Netopia 430 S/T, Справочное руководство

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C-12 Netopia ISDN Router Reference Guide
The example follows these rules:
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An IP address must not be used as a static address if it is also
in a range of addresses being distributed by DHCP or MacIP.
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A single IP address range is used by all the address-ser ved
clients. These include DHCP, BOOTP, MacIP, and WAN clients,
even though BOOTP and static MacIP clients might not be
considered ser ved.
■
The address range specified for address-ser ved clients cannot
wrap around from the end of the total available range back to
the beginning. See below for a fur ther explanation and an
example.
■
The network address issued by an ISP cannot be used as a
host address.
A DHCP example
Suppose, for example, that your ISP gave your network the IP
address 199.1.1.32, and a 4-bit subnet mask. Address 199.1.1.32
is reser ved as the network address. Address 199.1.1.47 is
reser ved as the broadcast address. This leaves 14 addresses to
allocate, from 199.1.1.33 through 199.1.1.46. If you want to
allocate a sub-block of 10 addresses using DHCP, enter “10” in the
DHCP Setup screen’s
Number of Addresses to Allocate item. Then,
in the same screen’s First Address item, enter the first address in
the sub-block to allocate such that all 10 addresses are within your
original block. You could enter 199.1.1.33, or 199.1.1.37, or any
address between them. Note that if you entered 199.1.1.42 as the
first address, network routing errors would probably result because
you would be using a range with addresses that do not belong to
your network (199.1.1.49, 199.1.1.50, and 199.1.1.51).
Nested IP subnets
Under cer tain situations, you may wish to create remote subnets
from the limited number of IP addresses issued by your ISP or other
authority. You can do this using connection profiles. These subnets