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Vantage RADIUS User’s Guide
H-4
IP
Subnetting
)
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 H-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 H-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 actual host for the first subnet is 192.168.1.1 and the highest is 192.168.1.126. Similarly the host ID
range for the second subnet is 192.168.1.129 to 192.168.1.254.
Example: Four Subnets
Summary of Contents for VANTAGE RADIUS 50
Page 1: ...Vantage RADIUS 50 User s Guide Version 1 0 8 2005 ...
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Page 65: ...RADIUS Server II Part II RADIUS Server This part introduces the RADIUS Server screens ...
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Page 157: ...Vantage RADIUS User s Guide Troubleshooting A 11 Figure A 8 Java Sun ...
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