Appendix D IP Addresses and Subnetting
Vantage CNM User’s Guide
646
Notation
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 subnet mask
255.255.255.128.
The following table shows some possible subnet masks using both notations.
Subnetting
You can use subnetting to divide one network into multiple sub-networks. In the
following example a network administrator creates two sub-networks to isolate a
group of servers from the rest of the company network for security reasons.
In this example, the company network address is 192.168.1.0. The first three
octets of the address (192.168.1) are the network number, and the remaining
octet is the host ID, allowing a maximum of 2
8
– 2 or 254 possible hosts.
Table 285
Alternative Subnet Mask Notation
SUBNET MASK
ALTERNATIVE
NOTATION
LAST OCTET
(BINARY)
LAST OCTET
(DECIMAL)
255.255.255.0
/24
0000 0000
0
255.255.255.128
/25
1000 0000
128
255.255.255.192
/26
1100 0000
192
255.255.255.224
/27
1110 0000
224
255.255.255.240
/28
1111 0000
240
255.255.255.248
/29
1111 1000
248
255.255.255.252
/30
1111 1100
252
Summary of Contents for VANTAGE CNM
Page 2: ......
Page 20: ...New Template User s Guide 20...
Page 23: ...23 PART I Introduction Introducing Vantage CNM 21 GUI Introduction 25...
Page 24: ...24...
Page 46: ...46...
Page 50: ...Chapter 3 Load or Save Building Blocks BB Vantage CNM User s Guide 50...
Page 140: ...Chapter 6 Device Security Settings Vantage CNM User s Guide 140 IKE Gateway Policy Add Edit...
Page 242: ...Chapter 8 Device Log Vantage CNM User s Guide 242...
Page 246: ...246...
Page 346: ...Chapter 11 IPSec VPN Vantage CNM User s Guide 346...
Page 356: ...Chapter 13 L2TP VPN Vantage CNM User s Guide 356...
Page 384: ...Chapter 14 Vantage CNM User s Guide 384...
Page 408: ...408...
Page 456: ...Chapter 18 Firmware Management Vantage CNM User s Guide 456...
Page 474: ...474...
Page 494: ...494...
Page 534: ...Chapter 26 Device Alarm Vantage CNM User s Guide 534...
Page 535: ...535 PART VII Log Report Device Operation Report 537 CNM Logs 553 VRPT 555...
Page 536: ...536...
Page 552: ...Chapter 27 Device Operation Report Vantage CNM User s Guide 552...
Page 560: ...560...
Page 580: ...Chapter 30 CNM System Setting Vantage CNM User s Guide 580...
Page 588: ...Chapter 33 Vantage CNM Software Upgrade Vantage CNM User s Guide 588...
Page 592: ...Chapter 35 About CNM Vantage CNM User s Guide 592...
Page 593: ...593 PART IX Account Management User Group 595 Account 599...
Page 594: ...594...
Page 598: ...Chapter 36 User Group Vantage CNM User s Guide 598...
Page 603: ...603 PART X Troubleshooting Troubleshooting 605...
Page 604: ...604...
Page 610: ...610...
Page 616: ...Appendix A Product Specifications Vantage CNM User s Guide 616...
Page 634: ...Appendix B Setting up Your Computer s IP Address Vantage CNM User s Guide 634...
Page 656: ...Appendix E IP Address Assignment Conflicts Vantage CNM User s Guide 656...
Page 666: ...Appendix G Importing Certificates Vantage CNM User s Guide 666...