Vantage CNM 2.0 User’s Guide
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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.
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.
Table 120 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 121 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
Note: In the following charts, shaded/bolded last octet bit values indicate host
ID bits “borrowed” to form network ID bits. The number of “borrowed” host ID
bits determines the number of subnets you can have. The remaining number
of host ID bits (after “borrowing”) determines the number of hosts you can
have on each subnet.
Содержание VANTAGE CNM 2.0 -
Страница 30: ...Vantage CNM 2 0 User s Guide 33 Chapter 1 Introducing Vantage ...
Страница 40: ...Vantage CNM 2 0 User s Guide 43 Chapter 2 GUI Introduction ...
Страница 66: ...Vantage CNM 2 0 User s Guide 69 Chapter 4 Configuration Select Device BB General ...
Страница 78: ...Vantage CNM 2 0 User s Guide 81 Chapter 5 Configuration LAN ...
Страница 96: ...Vantage CNM 2 0 User s Guide 99 Chapter 7 Configuration DMZ ...
Страница 126: ...Vantage CNM 2 0 User s Guide 129 Chapter 8 Configuration WAN ...
Страница 140: ...Vantage CNM 2 0 User s Guide 143 Chapter 9 Configuration NAT ...
Страница 144: ...Vantage CNM 2 0 User s Guide 147 Chapter 10 Configuration Static Route ...
Страница 162: ...Vantage CNM 2 0 User s Guide 165 Chapter 11 Configuration VPN ...
Страница 182: ...Vantage CNM 2 0 User s Guide 185 Chapter 12 Configuration Firewall ...
Страница 188: ...Vantage CNM 2 0 User s Guide 191 Chapter 13 Configuration Device Log ...
Страница 236: ...Vantage CNM 2 0 User s Guide 239 Chapter 18 Other System Screens ...
Страница 239: ...Vantage CNM 2 0 User s Guide Chapter 19 Monitor Alarms 242 Figure 132 Monitor Current Alarms ...
Страница 242: ...Vantage CNM 2 0 User s Guide 245 Chapter 19 Monitor Alarms ...
Страница 248: ...Vantage CNM 2 0 User s Guide 251 Chapter 20 Other Monitor Screens ...
Страница 254: ...Vantage CNM 2 0 User s Guide 257 Figure 151 WFTPD Pro Log On ...
Страница 266: ...Vantage CNM 2 0 User s Guide 269 ...
Страница 274: ...Vantage CNM 2 0 User s Guide 277 ...
Страница 286: ...Vantage CNM 2 0 User s Guide 289 ...
Страница 288: ...Vantage CNM 2 0 User s Guide 291 ...
Страница 291: ...Vantage CNM 2 0 User s Guide 294 Figure 181 ESS Provides Campus Wide Coverage ...
Страница 292: ...Vantage CNM 2 0 User s Guide 295 ...
Страница 312: ...Vantage CNM 2 0 User s Guide 315 ...