no point having two copies of this file - this copy never got

installed anyway;

ok krw henning

1 files changed, 0 insertions, 591 deletions

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-.\"	$OpenBSD: dhcp-options.5,v 1.8 2007/05/31 19:19:43 jmc Exp $
-.\"
-.\" Copyright (c) 1995, 1996, 1997, 1998 The Internet Software Consortium.
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\"
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. Neither the name of The Internet Software Consortium nor the names
-.\"    of its contributors may be used to endorse or promote products derived
-.\"    from this software without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
-.\" CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
-.\" INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
-.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-.\" DISCLAIMED.  IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
-.\" CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-.\" LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
-.\" USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
-.\" ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
-.\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
-.\" OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\" This software has been written for the Internet Software Consortium
-.\" by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
-.\" Enterprises.  To learn more about the Internet Software Consortium,
-.\" see ``http://www.isc.org/isc''.  To learn more about Vixie
-.\" Enterprises, see ``http://www.vix.com''.
-.\"
-.Dd $Mdocdate: May 31 2007 $
-.Dt DHCP-OPTIONS 5
-.Os
-.Sh NAME
-.Nm dhcp-options
-.Nd Dynamic Host Configuration Protocol options
-.Sh DESCRIPTION
-The Dynamic Host Configuration protocol allows the client to receive
-.Ic options
-from the DHCP server describing the network configuration and various
-services that are available on the network.
-When configuring
-.Xr dhcpd 8
-or
-.Xr dhclient 8 ,
-options must often be declared.
-The syntax for declaring options, and the names and formats of the options
-that can be declared, are documented here.
-.Sh REFERENCE: OPTION STATEMENTS
-DHCP
-.Ic option
-statements always start with the
-.Ic option
-keyword, followed by an option name, followed by option data.
-The option names and data formats are described below.
-It is not necessary to exhaustively specify all DHCP options \-
-only those options which are needed by clients must be specified.
-.Pp
-Option data comes in a variety of formats, as defined below:
-.Pp
-The
-.Ar ip-address
-data type can be entered either as an explicit IP address
-(e.g., 239.254.197.10) or as a domain name (e.g., haagen.isc.org).
-A domain name must resolve to a single IP address.
-.Pp
-The
-.Ar int32
-data type specifies a signed 32-bit integer.
-The
-.Ar uint32
-data type specifies an unsigned 32-bit integer.
-The
-.Ar int16
-and
-.Ar uint16
-data types specify signed and unsigned 16-bit integers.
-The
-.Ar int8
-and
-.Ar uint8
-data types specify signed and unsigned 8-bit integers.
-Unsigned 8-bit integers are also sometimes referred to as octets.
-.Pp
-The
-.Ar string
-data type specifies an
-.Tn NVT
-.Pq Network Virtual Terminal
-.Tn ASCII
-string, which must be enclosed in double quotes \- for example,
-to specify a domain-name option, the syntax would be
-.Pp
-.Dl option domain-name \&"isc.org\&";
-.Pp
-The
-.Ar flag
-data type specifies a boolean value.
-Booleans can be either true or false
-(or on or off, if that makes more sense to you).
-.Pp
-The
-.Ar data-string
-data type specifies either an
-.Tn NVT ASCII
-string enclosed in double quotes, or a series of octets specified in
-hexadecimal, separated by colons.
-For example:
-.Pp
-.Dl option dhcp-client-identifier \&"CLIENT-FOO\&";
-or
-.Dl option dhcp-client-identifier 43:4c:49:45:54:2d:46:4f:4f;
-.Pp
-The documentation for the various options mentioned below is taken
-from the IETF draft document on DHCP options, RFC 2132.
-Options which are not listed by name may be defined by the name
-.Pf option\- Ns Ar nnn ,
-where
-.Ar nnn
-is the decimal number of the option code.
-These options may be followed either by a string, enclosed in quotes, or by
-a series of octets, expressed as two-digit hexadecimal numbers separated
-by colons.
-For example:
-.Bd -literal -offset indent
-option option-133 "my-option-133-text";
-option option-129 1:54:c9:2b:47;
-.Ed
-.Pp
-Because
-.Xr dhcpd 8
-does not know the format of these undefined option codes,
-no checking is done to ensure the correctness of the entered data.
-.Pp
-The standard options are:
-.Ss RFC 1497 Vendor Extensions
-.Bl -tag -width Ds
-.It Ic option subnet-mask Ar ip-address ;
-The
-.Ic subnet-mask
-option specifies the client's subnet mask as per RFC 950.
-If no subnet-mask option is provided anywhere in scope, as a last resort
-.Xr dhcpd 8
-will use the subnet mask from the subnet declaration for the network on
-which an address is being assigned.
-However,
-.Em any
-subnet-mask option declaration that is in scope for the address being
-assigned will override the subnet mask specified in the subnet declaration.
-.It Ic option time-offset Ar int32 ;
-The
-.Ic time-offset
-option specifies the offset of the client's subnet in seconds from
-Coordinated Universal Time (UTC).
-.It Xo
-.Ic option routers Ar ip-address
-.Oo , Ar ip-address ... Oc ;
-.Xc
-The
-.Ic routers
-option specifies a list of IP addresses for routers on the client's subnet.
-Routers should be listed in order of preference.
-.It Xo
-.Ic option time-servers Ar ip-address
-.Oo , Ar ip-address ... Oc ;
-.Xc
-The
-.Ic time-server
-option specifies a list of RFC 868 time servers available to the client.
-Servers should be listed in order of preference.
-.It Xo
-.Ic option ien116-name-servers Ar ip-address
-.Oo , Ar ip-address ... Oc ;
-.Xc
-The
-.Ic ien116-name-servers
-option specifies a list of IEN 116 name servers available to the client.
-Servers should be listed in order of preference.
-.It Xo
-.Ic option domain-name-servers Ar ip-address
-.Oo , Ar ip-address ... Oc ;
-.Xc
-The
-.Ic domain-name-servers
-option specifies a list of Domain Name System (STD 13, RFC 1035) name servers
-available to the client.
-Servers should be listed in order of preference.
-.It Xo
-.Ic option log-servers Ar ip-address
-.Oo , Ar ip-address ... Oc ;
-.Xc
-The
-.Ic log-servers
-option specifies a list of MIT-LCS UDP log servers available to the client.
-Servers should be listed in order of preference.
-.It Xo
-.Ic option cookie-servers Ar ip-address
-.Oo , Ar ip-address ... Oc ;
-.Xc
-The
-.Ic cookie-servers
-option specifies a list of RFC 865 cookie servers available to the client.
-Servers should be listed in order of preference.
-.It Xo
-.Ic option lpr-servers Ar ip-address
-.Oo , Ar ip-address ... Oc ;
-.Xc
-The
-.Ic lpr-servers
-option specifies a list of RFC 1179 line printer servers available to the
-client.
-Servers should be listed in order of preference.
-.It Xo
-.Ic option impress-servers Ar ip-address
-.Oo , Ar ip-address ... Oc ;
-.Xc
-The
-.Ic impress-servers
-option specifies a list of Imagen Impress servers available to the client.
-Servers should be listed in order of preference.
-.It Xo
-.Ic option resource-location-servers Ar ip-address
-.Oo , Ar ip-address ... Oc ;
-.Xc
-This option specifies a list of RFC 887 Resource Location servers available
-to the client.
-Servers should be listed in order of preference.
-.It Ic option host-name Ar string ;
-This option specifies the name of the client.
-The name may or may not be qualified with the local domain name
-(it is preferable to use the
-.Ic domain-name
-option to specify the domain name).
-See RFC 1035 for character set restrictions.
-.It Ic option boot-size Ar uint16 ;
-This option specifies the length in 512-octet blocks of the default
-boot image for the client.
-.It Ic option merit-dump Ar string ;
-This option specifies the pathname of a file to which the client's
-core image should be dumped in the event the client crashes.
-The path is formatted as a character string consisting of characters from
-the
-.Tn NVT ASCII
-character set.
-.It Ic option domain-name Ar string ;
-This option specifies the domain name that the client should use when
-resolving hostnames via the Domain Name System.
-.It Ic option swap-server Ar ip-address ;
-This specifies the IP address of the client's swap server.
-.It Ic option root-path Ar string ;
-This option specifies the pathname that contains the client's root disk.
-The path is formatted as a character string consisting of characters from
-the
-.Tn NVT ASCII
-character set.
-.El
-.Ss IP Layer Parameters per Host
-.Bl -tag -width Ds
-.It Ic option ip-forwarding Ar flag ;
-This option specifies whether the client should configure its IP layer
-for packet forwarding.
-A value of 0 means disable IP forwarding, and a value of 1 means enable
-IP forwarding.
-.It Ic option non-local-source-routing Ar flag ;
-This option specifies whether the client should configure its IP
-layer to allow forwarding of datagrams with non-local source routes
-(see Section 3.3.5 of [4] for a discussion of this topic).
-A value of 0 means disallow forwarding of such datagrams, and a value of 1
-means allow forwarding.
-.It Xo
-.Ic option policy-filter Ar ip-address ip-address
-.Oo , Ar ip-address ip-address ... Oc ;
-.Xc
-This option specifies policy filters for non-local source routing.
-The filters consist of a list of IP addresses and masks which specify
-destination/mask pairs with which to filter incoming source routes.
-.Pp
-Any source-routed datagram whose next-hop address does not match one
-of the filters should be discarded by the client.
-.Pp
-See STD 3 (RFC 1122) for further information.
-.It Ic option max-dgram-reassembly Ar uint16 ;
-This option specifies the maximum size datagram that the client should be
-prepared to reassemble.
-The minimum legal value is 576.
-.It Ic option default-ip-ttl Ar uint8 ;
-This option specifies the default time-to-live that the client should
-use on outgoing datagrams.
-.It Ic option path-mtu-aging-timeout Ar uint32 ;
-This option specifies the timeout (in seconds) to use when aging Path
-MTU values discovered by the mechanism defined in RFC 1191.
-.It Xo
-.Ic option path-mtu-plateau-table Ar uint16
-.Oo , Ar uint16 ... Oc ;
-.Xc
-This option specifies a table of MTU sizes to use when performing
-Path MTU Discovery as defined in RFC 1191.
-The table is formatted as a list of 16-bit unsigned integers,
-ordered from smallest to largest.
-The minimum MTU value cannot be smaller than 68.
-.El
-.Ss IP Layer Parameters per Interface
-.Bl -tag -width Ds
-.It Ic option interface-mtu Ar uint16 ;
-This option specifies the MTU to use on this interface.
-The minimum legal value for the MTU is 68.
-.It Ic option all-subnets-local Ar flag ;
-This option specifies whether or not the client may assume that all subnets
-of the IP network to which the client is connected use the same MTU as the
-subnet of that network to which the client is directly connected.
-A value of 1 indicates that all subnets share the same MTU.
-A value of 0 means that the client should assume that some subnets of the
-directly connected network may have smaller MTUs.
-.It Ic option broadcast-address Ar ip-address ;
-This option specifies the broadcast address in use on the client's subnet.
-Legal values for broadcast addresses are specified in section 3.2.1.3 of
-STD 3 (RFC 1122).
-.It Ic option perform-mask-discovery Ar flag ;
-This option specifies whether or not the client should perform subnet mask
-discovery using ICMP.
-A value of 0 indicates that the client should not perform mask discovery.
-A value of 1 means that the client should perform mask discovery.
-.It Ic option mask-supplier Ar flag ;
-This option specifies whether or not the client should respond to subnet mask
-requests using ICMP.
-A value of 0 indicates that the client should not respond.
-A value of 1 means that the client should respond.
-.It Ic option router-discovery Ar flag ;
-This option specifies whether or not the client should solicit routers using
-the Router Discovery mechanism defined in RFC 1256.
-A value of 0 indicates that the client should not perform router discovery.
-A value of 1 means that the client should perform router discovery.
-.It Ic option router-solicitation-address Ar ip-address ;
-This option specifies the address to which the client should transmit
-router solicitation requests.
-.It Xo
-.Ic option static-routes Ar ip-address ip-address
-.Oo , Ar ip-address ip-address ... Oc ;
-.Xc
-This option specifies a list of static routes that the client should
-install in its routing cache.
-If multiple routes to the same destination are specified, they are listed
-in descending order of priority.
-.Pp
-The routes consist of a list of IP address pairs.
-The first address is the destination address,
-and the second address is the router for the destination.
-.Pp
-The default route (0.0.0.0) is an illegal destination for a static route.
-To specify the default route, use the
-.Ic routers
-option.
-.El
-.Ss Link Layer Parameters per Interface
-.Bl -tag -width Ds
-.It Ic option trailer-encapsulation Ar flag ;
-This option specifies whether or not the client should negotiate the
-use of trailers (RFC 893 [14]) when using the ARP protocol.
-A value of 0 indicates that the client should not attempt to use trailers.
-A value of 1 means that the client should attempt to use trailers.
-.It Ic option arp-cache-timeout Ar uint32 ;
-This option specifies the timeout in seconds for ARP cache entries.
-.It Ic option ieee802-3-encapsulation Ar flag ;
-This option specifies whether or not the client should use Ethernet
-Version 2 (RFC 894) or IEEE 802.3 (RFC 1042) encapsulation if the
-interface is an Ethernet.
-A value of 0 indicates that the client should use RFC 894 encapsulation.
-A value of 1 means that the client should use RFC 1042 encapsulation.
-.El
-.Ss TCP Parameters
-.Bl -tag -width Ds
-.It Ic option default-tcp-ttl Ar uint8 ;
-This option specifies the default TTL that the client should use when
-sending TCP segments.
-The minimum value is 1.
-.It Ic option tcp-keepalive-interval Ar uint32 ;
-This option specifies the interval (in seconds) that the client TCP
-should wait before sending a keepalive message on a TCP connection.
-The time is specified as a 32-bit unsigned integer.
-A value of zero indicates that the client should not generate keepalive
-messages on connections unless specifically requested by an application.
-.It Ic option tcp-keepalive-garbage Ar flag ;
-This option specifies whether or not the client should send TCP keepalive
-messages with an octet of garbage for compatibility with older implementations.
-A value of 0 indicates that a garbage octet should not be sent.
-A value of 1 indicates that a garbage octet should be sent.
-.El
-.Ss Application and Service Parameters
-.Bl -tag -width Ds
-.It Ic option nis-domain Ar string ;
-This option specifies the name of the client's NIS (Sun Network Information
-Services) domain.
-The domain is formatted as a character string consisting of characters
-from the
-.Tn NVT ASCII
-character set.
-.It Xo
-.Ic option nis-servers Ar ip-address
-.Oo , Ar ip-address ... Oc ;
-.Xc
-This option specifies a list of IP addresses indicating NIS servers
-available to the client.
-Servers should be listed in order of preference.
-.It Xo
-.Ic option ntp-servers Ar ip-address
-.Oo , Ar ip-address ... Oc ;
-.Xc
-This option specifies a list of IP addresses indicating NTP (RFC 1305)
-servers available to the client.
-Servers should be listed in order of preference.
-.It Xo
-.Ic option netbios-name-servers Ar ip-address
-.Oo , Ar ip-address ... Oc ;
-.Xc
-The NetBIOS name server (NBNS) option specifies a list of RFC 1001/1002
-NBNS name servers listed in order of preference.
-NetBIOS Name Service is currently more commonly referred to as WINS.
-WINS servers can be specified using the
-.Ic netbios-name-servers
-option.
-.It Xo
-.Ic option netbios-dd-server Ar ip-address
-.Oo , Ar ip-address ... Oc ;
-.Xc
-The NetBIOS datagram distribution server (NBDD) option specifies a
-list of RFC 1001/1002 NBDD servers listed in order of preference.
-.It Ic option netbios-node-type Ar uint8 ;
-The NetBIOS node type option allows NetBIOS over TCP/IP clients which
-are configurable to be configured as described in RFC 1001/1002.
-The value is specified as a single octet which identifies the client type.
-.Pp
-Possible node types are:
-.Bl -tag -width Ds
-.It 1
-B-node: Broadcast - no WINS
-.It 2
-P-node: Peer - WINS only
-.It 4
-M-node: Mixed - broadcast, then WINS
-.It 8
-H-node: Hybrid - WINS, then broadcast
-.El
-.It Ic option netbios-scope Ar string ;
-The NetBIOS scope option specifies the NetBIOS over TCP/IP scope
-parameter for the client as specified in RFC 1001/1002.
-See RFC 1001, RFC 1002, and RFC 1035 for character-set restrictions.
-.It Xo
-.Ic option font-servers Ar ip-address
-.Oo , Ar ip-address ... Oc ;
-.Xc
-This option specifies a list of X Window System Font servers available
-to the client.
-Servers should be listed in order of preference.
-.It Xo
-.Ic option x-display-manager Ar ip-address
-.Oo , Ar ip-address ... Oc ;
-.Xc
-This option specifies a list of systems that are running the X Window
-System Display Manager and are available to the client.
-Addresses should be listed in order of preference.
-.It Ic option dhcp-client-identifier Ar data-string ;
-This option can be used to specify a DHCP client identifier in a
-host declaration, so that
-.Xr dhcpd 8
-can find the host record by matching against the client identifier.
-.It Ic option nisplus-domain Ar string ;
-This option specifies the name of the client's NIS+ domain.
-The domain is formatted as a character string consisting of characters
-from the
-.Tn NVT ASCII
-character set.
-.It Xo
-.Ic option nisplus-servers Ar ip-address
-.Oo , Ar ip-address ... Oc ;
-.Xc
-This option specifies a list of IP addresses indicating NIS+ servers
-available to the client.
-Servers should be listed in order of preference.
-.It Ic option tftp-server-name Ar string ;
-This option is used to identify a TFTP server and, if supported by the
-client, should have the same effect as the
-.Ic server-name
-declaration.
-BOOTP clients are unlikely to support this option.
-Some DHCP clients will support it, and others actually require it.
-.It Ic option bootfile-name Ar string ;
-This option is used to identify a bootstrap file.
-If supported by the client, it should have the same effect as the
-.Ic filename
-declaration.
-BOOTP clients are unlikely to support this option.
-Some DHCP clients will support it, and others actually require it.
-.It Xo
-.Ic option mobile-ip-home-agent Ar ip-address
-.Oo , Ar ip-address ... Oc ;
-.Xc
-This option specifies a list of IP addresses indicating mobile IP
-home agents available to the client.
-Agents should be listed in order of preference, although normally there
-will be only one such agent.
-.It Xo
-.Ic option smtp-server Ar ip-address
-.Oo , Ar ip-address ... Oc ;
-.Xc
-The
-.Ic smtp-server
-option specifies a list of SMTP servers available to the client.
-Servers should be listed in order of preference.
-.It Xo
-.Ic option pop-server Ar ip-address
-.Oo , Ar ip-address ... Oc ;
-.Xc
-The
-.Ic pop-server
-option specifies a list of POP3 servers available to the client.
-Servers should be listed in order of preference.
-.It Xo
-.Ic option nntp-server Ar ip-address
-.Oo , Ar ip-address ... Oc ;
-.Xc
-The
-.Ic nntp-server
-option specifies a list of NNTP servers available to the client.
-Servers should be listed in order of preference.
-.It Xo
-.Ic option www-server Ar ip-address
-.Oo , Ar ip-address ... Oc ;
-.Xc
-The
-.Ic www-server
-option specifies a list of WWW servers available to the client.
-Servers should be listed in order of preference.
-.It Xo
-.Ic option finger-server Ar ip-address
-.Oo , Ar ip-address ... Oc ;
-.Xc
-The
-.Ic finger-server
-option specifies a list of
-.Xr finger 1
-servers available to the client.
-Servers should be listed in order of preference.
-.It Xo
-.Ic option irc-server Ar ip-address
-.Oo , Ar ip-address ... Oc ;
-.Xc
-The
-.Ic irc-server
-option specifies a list of IRC servers available to the client.
-Servers should be listed in order of preference.
-.It Xo
-.Ic option streettalk-server Ar ip-address
-.Oo , Ar ip-address ... Oc ;
-.Xc
-The
-.Ic streettalk-server
-option specifies a list of StreetTalk servers available to the client.
-Servers should be listed in order of preference.
-.It Xo
-.Ic option streettalk-directory-assistance-server Ar ip-address
-.Oo , Ar ip-address ... Oc ;
-.Xc
-The StreetTalk Directory Assistance (STDA) server option specifies a
-list of STDA servers available to the client.
-Servers should be listed in order of preference.
-.El
-.Sh SEE ALSO
-.Xr dhclient.conf 5 ,
-.Xr dhcpd.conf 5 ,
-.Xr dhcpd.leases 5 ,
-.Xr dhclient 8 ,
-.Xr dhcpd 8
-.Pp
-RFC 2131, RFC 2132.
-.Sh AUTHORS
-.An -nosplit
-.Xr dhcpd 8
-was written by
-.An Ted Lemon Aq mellon@vix.com
-under a contract with Vixie Labs.
-.Pp
-The current implementation was reworked by
-.An Henning Brauer Aq henning@openbsd.org .