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Herita
g
e Series ADSL Brid
g
e/ Router
8-11
DHCP Server Operation
is equivalent to
host joe {
hardware ethernet 08:00:2b:4c:29:32;
fixed-address joe.fugue.com;
option host-name "joe";
}
An
option host-name
statement within a host declaration will override the
use of the name in the host declaration.
server-identifier
server-identifier
hostnam
e;
The server-identifier statement can be used to define the value that is sent
in the DHCP Server Identifier option for a given scope. The value specified
must be an IP address for the DHCP server, and must be reachable by all
clients served by a particular scope. The use of the server-identifier
statement is not recommended - the only reason to use it is to force a value
other than the default value to be sent on occasions where the default value
would be incorrect. The default value is the first IP address associated with
the physical network interface on which the request arrived. The usual case
where the
server-identifier
statement needs to be sent is when a physical
interface has more than one IP address, and the one being sent by default is
not appropriate for some or all clients served by that interface.
8.4.5 Option statements
The DHCP server can supply values for all options given in RFC2132,
including those which the DHCP client cannot use for configuration (this is
to allow option support on, for example, Microsoft clients, which should
support a much wider range of configuration options). The available
options are as follows.
option subnet-mask
ip-addres
s;
The subnet mask option specifies the client’s subnet mask as per RFC
950. If no subnet mask option is provided anywhere in scope, DHCP
will use the subnet mask from the subnet declaration for the network
on which an address is being assigned. However, any subnet-mask
option declaration that is in scope for the address being assigned will
override the subnet mask specified in the subnet declaration.