Code:
$ cat /etc/default/dhcpagent
#
# Copyright 2007 Sun Microsystems, Inc. All rights reserved.
# Use is subject to license terms.
#
#ident "@(#)dhcpagent.dfl 1.11 07/01/29 SMI"
#
#
# This file contains tunable parameters for dhcpagent(1M).
#
# All parameters can be tuned for a specific interface by prepending
# the interface name to the parameter name. For example, to make
# RELEASE_ON_SIGTERM happen on all interfaces except hme0, specify:
#
# hme0.RELEASE_ON_SIGTERM=no
# RELEASE_ON_SIGTERM=yes
#
# An interface name alone specifies IPv4 DHCP. For DHCPv6, append ".v6".
# Some examples:
#
# hme0.RELEASE_ON_SIGTERM=no specify hme0 v4 behavior
# hme0.v6.RELEASE_ON_SIGTERM=no specify hme0 v6 behavior
# RELEASE_ON_SIGTERM=no match all v4 interfaces
# .v6.RELEASE_ON_SIGTERM=no match all v6 interfaces
# By default, when the DHCP agent is sent a SIGTERM (typically when
# the system is shut down), all managed addresses are dropped rather
# than released. Dropping an address does not notify the DHCP server
# that the address is no longer in use, leaving it possibly available
# for subsequent use by the same client. If DHCP is later restarted
# on the interface, the client will ask the server if it can continue
# to use the address. If the server either grants the request, or
# does not answer (and the lease has not yet expired), then the client
# will use the original address.
#
# By uncommenting the following parameter-value pairs, all managed
# interfaces are released on SIGTERM instead. In that case, the DHCP
# server is notified that the address is available for use. Further,
# if DHCP is later restarted on the interface, the client will not
# request its previous address from the server, nor will it attempt to
# reuse the previous lease. This behavior is often preferred for
# roaming systems.
#
# RELEASE_ON_SIGTERM=yes
# .v6.RELEASE_ON_SIGTERM=yes
# By default, the DHCP agent waits 3 seconds to collect OFFER
# responses to a DISCOVER. If it receives no OFFERs in this time, it
# then waits for another 3 seconds, and so forth. To change this
# behavior, set and uncomment the following parameter-value pair.
# Note: this does not control the retransmission strategy for
# DISCOVERs, which is formally specified in RFC 2131. This parameter
# is specified in seconds.
#
# OFFER_WAIT=
# By default, the DHCP agent does not send out a client identifier
# (and hence, the chaddr field is used by the DHCP server as the
# client identifier.) To make the DHCP agent send a client
# identifier, set and uncomment the following parameter-value pair.
# Note that by default this is treated as an NVT ASCII string. To
# specify a binary value, prepend "0x" to a sequence of hexadecimal
# digits (for example, the value 0xAABBCC11 would set the client
# identifier to the 4-byte binary sequence 0xAA 0xBB 0xCC 0x11).
#
# CLIENT_ID=
# By default, the DHCP agent will try to request the hostname currently
# associated with the interface performing DHCP. If this option is
# enabled, the agent will attempt to find a host name in /etc/hostname.<if>,
# which must contain a line of the form
#
# inet name
#
# where "name" is a single RFC 1101-compliant token. If found, the token
# will be used to request that host name from the DHCP server. To prevent
# this, uncomment the following line.
#
# REQUEST_HOSTNAME=no
# By default, a parameter request list requesting a subnet mask (1),
# router (3), DNS server (6), hostname (12), DNS domain (15), broadcast
# address (28), and encapsulated vendor options (43), is sent to the DHCP
# server when the DHCP agent sends requests. However, if desired, this
# can be changed by altering the following parameter-value pair. The
# numbers correspond to the values defined in the IANA bootp-dhcp-parameters
# registry at the time of this writing.
#
PARAM_REQUEST_LIST=1,3,6,12,15,28,43
# The default DHCPv6 parameter request list has preference (7), unicast (12),
# DNS addresses (23), DNS search list (24), NIS addresses (27), and
# NIS domain (29). This may be changed by altering the following parameter-
# value pair. The numbers correspond to the values defined in the IANA
# dhcpv6-parameters registry at the time of this writing.
.v6.PARAM_REQUEST_LIST=7,12,23,24,27,29
