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8-
7
DHCP Server Operation
Host
host
hostname
{
[ parameters
]
[ declarations
]
}
There must be at least one
host
statement for every BOOTP client that is to
be served.
Host
statements may also be specified for DHCP clients,
although this is not required unless booting is only enabled for known
hosts. If it is desirable to be able to boot a DHCP or BOOTP client on more
than one subnet with fixed addresses, more than one address may be
specified in the
fixed-address
parameter, or more than one host statement
may be specified. If client-specific boot parameters must change based on
the network to which the client is attached, then multiple
host
statements
should be used. If a client is to be booted using a fixed address if it’s
possible, but should be allocated a dynamic address otherwise, then a
host
statement must be specified without a
fixed-address
clause.
hostname
should
be a name identifying the host. If a
hostname
option is not specified for the
host,
hostname
is used. Host declarations are matched to actual DHCP or
BOOTP clients by matching the
dhcp-client-identifier
option specified in the
host
declaration to the one supplied by the client, or, if the
host
declaration
or the client does not provide a
dhcp-client-identifier
option, by matching the
hardware
parameter in the
host
declaration to the network hardware
address supplied by the client. BOOTP clients do not normally provide a
dhcp-client-identifie
r, so the hardware address must be used for all clients
that may boot using the BOOTP protocol.
Group
group { [ parameters ] [ declarations ] }
The group statement is used simply to apply one or more parameters to a
group of declarations.
It can be used to group hosts, shared networks, subnets, or even other
groups.
8.4.3 ALLOW and DENY
The
allow
and
deny
statements can be used to control the behaviour of the
DHCP server in response to various sorts of requests.
unknown-clients
allow unknown-clients;