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9-4
DHCP Client Configuration
Options. DHCP Options are defined in [3], although an DHCP client only
supports a limited subset of those described there
9.2.1 Request
request [
option
] [, ...
optio
n];
The
request
statement causes the client to request that any server
responding to the client send the client its values for the specified options.
Only the option names should be specified in the request statement - not
option parameters.
9.2.2 Require
require [
option
] [, ...
option
];
The
require
statement lists options that must be sent in order for an offer to
be accepted. Offers that do not contain all the listed options will be ignored.
9.2.3 Send
send { [
option declaration
] [ ...
option declaration
] }
The send statement causes the client to send the specified options to the
server with the specified values. Options that are always sent in the DHCP
protocol should not be specified here, except that the client can specify a
requested-lease-time option other than the default requested lease time,
which is two hours (this would normally be done on a per-interface basis:
see section 6.3.2). The other obvious use for this statement is to send
information to the server that will allow it to differentiate between this
client and other clients or kinds of clients.
9.3 Other declarations
9.3.1 Reject
reject
ip-addres
s;
The
reject
statement causes the DHCP client to reject offers from servers
who use the specified address as a server identifier. This can be used to
avoid being configured by rogue or misconfigured dhcp servers, although
it should be a last resort - better to track down the bad DHCP server and fix
it.