Chapter 26 Remote Management...
Страница 250: ...Prestige 861H Series User s Guide 249 Chapter 28 Call Scheduling...
Страница 258: ...Prestige 861H Series User s Guide 257 Chapter 30 System Commands...
Страница 280: ...Prestige 861H Series User s Guide 279 Chapter 33 Troubleshooting Figure 187 Security Settings Java Scripting...
Страница 284: ...Prestige 861H Series User s Guide 283 Appendix A...
Страница 304: ...Prestige 861H Series User s Guide 303 Appendix C...
Страница 310: ...Prestige 861H Series User s Guide 309 Appendix E NetBIOS Filter Commands...
Страница 334: ...Prestige 861H Series User s Guide 333 Appendix J...