Appendix B IP Addresses and Subnetting
VMG1312-B Series User’s Guide
323
The following figure shows t he com pany net work aft er subnet t ing. There are now t wo sub-
net works,
A
and
B
.
Figure 183
Subnet t ing Exam ple: Aft er Subnet t ing
I n a 25- bit subnet t he host I D has 7 bit s, so each sub- net work has a m axim um of 2
7
– 2 or 126
possible host s ( a host I D of all zeroes is t he subnet ’s address it self, all ones is t he subnet ’s
broadcast address) .
192.168.1.0 wit h m ask 255.255.255.128 is subnet
A
it self, and 192.168.1.127 wit h m ask
255.255.255.128 is it s broadcast address. Therefore, t he lowest I P address t hat can be assigned t o
an act ual host for subnet
A
is 192.168.1.1 and t he highest is 192.168.1.126.
Sim ilarly, t he host I D range for subnet
B
is 192.168.1.129 t o 192.168.1.254.
Example: Four Subnets
The previous exam ple illust rat ed using a 25- bit subnet m ask t o divide a 24- bit address int o t wo
subnet s. Sim ilarly, t o divide a 24- bit address int o four subnet s, you need t o “ borrow” t wo host I D
bit s t o give four possible com binat ions ( 00, 01, 10 and 11) . The subnet m ask is 26 bit s
( 11111111.11111111.11111111.
1 1
000000) or 255.255.255.192.
Each subnet cont ains 6 host I D bit s, giving 2
6
- 2 or 62 host s for each subnet ( a host I D of all
zeroes is t he subnet it self, all ones is t he subnet ’s broadcast address) .
Table 115
Subnet 1
IP/SUBNET MASK
NETWORK NUMBER
LAST OCTET BIT
VALUE
I P Address ( Decim al)
192.168.1.
0
I P Address ( Binary)
11000000.10101000.00000001.
0 0
000000
Subnet Mask ( Binary)
11111111.11111111.11111111.
1 1
000000
Summary of Contents for VMG1312-B Series
Page 4: ...Contents Overview VMG1312 B Series User s Guide 4 Troubleshooting 289 ...
Page 14: ...Table of Contents VMG1312 B Series User s Guide 14 ...
Page 15: ...15 PART I User s Guide ...
Page 16: ...16 ...
Page 30: ...Chapter 2 The Web Configurator VMG1312 B Series User s Guide 30 ...
Page 35: ...Chapter 4 Tutorials VMG1312 B Series User s Guide 35 7 Click Apply to save your settings ...
Page 77: ...77 PART II Technical Reference ...
Page 78: ...78 ...
Page 166: ...Chapter 9 Routing VMG1312 B Series User s Guide 166 ...
Page 184: ...Chapter 10 Quality of Service QoS VMG1312 B Series User s Guide 184 ...
Page 210: ...Chapter 13 Interface Group VMG1312 B Series User s Guide 210 ...
Page 226: ...Chapter 15 Firewall VMG1312 B Series User s Guide 226 ...
Page 232: ...Chapter 17 Parental Control VMG1312 B Series User s Guide 232 ...
Page 242: ...Chapter 19 Certificates VMG1312 B Series User s Guide 242 ...
Page 246: ...Chapter 20 Log VMG1312 B Series User s Guide 246 ...
Page 250: ...Chapter 21 Traffic Status VMG1312 B Series User s Guide 250 ...
Page 256: ...Chapter 24 IGMP Status VMG1312 B Series User s Guide 256 ...
Page 260: ...Chapter 25 xDSL Statistics VMG1312 B Series User s Guide 260 ...
Page 262: ...Chapter 26 User Account VMG1312 B Series User s Guide 262 ...
Page 268: ...Chapter 29 TR 064 VMG1312 B Series User s Guide 268 ...
Page 272: ...Chapter 30 Time Settings VMG1312 B Series User s Guide 272 ...
Page 278: ...Chapter 32 Logs Setting VMG1312 B Series User s Guide 278 ...
Page 296: ...Chapter 36 Troubleshooting VMG1312 B Series User s Guide 296 ...
Page 336: ...Appendix C Pop up Windows JavaScripts and Java Permissions VMG1312 B Series User s Guide 336 ...
Page 350: ...Appendix D Wireless LANs VMG1312 B Series User s Guide 350 ...
Page 374: ...VMG1312 B Series User s Guide 374 Index ...