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8-6
DHCP Server Operation
on which the client is booting. If it doesn’t find any such entry, it then tries
to find an entry which has no fixed-address parameter. If no such entry is
found, then DHCP acts as if there is no entry in the
dhcpd.conf
file for that
client, even if there is an entry for that client on a different subnet or shared
network.
8.4.2 Declarations
Subnet
subnet
subnet-number
netmask
netmask
{
[ parameters
]
[ declarations
]
}
The
subnet
statement is used to provide the DHCP server with enough
information to determine whether or not an IP address is on that subnet.
It may also be used to provide subnet-specific parameters and to specify
what addresses may be dynamically allocated to clients booting on that
subnet. Such addresses are specified using the
range
declaration.
subnet-number
should be an IP address which resolves to the subnet
number of the subnet being described. The
netmask
should be an IP address
which resolves to the subnet mask of the subnet being described. The
subnet number, together with the subnet mask, are sufficient to determine
whether any given IP address is on the specified subnet.
Although a subnet mask must be given with every subnet declaration, it is
recommended that if there is any variance in subnet masks at a site, a
subnet-mask
option statement be used in each
subnet
declaration to set the
desired subnet mask; any
subnet-mask
option statement will override the
subnet mask declared in the
subnet
statement.
Range
range [ dynamic-bootp ] low-address [ high-address ];
For any subnet on which addresses will be assigned dynamically, there
must be at least one
range
statement. The range statement gives the lowest
and highest IP addresses in a range. All IP addresses in the range should be
in the subnet in which the
range
statement is declared. The
dynamic-bootp
flag may be specified if addresses in the specified range may be
dynamically assigned to BOOTP clients as well as DHCP clients. When
specifying a single address,
high-address
can be omitted.