
264
Appendix G IP subnetting
NN47922-501
Table 59
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 59
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
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 222
Page 14: ...14 Contents NN47922 501 ...
Page 24: ...24 Tables NN47922 501 ...
Page 30: ...30 Preface NN47922 501 ...
Page 46: ...46 Chapter 2 Introducing the SMT NN47922 501 SMT menus at a glance Figure 6 SMT overview ...
Page 70: ...70 Chapter 3 WAN and Dial Backup Setup NN47922 501 ...
Page 78: ...78 Chapter 4 LAN setup NN47922 501 ...
Page 100: ...100 Chapter 6 Remote Node setup NN47922 501 ...
Page 104: ...104 Chapter 7 IP Static Route Setup NN47922 501 ...
Page 132: ...132 Chapter 9 Network Address Translation NAT NN47922 501 ...
Page 154: ...154 Chapter 11 Filter configuration NN47922 501 ...
Page 158: ...158 Chapter 12 SNMP Configuration NN47922 501 ...
Page 198: ...198 Chapter 15 Firmware and configuration file maintenance NN47922 501 ...
Page 212: ...212 Chapter 17 Remote Management NN47922 501 ...
Page 232: ...232 Appendix B Triangle Route NN47922 501 ...
Page 252: ...252 Appendix D PPPoE NN47922 501 ...
Page 260: ...260 Appendix F Hardware specifications NN47922 501 ...
Page 270: ...270 Appendix G IP subnetting NN47922 501 ...
Page 308: ...308 Appendix H Command Interpreter NN47922 501 ...
Page 312: ...312 Appendix I NetBIOS filter commands NN47922 501 ...
Page 336: ...336 Appendix L Brute force password guessing protection NN47922 501 ...