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-.TH UDHCPC 8 2001-09-26 GNU/Linux "GNU/Linux Administrator's Manual"
-.SH NAME
-udhcpc \- very small DHCP client
-.SH SYNOPSIS
-.B udhcpc
-.RI [ OPTION ]...
-.SH DESCRIPTION
-The udhcp client negotiates a lease with the DHCP server and
-executes a script when it is obtained or lost.
-.SH OPTIONS
-.TP
-.BI \-c\ CLIENTID ,\ \-\-clientid= CLIENTID
-Send the client identifier
-.IR CLIENTID .
-.TP
-.BR -f ,\ \-\-foreground
-Do not fork after obtaining a lease.
-.TP
-.BI \-H\ HOSTNAME ,\ \-\-hostname= HOSTNAME
-Send the client hostname
-.IR HOSTNAME .
-.TP
-.BI \-h\ HOSTNAME
-Alias for -H
-.IR HOSTNAME .
-.TP
-.BI \-i\ INTERFACE ,\ \-\-interface= INTERFACE
-Configure
-.IR INTERFACE .
-.TP
-.BR -n ,\ \-\-now
-Exit with failure if a lease cannot be obtained.
-.TP
-.BI \-p\ FILE ,\ \-\-pidfile= FILE
-Write the process ID of the daemon to
-.IR FILE .
-.TP
-.BR -q ,\ \-\-quit
-Exit after obtaining a lease.
-.TP
-.BI \-r\ ADDRESS ,\ \-\-request= ADDRESS
-Request IP address
-.IR ADDRESS .
-.TP
-.BI \-s\ FILE ,\ \-\-script= FILE
-Use script
-.IR FILE .
-.TP
-.BR -v ,\ \-\-version
-Display version.
-.SH USAGE
-When an event occurs,
-.B udhcpc
-executes a script. There are four possible arguments to this
-script:
-.TP
-.B deconfig
-.B deconfig
-is used when
-.B udhcpc
-starts, and when a lease is lost. The script should put the
-interface in an up, but deconfigured, state.
-.TP
-.B bound
-.B bound
-is used when
-.B udhcpc
-moves from an unbound to a bound state. The script should
-configure the interface and set any other relevant parameters
-(e.g., default gateway, dns server, etc.).
-.TP
-.B renew
-.B renew
-is used when
-.B udhcpc
-when a lease is renewed. The interface is already
-configured, so the IP address will not change. Other parameters
-(e.g., default gateway, subnet mask, dns server) may.
-.TP
-.B nak
-.B nak
-is used when
-.B udhcpc
-receieves a NAK packet from the server. The
-enviromental variable
-.B $message
-will contain the reason for the
-NAK message if the server included one. Processing this message
-is optional, as the script will also be called with deconfig if
-need be.
-.PP
-Parameters are passed to the script via the following environment
-variables:
-.TP
-.B HOME
-The inherited HOME, or "/" if it is unset.
-.TP
-.B PATH
-The inherited PATH, or "/bin:/usr/bin:/sbin:/usr/sbin" if it is
-unset.
-.TP
-.B interface
-The interface.
-.TP
-.B ip
-The client IP address.
-.TP
-.B siaddr
-The BOOTP next server option.
-.TP
-.B sname
-The BOOTP server name option.
-.TP
-.B boot_file
-The BOOTP boot file option.
-.TP
-.B subnet
-The subnet mask.
-.TP
-.B timezone
-The timezone offset from UTC in seconds.
-.TP
-.B router
-The list of routers.
-.TP
-.B timesvr
-The list of time servers.
-.TP
-.B namesvr
-The list of IEN 116 name servers.
-.TP
-.B dns
-The list of DNS servers.
-.TP
-.B logsvr
-The list of MIT-LCS UDP log servers.
-.TP
-.B cookiesvr
-The list of RFC 865 cookie servers.
-.TP
-.B lprsvr
-The list of LPR servers.
-.TP
-.B hostname
-The host name.
-.TP
-.B bootsize
-The length in 512-octet blocks of the bootfile.
-.TP
-.B domain
-The domain name of the network.
-.TP
-.B swapsvr
-The client's swap server.
-.TP
-.B rootpath
-The path of the client's root dist.
-.TP
-.B ipttl
-The TTL.
-.TP
-.B mtu
-The MTU.
-.TP
-.B broadcast
-The broadcast address.
-.TP
-.B ntpsrv
-The list of NTP servers.
-.TP
-.B wins
-The list of WINS servers.
-.TP
-.B lease
-The lease time in seconds.
-.TP
-.B dhcptype
-The DHCP message type (safely ignored).
-.TP
-.B serverid
-The server IP address.
-.TP
-.B message
-Reason for a DHCPNAK.
-.TP
-.B tftp
-The TFTP server name.
-.TP
-.B bootfile
-The bootfile name.
-.SH FILES
-.TP
-.I /usr/share/udhcpc/default.script
-Script run when leases are obtained or lost.
-.SH NOTES
-.B udhcpc
-responds to the following signals:
-.TP
-.B SIGUSR1
-This signal causes
-.B udhcpc
-to renew the current lease or, if it does not have one, obtain a
-new lease.
-.TP
-.B SIGUSR2
-This signal caused
-.B udhcpc
-to release the current lease.