dhclient.conf —
DHCP client configuration file
TABLE OF CONTENTS
dhclient.conf is the configuration file for
dhclient(8). It is a free-form
ASCII text file made up of declarations, extra tabs and newlines for
formatting purposes and comments. Keywords in the file are case-insensitive.
Comments begin with the ‘#’ character and extend to the end of
the current line.
-
-
backoff-cutoff
seconds;- Sets the maximum number of seconds to wait before retransmitting a packet.
The default is 10 seconds.
-
-
initial-interval
seconds;- Sets the number of seconds between the first packet transmission and the
first retransmission of the packet. The default is 1 second.
-
-
link-timeout
seconds;- Sets the number of seconds to wait for a lease before going into the
background as a daemon. The default is 10 seconds.
-
-
reboot
seconds;- Sets the number of seconds to wait before giving up on reacquiring the
previous lease, and how long to attempt unicast renewal requests before
falling back to broadcast renewal requests. The default is 1 second.
-
-
retry
seconds;- Sets the number of seconds to wait before starting a new attempt to obtain
a lease. The default is 1 second.
-
-
select-timeout
seconds;- Sets the number of seconds to wait for additional leases after the first
lease arrives. After
select-timeout
seconds the best lease received will be selected. The default is 0
seconds, i.e. immediately use the first acceptable lease received.
-
-
timeout
seconds;- Sets the number of seconds to wait for a lease. If no lease is received
the first valid lease in
dhclient.leases(5)
will be used. The default is 30 seonds.
-
-
append
option option-value;- Append option-value to the value of
option in the lease. Each
append for
option overrides any previous
append,
default,
ignore,
prepend or
supersede for
option.
-
-
default
option option-value;- If no value for option is present in the
lease use option-value. Each
default for
option overrides any previous
append,
default,
ignore,
prepend or
supersede for
option.
-
-
ignore
[option,
...
];- Discard values provided for the listed options.
ignore statements are cumulative,
except that an empty list will remove all previously specified options.
Each ignore for
option overrides any previous
append,
default,
prepend or
supersede for
option.
-
-
prepend
option option-value;- Prepend option-value to the value of
option in the lease. Each
prepend for
option overrides any previous
append,
default,
ignore,
prepend or
supersede for
option.
-
-
request
[option,
...
];- Ask that any lease contain values for the listed options.
request statements are cumulative,
except that an empty list will remove all previously specified options.
The default is to request the options bootfile-name broadcast-address,
classless-static-routes, host-name, domain-name, domain-name-servers,
domain-search, routers, subnet-mask, tftp-server-name and
time-offset.
-
-
require
[option,
...
];- Discard leases that do not contain the listed options.
require statements are cumulative,
except that an empty list will remove all previously specified
options.
-
-
send
option option-value;- Include option-value in requests for a
lease. To include multiple options in requests,
send can be used multiple times.
-
-
supersede
option option-value;- Use option-value for the given
option regardless of the value in the
lease. Each
supersede for
option overrides any previous
append,
default,
ignore,
prepend or
supersede for
option.
-
-
filename
path;- Use path instead of the
file field of the DHCP offer when
binding a lease.
-
-
fixed-address
ip-address;- Use ip-address instead of the
yiaddr field of the DHCP offer when
binding a lease.
-
-
interface
“name”
{ declaration;
...; }- Apply any declaration only to the named
interface.
-
-
reject
ip-address;- Discard leases from the specified address. If more than one
reject is present all leases from any
of the addresses will be discarded.
-
-
next-server
ip-address;- Use ip-address instead of the
siaddr field of the DHCP offer when
binding a lease.
-
-
server-name
host;- Use host instead of the
sname field of the DHCP offer when
binding a lease.
dhclient.leases(5),
dhcp-options(5),
dhcpd.conf(5),
dhclient(8),
dhcpd(8)
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