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.\" dhclient.8
.\"
.\" Copyright (c) 1997 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''.
.TH dhclient 8
.SH NAME
dhcpd - Dynamic Host Configuration Protocol Client
.SH SYNOPSIS
.B dhclient
[
.B -p
.I port
]
[
.B -d
]
[
.I if0
[
.I ...ifN
]
]
.SH DESCRIPTION
The Internet Software Consortium DHCP Client, dhclient, provides a
means for configuring one or more network interfaces using the Dynamic
Host Configuration Protocol, BOOTP protocol, or if these protocols
fail, by statically assigning an address.
.SH OPERATION
.PP
The DHCP protocol allows a host to contact a central server which
maintains a list of IP addresses which may be assigned on one or more
subnets. A DHCP client may request an address from this pool, and
then use it on a temporary basis for communication on network. The
DHCP protocol also provides a mechanism whereby a client can learn
important details about the network to which it is attached, such as
the location of a default router, the location of a name server, and
so on.
.PP
On startup, dhclient reads the
.IR dhclient.conf
for configuration instructions. It then gets a list of all the
network interfaces that are configured in the current system. For
each interface, it attempts to configure the interface using the DHCP
protocol.
.PP
In order to keep track of leases across system reboots and server
restarts, dhclient keeps a list of leases it has been assigned in the
dhclient.leases(5) file. On startup, after reading the dhclient.conf
file, dhclient reads the dhclient.leases file to refresh its memory
about what leases it has been assigned.
.PP
When a new lease is acquired, it is appended to the end of the
dhclient.leases file. In order to prevent the file from becoming
arbitrarily large, from time to time dhclient creates a new
dhclient.leases file from its in-core lease database. The old version
of the dhclient.leases file is retained under the name
.IR dhcpd.leases~
until the next time dhclient rewrites the database.
.PP
Old leases are kept around in case the DHCP server is unavailable when
dhclient is first invoked (generally during the initial system boot
process). In that event, old leases from the dhclient.leases file
which have not yet expired are tested, and if they are determined to
be valid, they are used until either they expire or the DHCP server
becomes available.
.PP
A mobile host which may sometimes need to access a network on which no
DHCP server exists may be preloaded with a lease for a fixed
address on that network. When all attempts to contact a DHCP server
have failed, dhclient will try to validate the static lease, and if it
succeeds, will use that lease until it is restarted.
.PP
A mobile host may also travel to some networks on which DHCP is not
available but BOOTP is. In that case, it may be advantageous to
arrange with the network administrator for an entry on the BOOTP
database, so that the host can boot quickly on that network rather
than cycling through the list of old leases.
.SH COMMAND LINE
.PP
The names of the network interfaces that dhclient should attempt to
configure may be specified on the command line. If no interface names
are specified on the command line dhclient will identify all network
interfaces, elimininating non-broadcast interfaces if possible, and
attempt to configure each interface.
.PP
If dhclient should listen and transmit on a port other than the
standard (port 68), the
.B -p
flag may used. It should be followed by the udp port number that
dhclient should use. This is mostly useful for debugging purposes.
.PP
Dhclient will normally run in the foreground until it has configured
an interface, and then will revert to running in the background.
To run force dhclient to always run as a foreground process, the
.B -d
flag should be specified. This is useful when running dhclient under
a debugger, or when running it out of inittab on System V systems.
.PP
.SH CONFIGURATION
The syntax of the dhclient.conf(8) file is discussed seperately.
.SH FILES
.B ETCDIR/dhclient.conf, DBDIR/dhclient.leases, RUNDIR/dhclient.pid,
.B DBDIR/dhclient.leases~.
.SH SEE ALSO
dhcpd(8), dhcrelay(8), dhclient.conf(5), dhclient.leases(5)
.SH AUTHOR
.B dhclient(8)
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
.B http://www.vix.com/isc.
To learn more about Vixie
Enterprises, see
.B http://www.vix.com.
.PP
This client was substantially modified and enhanced by Elliot Poger
for use on Linux while he was working on the MosquitoNet project at
Stanford.
.PP
The current version owes much to Elliot's Linux enhancements, but
was substantially reorganized and partially rewritten by Ted Lemon
so as to use the same networking framework that the Internet Software
Consortium DHCP server uses. Much system-specific configuration code
was moved into a shell script so that as support for more operating
systems is added, it will not be necessary to port and maintain
system-specific configuration code to these operating systems - instead,
the shell script can invoke the native tools to accomplish the same
purpose.
.PP

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dhclient(8) dhclient(8)
NNAAMMEE
dhcpd - Dynamic Host Configuration Protocol Client
SSYYNNOOPPSSIISS
ddhhcclliieenntt [ --pp _p_o_r_t ] [ --dd ] [ _i_f_0 [ _._._._i_f_N ] ]
DDEESSCCRRIIPPTTIIOONN
The Internet Software Consortium DHCP Client, dhclient,
provides a means for configuring one or more network
interfaces using the Dynamic Host Configuration Protocol,
BOOTP protocol, or if these protocols fail, by statically
assigning an address.
OOPPEERRAATTIIOONN
The DHCP protocol allows a host to contact a central
server which maintains a list of IP addresses which may be
assigned on one or more subnets. A DHCP client may
request an address from this pool, and then use it on a
temporary basis for communication on network. The DHCP
protocol also provides a mechanism whereby a client can
learn important details about the network to which it is
attached, such as the location of a default router, the
location of a name server, and so on.
On startup, dhclient reads the _d_h_c_l_i_e_n_t_._c_o_n_f for configu-
ration instructions. It then gets a list of all the net-
work interfaces that are configured in the current system.
For each interface, it attempts to configure the interface
using the DHCP protocol.
In order to keep track of leases across system reboots and
server restarts, dhclient keeps a list of leases it has
been assigned in the dhclient.leases(5) file. On
startup, after reading the dhclient.conf file, dhclient
reads the dhclient.leases file to refresh its memory about
what leases it has been assigned.
When a new lease is acquired, it is appended to the end of
the dhclient.leases file. In order to prevent the file
from becoming arbitrarily large, from time to time
dhclient creates a new dhclient.leases file from its in-
core lease database. The old version of the
dhclient.leases file is retained under the name
_d_h_c_p_d_._l_e_a_s_e_s_~ until the next time dhclient rewrites the
database.
Old leases are kept around in case the DHCP server is
unavailable when dhclient is first invoked (generally dur-
ing the initial system boot process). In that event, old
leases from the dhclient.leases file which have not yet
expired are tested, and if they are determined to be
valid, they are used until either they expire or the DHCP
server becomes available.
1
dhclient(8) dhclient(8)
A mobile host which may sometimes need to access a network
on which no DHCP server exists may be preloaded with a
lease for a fixed address on that network. When all
attempts to contact a DHCP server have failed, dhclient
will try to validate the static lease, and if it succeeds,
will use that lease until it is restarted.
A mobile host may also travel to some networks on which
DHCP is not available but BOOTP is. In that case, it may
be advantageous to arrange with the network administrator
for an entry on the BOOTP database, so that the host can
boot quickly on that network rather than cycling through
the list of old leases.
CCOOMMMMAANNDD LLIINNEE
The names of the network interfaces that dhclient should
attempt to configure may be specified on the command line.
If no interface names are specified on the command line
dhclient will identify all network interfaces, elimininat-
ing non-broadcast interfaces if possible, and attempt to
configure each interface.
If dhclient should listen and transmit on a port other
than the standard (port 68), the --pp flag may used. It
should be followed by the udp port number that dhclient
should use. This is mostly useful for debugging purposes.
Dhclient will normally run in the foreground until it has
configured an interface, and then will revert to running
in the background. To run force dhclient to always run as
a foreground process, the --dd flag should be specified.
This is useful when running dhclient under a debugger, or
when running it out of inittab on System V systems.
CCOONNFFIIGGUURRAATTIIOONN
The syntax of the dhclient.conf(8) file is discussed
seperately.
FFIILLEESS
//eettcc//ddhhcclliieenntt..ccoonnff,, //vvaarr//ddbb//ddhhcclliieenntt..lleeaasseess,,
//vvaarr//rruunn//ddhhcclliieenntt..ppiidd,, //vvaarr//ddbb//ddhhcclliieenntt..lleeaasseess~~..
SSEEEE AALLSSOO
dhcpd(8), dhcrelay(8), dhclient.conf(5),
dhclient.leases(5)
AAUUTTHHOORR
ddhhcclliieenntt((88)) 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 hhttttpp::////wwwwww..vviixx..ccoomm//iisscc.. To learn
more about Vixie Enterprises, see hhttttpp::////wwwwww..vviixx..ccoomm..
2
dhclient(8) dhclient(8)
This client was substantially modified and enhanced by
Elliot Poger for use on Linux while he was working on the
MosquitoNet project at Stanford.
The current version owes much to Elliot's Linux enhance-
ments, but was substantially reorganized and partially
rewritten by Ted Lemon so as to use the same networking
framework that the Internet Software Consortium DHCP
server uses. Much system-specific configuration code was
moved into a shell script so that as support for more
operating systems is added, it will not be necessary to
port and maintain system-specific configuration code to
these operating systems - instead, the shell script can
invoke the native tools to accomplish the same purpose.
3

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.\" dhclient.conf.5
.\"
.\" Copyright (c) 1997 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''.
.TH dhcpd.conf 5
.SH NAME
dhclient.conf - DHCP client configuration file
.SH DESCRIPTION
The dhclient.conf file contains configuration information for
.IR dhclient,
the Internet Software Consortium DHCP Client.
.PP
The dhclient.conf file is a free-form ASCII text file. It is parsed by
the recursive-descent parser built into dhclient. The file may contain
extra tabs and newlines for formatting purposes. Keywords in the file
are case-insensitive. Comments may be placed anywhere within the
file (except within quotes). Comments begin with the # character and
end at the end of the line.
.PP
\fBTHIS DOCUMENTATION IS NOT YET COMPLETE - SORRY\fR
.SH SEE ALSO
dhcpd.conf(5), dhclient.leases(5),
draft-ietf-dhc-options-1533update-04.txt, draft-ietf-dhc-dhcp-07.txt.
.SH AUTHOR
.B dhclient(8)
was written by Ted Lemon <mellon@vix.com>
under a contract with Vixie Labs. Funding
for this project was provided by the Internet Software Corporation.
Information about the Internet Software Consortium can be found at
.B http://www.isc.org/isc.

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.\" dhclient.8
.\"
.\" Copyright (c) 1997 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''.
.TH dhclient 8
.SH NAME
dhcpd - Dynamic Host Configuration Protocol Client
.SH SYNOPSIS
.B dhclient
[
.B -p
.I port
]
[
.B -d
]
[
.I if0
[
.I ...ifN
]
]
.SH DESCRIPTION
The Internet Software Consortium DHCP Client, dhclient, provides a
means for configuring one or more network interfaces using the Dynamic
Host Configuration Protocol, BOOTP protocol, or if these protocols
fail, by statically assigning an address.
.SH OPERATION
.PP
The DHCP protocol allows a host to contact a central server which
maintains a list of IP addresses which may be assigned on one or more
subnets. A DHCP client may request an address from this pool, and
then use it on a temporary basis for communication on network. The
DHCP protocol also provides a mechanism whereby a client can learn
important details about the network to which it is attached, such as
the location of a default router, the location of a name server, and
so on.
.PP
On startup, dhclient reads the
.IR dhclient.conf
for configuration instructions. It then gets a list of all the
network interfaces that are configured in the current system. For
each interface, it attempts to configure the interface using the DHCP
protocol.
.PP
In order to keep track of leases across system reboots and server
restarts, dhclient keeps a list of leases it has been assigned in the
dhclient.leases(5) file. On startup, after reading the dhclient.conf
file, dhclient reads the dhclient.leases file to refresh its memory
about what leases it has been assigned.
.PP
When a new lease is acquired, it is appended to the end of the
dhclient.leases file. In order to prevent the file from becoming
arbitrarily large, from time to time dhclient creates a new
dhclient.leases file from its in-core lease database. The old version
of the dhclient.leases file is retained under the name
.IR dhcpd.leases~
until the next time dhclient rewrites the database.
.PP
Old leases are kept around in case the DHCP server is unavailable when
dhclient is first invoked (generally during the initial system boot
process). In that event, old leases from the dhclient.leases file
which have not yet expired are tested, and if they are determined to
be valid, they are used until either they expire or the DHCP server
becomes available.
.PP
A mobile host which may sometimes need to access a network on which no
DHCP server exists may be preloaded with a lease for a fixed
address on that network. When all attempts to contact a DHCP server
have failed, dhclient will try to validate the static lease, and if it
succeeds, will use that lease until it is restarted.
.PP
A mobile host may also travel to some networks on which DHCP is not
available but BOOTP is. In that case, it may be advantageous to
arrange with the network administrator for an entry on the BOOTP
database, so that the host can boot quickly on that network rather
than cycling through the list of old leases.
.SH COMMAND LINE
.PP
The names of the network interfaces that dhclient should attempt to
configure may be specified on the command line. If no interface names
are specified on the command line dhclient will identify all network
interfaces, elimininating non-broadcast interfaces if possible, and
attempt to configure each interface.
.PP
If dhclient should listen and transmit on a port other than the
standard (port 68), the
.B -p
flag may used. It should be followed by the udp port number that
dhclient should use. This is mostly useful for debugging purposes.
.PP
Dhclient will normally run in the foreground until it has configured
an interface, and then will revert to running in the background.
To run force dhclient to always run as a foreground process, the
.B -d
flag should be specified. This is useful when running dhclient under
a debugger, or when running it out of inittab on System V systems.
.PP
.SH CONFIGURATION
The syntax of the dhclient.conf(8) file is discussed seperately.
.SH FILES
.B ETCDIR/dhclient.conf, DBDIR/dhclient.leases, RUNDIR/dhclient.pid,
.B DBDIR/dhclient.leases~.
.SH SEE ALSO
dhcpd(8), dhcrelay(8), dhclient.conf(5), dhclient.leases(5)
.SH AUTHOR
.B dhclient(8)
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
.B http://www.vix.com/isc.
To learn more about Vixie
Enterprises, see
.B http://www.vix.com.
.PP
This client was substantially modified and enhanced by Elliot Poger
for use on Linux while he was working on the MosquitoNet project at
Stanford.
.PP
The current version owes much to Elliot's Linux enhancements, but
was substantially reorganized and partially rewritten by Ted Lemon
so as to use the same networking framework that the Internet Software
Consortium DHCP server uses. Much system-specific configuration code
was moved into a shell script so that as support for more operating
systems is added, it will not be necessary to port and maintain
system-specific configuration code to these operating systems - instead,
the shell script can invoke the native tools to accomplish the same
purpose.
.PP

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dhclient(8) dhclient(8)
NNAAMMEE
dhcpd - Dynamic Host Configuration Protocol Client
SSYYNNOOPPSSIISS
ddhhcclliieenntt [ --pp _p_o_r_t ] [ --dd ] [ _i_f_0 [ _._._._i_f_N ] ]
DDEESSCCRRIIPPTTIIOONN
The Internet Software Consortium DHCP Client, dhclient,
provides a means for configuring one or more network
interfaces using the Dynamic Host Configuration Protocol,
BOOTP protocol, or if these protocols fail, by statically
assigning an address.
OOPPEERRAATTIIOONN
The DHCP protocol allows a host to contact a central
server which maintains a list of IP addresses which may be
assigned on one or more subnets. A DHCP client may
request an address from this pool, and then use it on a
temporary basis for communication on network. The DHCP
protocol also provides a mechanism whereby a client can
learn important details about the network to which it is
attached, such as the location of a default router, the
location of a name server, and so on.
On startup, dhclient reads the _d_h_c_l_i_e_n_t_._c_o_n_f for configu-
ration instructions. It then gets a list of all the net-
work interfaces that are configured in the current system.
For each interface, it attempts to configure the interface
using the DHCP protocol.
In order to keep track of leases across system reboots and
server restarts, dhclient keeps a list of leases it has
been assigned in the dhclient.leases(5) file. On
startup, after reading the dhclient.conf file, dhclient
reads the dhclient.leases file to refresh its memory about
what leases it has been assigned.
When a new lease is acquired, it is appended to the end of
the dhclient.leases file. In order to prevent the file
from becoming arbitrarily large, from time to time
dhclient creates a new dhclient.leases file from its in-
core lease database. The old version of the
dhclient.leases file is retained under the name
_d_h_c_p_d_._l_e_a_s_e_s_~ until the next time dhclient rewrites the
database.
Old leases are kept around in case the DHCP server is
unavailable when dhclient is first invoked (generally dur-
ing the initial system boot process). In that event, old
leases from the dhclient.leases file which have not yet
expired are tested, and if they are determined to be
valid, they are used until either they expire or the DHCP
server becomes available.
1
dhclient(8) dhclient(8)
A mobile host which may sometimes need to access a network
on which no DHCP server exists may be preloaded with a
lease for a fixed address on that network. When all
attempts to contact a DHCP server have failed, dhclient
will try to validate the static lease, and if it succeeds,
will use that lease until it is restarted.
A mobile host may also travel to some networks on which
DHCP is not available but BOOTP is. In that case, it may
be advantageous to arrange with the network administrator
for an entry on the BOOTP database, so that the host can
boot quickly on that network rather than cycling through
the list of old leases.
CCOOMMMMAANNDD LLIINNEE
The names of the network interfaces that dhclient should
attempt to configure may be specified on the command line.
If no interface names are specified on the command line
dhclient will identify all network interfaces, elimininat-
ing non-broadcast interfaces if possible, and attempt to
configure each interface.
If dhclient should listen and transmit on a port other
than the standard (port 68), the --pp flag may used. It
should be followed by the udp port number that dhclient
should use. This is mostly useful for debugging purposes.
Dhclient will normally run in the foreground until it has
configured an interface, and then will revert to running
in the background. To run force dhclient to always run as
a foreground process, the --dd flag should be specified.
This is useful when running dhclient under a debugger, or
when running it out of inittab on System V systems.
CCOONNFFIIGGUURRAATTIIOONN
The syntax of the dhclient.conf(8) file is discussed
seperately.
FFIILLEESS
//eettcc//ddhhcclliieenntt..ccoonnff,, //vvaarr//ddbb//ddhhcclliieenntt..lleeaasseess,,
//vvaarr//rruunn//ddhhcclliieenntt..ppiidd,, //vvaarr//ddbb//ddhhcclliieenntt..lleeaasseess~~..
SSEEEE AALLSSOO
dhcpd(8), dhcrelay(8), dhclient.conf(5),
dhclient.leases(5)
AAUUTTHHOORR
ddhhcclliieenntt((88)) 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 hhttttpp::////wwwwww..vviixx..ccoomm//iisscc.. To learn
more about Vixie Enterprises, see hhttttpp::////wwwwww..vviixx..ccoomm..
2
dhclient(8) dhclient(8)
This client was substantially modified and enhanced by
Elliot Poger for use on Linux while he was working on the
MosquitoNet project at Stanford.
The current version owes much to Elliot's Linux enhance-
ments, but was substantially reorganized and partially
rewritten by Ted Lemon so as to use the same networking
framework that the Internet Software Consortium DHCP
server uses. Much system-specific configuration code was
moved into a shell script so that as support for more
operating systems is added, it will not be necessary to
port and maintain system-specific configuration code to
these operating systems - instead, the shell script can
invoke the native tools to accomplish the same purpose.
3

63
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@ -0,0 +1,63 @@
.\" dhclient.conf.5
.\"
.\" Copyright (c) 1997 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''.
.TH dhcpd.conf 5
.SH NAME
dhclient.conf - DHCP client configuration file
.SH DESCRIPTION
The dhclient.conf file contains configuration information for
.IR dhclient,
the Internet Software Consortium DHCP Client.
.PP
The dhclient.conf file is a free-form ASCII text file. It is parsed by
the recursive-descent parser built into dhclient. The file may contain
extra tabs and newlines for formatting purposes. Keywords in the file
are case-insensitive. Comments may be placed anywhere within the
file (except within quotes). Comments begin with the # character and
end at the end of the line.
.PP
\fBTHIS DOCUMENTATION IS NOT YET COMPLETE - SORRY\fR
.SH SEE ALSO
dhcpd.conf(5), dhclient.leases(5),
draft-ietf-dhc-options-1533update-04.txt, draft-ietf-dhc-dhcp-07.txt.
.SH AUTHOR
.B dhclient(8)
was written by Ted Lemon <mellon@vix.com>
under a contract with Vixie Labs. Funding
for this project was provided by the Internet Software Corporation.
Information about the Internet Software Consortium can be found at
.B http://www.isc.org/isc.

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.\" dhcrelay.8
.\"
.\" Copyright (c) 1997 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''.
.TH dhcrelay 8
.SH NAME
dhcpd - Dynamic Host Configuration Protocol Relay Agent
.SH SYNOPSIS
.B dhcrelay
[
.B -p
.I port
]
[
.B -d
]
[
.B -i
.I if0
[
.B ...
.B -i
.I ifN
]
]
.I server0
[
.I ...serverN
]
.SH DESCRIPTION
The Internet Software Consortium DHCP Relay Agent, dhcrelay, provides a
means for relaying DHCP and BOOTP requests from a subnet to which
no DHCP server is directly to one or more DHCP servers on other
subnets.
.SH OPERATION
.PP
The DHCP Relay Agent listens for DHCP requests on all interfaces
attached to a host, or only on those interfaces specified on the
command line with the
.I -i
flag. When a query is received, it forwards it to the list of DHCP
servers specified on the command line. When a reply is received, it
is broadcast or unicast on the network from whence the original
request came.
.PP
It is possible to specify a set of interfaces on which dhcrelay will
listen, so that if dhcrelay is connected through one interface to a
network on which there is no DHCP server, but is connected on another
interface to a network on which there is a DHCP server, it will not
relay DHCP and BOOTP requests from the network on which the server
exists to that server. This is an imperfect solution.
.SH COMMAND LINE
.PP
The names of the network interfaces that dhcrelay should attempt to
configure may be specified on the command line using the
.I -i
option. If no interface names
are specified on the command line dhcrelay will identify all network
interfaces, elimininating non-broadcast interfaces if possible, and
attempt to configure each interface.
.PP
If dhcrelay should listen and transmit on a port other than the
standard (port 67), the
.B -p
flag may used. It should be followed by the udp port number that
dhcrelay should use. This is mostly useful for debugging purposes.
.PP
Dhclient will normally run in the foreground until it has configured
an interface, and then will revert to running in the background.
To run force dhcrelay to always run as a foreground process, the
.B -d
flag should be specified. This is useful when running dhcrelay under
a debugger, or when running it out of inittab on System V systems.
.PP
The name of at least one DHCP server to which DHCP and BOOTP requests
should be relayed must be specified on the command line.
.PP
.SH SEE ALSO
dhclient(8), dhcpd(8), dhcrelay.conf(5), dhcrelay.leases(5)
.SH AUTHOR
.B dhcrelay(8)
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
.B http://www.vix.com/isc.
To learn more about Vixie
Enterprises, see
.B http://www.vix.com.
.PP

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dhcrelay(8) dhcrelay(8)
NNAAMMEE
dhcpd - Dynamic Host Configuration Protocol Relay Agent
SSYYNNOOPPSSIISS
ddhhccrreellaayy [ --pp _p_o_r_t ] [ --dd ] [ --ii _i_f_0 [ ...... --ii _i_f_N ] ]
_s_e_r_v_e_r_0 [ _._._._s_e_r_v_e_r_N ]
DDEESSCCRRIIPPTTIIOONN
The Internet Software Consortium DHCP Relay Agent, dhcre-
lay, provides a means for relaying DHCP and BOOTP requests
from a subnet to which no DHCP server is directly to one
or more DHCP servers on other subnets.
OOPPEERRAATTIIOONN
The DHCP Relay Agent listens for DHCP requests on all
interfaces attached to a host, or only on those interfaces
specified on the command line with the _-_i flag. When a
query is received, it forwards it to the list of DHCP
servers specified on the command line. When a reply is
received, it is broadcast or unicast on the network from
whence the original request came.
It is possible to specify a set of interfaces on which
dhcrelay will listen, so that if dhcrelay is connected
through one interface to a network on which there is no
DHCP server, but is connected on another interface to a
network on which there is a DHCP server, it will not relay
DHCP and BOOTP requests from the network on which the
server exists to that server. This is an imperfect solu-
tion.
CCOOMMMMAANNDD LLIINNEE
The names of the network interfaces that dhcrelay should
attempt to configure may be specified on the command line
using the _-_i option. If no interface names are specified
on the command line dhcrelay will identify all network
interfaces, elimininating non-broadcast interfaces if pos-
sible, and attempt to configure each interface.
If dhcrelay should listen and transmit on a port other
than the standard (port 67), the --pp flag may used. It
should be followed by the udp port number that dhcrelay
should use. This is mostly useful for debugging purposes.
Dhclient will normally run in the foreground until it has
configured an interface, and then will revert to running
in the background. To run force dhcrelay to always run as
a foreground process, the --dd flag should be specified.
This is useful when running dhcrelay under a debugger, or
when running it out of inittab on System V systems.
The name of at least one DHCP server to which DHCP and
BOOTP requests should be relayed must be specified on the
command line.
1
dhcrelay(8) dhcrelay(8)
SSEEEE AALLSSOO
dhclient(8), dhcpd(8), dhcrelay.conf(5), dhcre-
lay.leases(5)
AAUUTTHHOORR
ddhhccrreellaayy((88)) 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 hhttttpp::////wwwwww..vviixx..ccoomm//iisscc.. To learn
more about Vixie Enterprises, see hhttttpp::////wwwwww..vviixx..ccoomm..
2

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@ -0,0 +1,123 @@
.\" dhcrelay.8
.\"
.\" Copyright (c) 1997 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''.
.TH dhcrelay 8
.SH NAME
dhcpd - Dynamic Host Configuration Protocol Relay Agent
.SH SYNOPSIS
.B dhcrelay
[
.B -p
.I port
]
[
.B -d
]
[
.B -i
.I if0
[
.B ...
.B -i
.I ifN
]
]
.I server0
[
.I ...serverN
]
.SH DESCRIPTION
The Internet Software Consortium DHCP Relay Agent, dhcrelay, provides a
means for relaying DHCP and BOOTP requests from a subnet to which
no DHCP server is directly to one or more DHCP servers on other
subnets.
.SH OPERATION
.PP
The DHCP Relay Agent listens for DHCP requests on all interfaces
attached to a host, or only on those interfaces specified on the
command line with the
.I -i
flag. When a query is received, it forwards it to the list of DHCP
servers specified on the command line. When a reply is received, it
is broadcast or unicast on the network from whence the original
request came.
.PP
It is possible to specify a set of interfaces on which dhcrelay will
listen, so that if dhcrelay is connected through one interface to a
network on which there is no DHCP server, but is connected on another
interface to a network on which there is a DHCP server, it will not
relay DHCP and BOOTP requests from the network on which the server
exists to that server. This is an imperfect solution.
.SH COMMAND LINE
.PP
The names of the network interfaces that dhcrelay should attempt to
configure may be specified on the command line using the
.I -i
option. If no interface names
are specified on the command line dhcrelay will identify all network
interfaces, elimininating non-broadcast interfaces if possible, and
attempt to configure each interface.
.PP
If dhcrelay should listen and transmit on a port other than the
standard (port 67), the
.B -p
flag may used. It should be followed by the udp port number that
dhcrelay should use. This is mostly useful for debugging purposes.
.PP
Dhclient will normally run in the foreground until it has configured
an interface, and then will revert to running in the background.
To run force dhcrelay to always run as a foreground process, the
.B -d
flag should be specified. This is useful when running dhcrelay under
a debugger, or when running it out of inittab on System V systems.
.PP
The name of at least one DHCP server to which DHCP and BOOTP requests
should be relayed must be specified on the command line.
.PP
.SH SEE ALSO
dhclient(8), dhcpd(8), dhcrelay.conf(5), dhcrelay.leases(5)
.SH AUTHOR
.B dhcrelay(8)
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
.B http://www.vix.com/isc.
To learn more about Vixie
Enterprises, see
.B http://www.vix.com.
.PP

132
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@ -0,0 +1,132 @@
dhcrelay(8) dhcrelay(8)
NNAAMMEE
dhcpd - Dynamic Host Configuration Protocol Relay Agent
SSYYNNOOPPSSIISS
ddhhccrreellaayy [ --pp _p_o_r_t ] [ --dd ] [ --ii _i_f_0 [ ...... --ii _i_f_N ] ]
_s_e_r_v_e_r_0 [ _._._._s_e_r_v_e_r_N ]
DDEESSCCRRIIPPTTIIOONN
The Internet Software Consortium DHCP Relay Agent, dhcre-
lay, provides a means for relaying DHCP and BOOTP requests
from a subnet to which no DHCP server is directly to one
or more DHCP servers on other subnets.
OOPPEERRAATTIIOONN
The DHCP Relay Agent listens for DHCP requests on all
interfaces attached to a host, or only on those interfaces
specified on the command line with the _-_i flag. When a
query is received, it forwards it to the list of DHCP
servers specified on the command line. When a reply is
received, it is broadcast or unicast on the network from
whence the original request came.
It is possible to specify a set of interfaces on which
dhcrelay will listen, so that if dhcrelay is connected
through one interface to a network on which there is no
DHCP server, but is connected on another interface to a
network on which there is a DHCP server, it will not relay
DHCP and BOOTP requests from the network on which the
server exists to that server. This is an imperfect solu-
tion.
CCOOMMMMAANNDD LLIINNEE
The names of the network interfaces that dhcrelay should
attempt to configure may be specified on the command line
using the _-_i option. If no interface names are specified
on the command line dhcrelay will identify all network
interfaces, elimininating non-broadcast interfaces if pos-
sible, and attempt to configure each interface.
If dhcrelay should listen and transmit on a port other
than the standard (port 67), the --pp flag may used. It
should be followed by the udp port number that dhcrelay
should use. This is mostly useful for debugging purposes.
Dhclient will normally run in the foreground until it has
configured an interface, and then will revert to running
in the background. To run force dhcrelay to always run as
a foreground process, the --dd flag should be specified.
This is useful when running dhcrelay under a debugger, or
when running it out of inittab on System V systems.
The name of at least one DHCP server to which DHCP and
BOOTP requests should be relayed must be specified on the
command line.
1
dhcrelay(8) dhcrelay(8)
SSEEEE AALLSSOO
dhclient(8), dhcpd(8), dhcrelay.conf(5), dhcre-
lay.leases(5)
AAUUTTHHOORR
ddhhccrreellaayy((88)) 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 hhttttpp::////wwwwww..vviixx..ccoomm//iisscc.. To learn
more about Vixie Enterprises, see hhttttpp::////wwwwww..vviixx..ccoomm..
2