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Prestige 660RU-Tx Series User’s Guide
Appendix C
262
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”). You want to
have two separate networks.
Table 86
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
Table 87
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
Summary of Contents for ADSL2+ Ethernet/USB Gateway 660RU-Tx Series
Page 1: ...Prestige 660RU Tx Series ADSL2 Ethernet USB Gateway User s Guide Version 3 40 January 2005 ...
Page 2: ......
Page 22: ...Prestige 660RU Tx Series User s Guide 21 ...
Page 26: ...Prestige 660RU Tx Series User s Guide 25 ...
Page 30: ...Prestige 660RU Tx Series User s Guide 29 Introduction to DSL ...
Page 38: ...Prestige 660RU Tx Series User s Guide 37 Chapter 1 Getting To Know Your Prestige ...
Page 56: ...Prestige 660RU Tx Series User s Guide 55 Chapter 4 Password Setup ...
Page 64: ...Prestige 660RU Tx Series User s Guide 63 Chapter 5 LAN Setup ...
Page 74: ...Prestige 660RU Tx Series User s Guide 73 Chapter 6 WAN Setup ...
Page 86: ...Prestige 660RU Tx Series User s Guide 85 Chapter 7 Network Address Translation NAT Screens ...
Page 94: ...Prestige 660RU Tx Series User s Guide 93 Chapter 10 Remote Management Configuration ...
Page 108: ...Prestige 660RU Tx Series User s Guide 107 Chapter 11 Universal Plug and Play UPnP ...
Page 124: ...Prestige 660RU Tx Series User s Guide 123 Chapter 13 Introducing the SMT ...
Page 128: ...Prestige 660RU Tx Series User s Guide 127 Chapter 14 Menu 1 General Setup ...
Page 132: ...Prestige 660RU Tx Series User s Guide 131 Chapter 15 Menu 2 WAN Backup Setup ...
Page 136: ...Prestige 660RU Tx Series User s Guide 135 Chapter 16 Menu 3 LAN Setup ...
Page 158: ...Prestige 660RU Tx Series User s Guide 157 Chapter 19 Static Route Setup ...
Page 162: ...Prestige 660RU Tx Series User s Guide 161 Chapter 20 Bridging Setup ...
Page 178: ...Prestige 660RU Tx Series User s Guide 177 Chapter 21 Network Address Translation NAT ...
Page 206: ...Prestige 660RU Tx Series User s Guide 205 Chapter 24 System Information and Diagnosis ...
Page 224: ...Prestige 660RU Tx Series User s Guide 223 Chapter 26 System Maintenance ...
Page 228: ...Prestige 660RU Tx Series User s Guide 227 Chapter 27 Remote Management ...
Page 238: ...Prestige 660RU Tx Series User s Guide 237 Chapter 28 IP Policy Routing ...
Page 242: ...Prestige 660RU Tx Series User s Guide 241 Chapter 29 Call Scheduling ...
Page 260: ...Prestige 660RU Tx Series User s Guide 259 Appendix B ...
Page 268: ...Prestige 660RU Tx Series User s Guide 267 Appendix C ...
Page 272: ...Prestige 660RU Tx Series User s Guide 271 Appendix E ...
Page 274: ...Prestige 660RU Tx Series User s Guide 273 Appendix F ...
Page 280: ...Prestige 660RU Tx Series User s Guide 279 Appendix G ...