Prestige 652H/HW Series User’s Guide
B-4
IP
Subnetting
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.
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.
Chart B-5 Subnet 1
NETWORK NUMBER
LAST OCTET BIT VALUE
IP Address
192.168.1.
0
IP Address (Binary)
11000000.10101000.00000001.
0
0000000
Subnet Mask
255.255.255.
128
Subnet Mask (Binary)
11111111.11111111.11111111.
1
0000000
Subnet Address: 192.168.1.0
Lowest Host ID: 192.168.1.1
Broadcast Address: 192.168.1.127
Highest Host ID: 192.168.1.126
Chart B-6 Subnet 2
NETWORK NUMBER
LAST OCTET BIT VALUE
IP Address
192.168.1.
128
IP Address (Binary)
11000000.10101000.00000001.
1
0000000
Subnet Mask
255.255.255.
128
Subnet Mask (Binary)
11111111.11111111.11111111.
1
0000000
Subnet Address: 192.168.1.128 Lowest
Host ID: 192.168.1.129
Broadcast Address: 192.168.1.255
Highest Host ID: 192.168.1.254
The remaining 7 bits determine the number of hosts each subnet can have. Host IDs of all zeros represent the
subnet itself and host IDs of all ones are the broadcast address for that subnet, so the actual number of hosts
available on each subnet in the example above is 2
7
– 2 or 126 hosts for each subnet.
192.168.1.0 with mask 255.255.255.128 is the subnet itself, and 192.168.1.127 with mask 255.255.255.128 is
the directed broadcast address for the first subnet. Therefore, the lowest IP address that can be assigned to an
Содержание Prestige 652H series
Страница 1: ...Prestige 652H HW Series ADSL Security Wireless LAN Router User s Guide Version 3 40 March 2004 ...
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Страница 173: ...Prestige 652H HW Series User s Guide Firewall Screens 13 11 Figure 13 5 Insert Append A Firewall Rule ...
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Страница 197: ...VPN IPSec V Part V VPN IPSec This part provides information about configuring VPN IPSec for secure communications ...
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Страница 227: ...Prestige 652H HW Series User s Guide VPN Screens 16 23 Figure 16 8 Manual Setup ...
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Страница 493: ...XII Part XII Appendices and Index This part contains additional background information and an index or key terms ...
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