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.Dd August 18, 2008 .Dt DHCPCD.CONF 5 SMM .Sh NAME .Nm dhcpcd.conf .Nd dhcpcd configuration file .Sh DESCRIPTION Although .Nm dhcpcd can do everything from the command line, there are cases where it's just easier to do it once in a configuration file. Most of the options found in .Xr dhcpcd 8 can be used here. The first word on the line is the option and the rest of the line is the value. Leading and trailing whitespace for the option and value are trimmed. You can escape characters in the value using the \ character.
p Blank lines and lines starting with # are ignored.
p Here's a list of available options: l -tag -width indent t Ic background Background immediately. This is useful for startup scripts which don't disable link messages for carrier status. t Ic clientid Ar string Change the default clientid sent from the interface hardware address. If the string is of the format 01:02:03 then it is encoded as hex. If not set then none is sent. t Ic duid Generate an .Rs .%T "RFC 4361" .Re compliant clientid. This requires persistent storage and not all DHCP servers work with it so it's not enabled by default. The duid generated will be held in
a @SYSCONFDIR@/dhcpcd.duid and should not be copied to other hosts. t Ic hostname Ar name Sends specified .Ar hostname to the DHCP server so it can be registered in DNS. If .Ar hostname if a FQDN (ie, contains a .) then it will be encoded as such. t Ic fqdn Op none | ptr | both none disables FQDN encoding, ptr just asks the DHCP server to update the PTR record of the host in DNS whereas both also updates the A record. The current hostname or the hostname specified using the c hostname option must be a FQDN. .Nm dhcpcd itself never does any DNS updates. .Nm dhcpcd encodes the FQDN hostname as specified in .Li RFC1035 . t Ic interface Ar interface Subsequent options are only parsed for this .Ar interface . t Ic leasetime Ar seconds Request a leasetime of .Ar seconds . t Ic noarp Don't send any ARP requests. This also disables IPv4LL. t Ic nogateway Don't install any default routes. t Ic nohook Ar script Don't run this hook script. Matches full name, or prefixed with 2 numbers optionally ending with
a .sh . t Ic noipv4ll Don't attempt to obtain an IPv4LL address if we failed to get one via DHCP. See .Rs .%T "RFC 3927" .Re t Ic nolink Don't receive link messages about carrier status. You should only set this for buggy interface drivers. t Ic option Ar option Requests the .Ar option from the server. It can be a variable to be used in .Xr dhcpcd-run-hooks 8 or the numerical value. You can specify more options seperated by commas, spaces or more option lines. t Ic require Ar option Requires the .Ar option to be present in all DHCP messages, otherwise the message is ignored. It can be a variable to be used in .Xr dhcpcd-run-hooks 8 or the numerical value. You can specify more options seperated by commas, spaces or more require lines. t Ic script Ar script Use .Ar script instead of the default
a @SCRIPT@ . t Ic timeout Ar seconds The default timeout for waiting for a DHCP response is 30 seconds which may be too long or too short and can be changed here. t Ic userclass Ar string Tag the DHCP messages with the userclass. You can specify more than one. t Ic vendor Ar code , Ns Ar value Add an enscapulated vendor option. .Ar code should be between 1 and 254 inclusive. Examples.
p Set the vendor option 01 with an IP address. .D1 vendor 01,192.168.0.2 Set the vendor option 02 with a hex code. .D1 vendor 02,01:02:03:04:05 Set the vendor option 03 with an IP address as a string. .D1 vendor 03,\e"192.168.0.2\e" t Ic vendorclassid Ar string Change the default vendorclassid sent from dhcpcd-version. If not set then none is sent. .El .Sh SEE ALSO .Xr dhcpcd-run-hooks 8 , .Xr dhcpcd 8 .Sh AUTHORS .An Roy Marples <roy@marples.name> .Sh BUGS Please report them to http://bugs.marples.name