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DHCP client lease database

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.
The lease file is named /var/db/dhclient.leases.IFNAME⟩, where “IFNAME” represents the network interface dhclient(8) acquired the lease on. For example, if dhclient(8) is configured for the em0 network device, the lease file will be named /var/db/dhclient.leases.em0,
The format of the lease declarations is described in dhclient.conf(5).

Current lease file.

dhclient.conf(5), dhcp-options(5), dhcpd.conf(5), dhclient(8), dhcpd(8)

R. Droms, Dynamic Host Configuration Protocol, RFC 2131, March 1997.
S. Alexander and R. Droms, DHCP Options and BOOTP Vendor Extensions, RFC 2132, March 1997.

dhclient(8) was written by Ted Lemon <mellon@vix.com> under a contract with Vixie Labs.
The current implementation was reworked by Henning Brauer <henning@openbsd.org>.
July 16, 2013 OpenBSD-5.5