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-.\" $OpenBSD: dhclient.leases.5,v 1.14 2017/12/18 14:17:58 krw Exp $
-.\"
-.\" 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''.
-.\"
-.Dd $Mdocdate: December 18 2017 $
-.Dt DHCLIENT.LEASES 5
-.Os
-.Sh NAME
-.Nm dhclient.leases
-.Nd DHCP client lease database
-.Sh DESCRIPTION
-.Xr dhclient 8
-keeps a persistent database of leases that it has acquired that are still
-valid.
-The database is a free-form ASCII file containing one valid declaration
-per lease.
-The file is written as a log, so the last declaration is the most recent
-lease obtained.
-.Pp
-The lease file is named
-.Pa /var/db/dhclient.leases . Ns Aq Ar IFNAME ,
-where
-.Qq IFNAME
-represents the network interface
-.Xr dhclient 8
-acquired the lease on.
-For example, if
-.Xr dhclient 8
-is configured for the em0 network device,
-the lease file will be named
-.Pa /var/db/dhclient.leases.em0 ,
-.Pp
-A lease statement has the format
-.Pp
-.D1 Ic lease No { Ar lease-declaration ; ... ; No }
-.Pp
-Where
-.Ar lease\-declaration
-is one of:
-.Pp
-.Bl -tag -width Ds -compact
-.It Ic bootp
-The lease was acquired using the
-BOOTP protocol rather than the DHCP protocol.
-.Pp
-.It Ic epoch
-The
-.Xr time 3
-when the lease was obtained.
-This value is used to convert the values of the DHCP options
-.Ic dhcp-lease-time ,
-.Ic dhcp-renewal-time ,
-and
-.Ic dhcp-rebinding-time
-to times.
-A value of 0 will cause
-.Ic epoch
-to be set to the current time when
-.Nm
-is processed.
-.Pp
-.It Ic expire Ar date
-.It Ic rebind Ar date
-.It Ic renew Ar date
-.Ic expire
-is when
-.Xr dhclient 8
-will no longer use the lease to configure the interface.
-.Ic rebind
-is when
-.Xr dhclient 8
-will begin trying to renew the lease with broadcasts to any server.
-.Ic renew
-is when
-.Xr dhclient 8
-will begin trying to renew the lease with unicasts to the originating server.
-.Pp
-Dates are specified in accordance with the
-.Xr strptime 3
-format:
-.Pp
-.D1 %w %Y/%m/%d \&%T UTC
-.Pp
-For example:
-.Pp
-.Dl renew 1 2017/10/16 14:03:49 UTC
-.Pp
-.Ic expire ,
-.Ic rebind ,
-.Ic renew
-are just comments that are ignored when processing
-.Nm .
-The values used by
-.Xr dhclient 8
-are always recalculated based on
-.Ic epoch
-when
-.Nm
-is processed.
-.Pp
-.It Ic filename Qq Ar string
-The boot filename.
-.Pp
-.It Ic fixed-address Ar ip-address
-The IPv4 address of the lease.
-This is required for all lease statements.
-The IPv4 address is specified as a dotted quad (e.g. 12.34.56.78).
-.Pp
-.It Ic next-server Ar ip-address
-The IPv4 address of the boot server.
-The IPv4 address is specified as a dotted quad (e.g. 12.34.56.78).
-.Pp
-.It Ic option Ar option option-value
-The value of
-.Ar option .
-DHCP options are described in
-.Xr dhcp-options 5 .
-.Pp
-.It Ic server-name Qq Ar string
-The name of the boot server.
-.Pp
-.It Ic ssid Qq Ar string
-The SSID to which the lease applies.
-.El
-.Sh FILES
-.Bl -tag -width "/var/db/dhclient.leases.IFNAME "
-.It Pa /var/db/dhclient.leases . Ns Aq Ar IFNAME
-Persistent database of leases for
-.Aq Ar IFNAME .
-.El
-.Sh SEE ALSO
-.Xr dhclient.conf 5 ,
-.Xr dhcp-options 5 ,
-.Xr dhcpd.conf 5 ,
-.Xr dhclient 8 ,
-.Xr dhcpd 8