Linux DHCP Release on boot

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DHCP Release/Renew

Are there any UNIX commands that will release and renew a DHCP lease? If not, is there a third party utility that would do this?

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dhcpparm

dhcpparm(8)						      System Manager's Manual						       dhcpparm(8)

NAME

       dhcpparm - Daemon for client configuration

SYNOPSIS

       /usr/sbin/dhcpparm [-i interface] tag | symbol | name

OPTIONS

       Use  this  option  on  hardware	that  has two or more interfaces configurable by the Dynamic Host Configuration Protocol (DHCP), and for a
       parameter that is interface specific. When no interface is specified, the client daemon returns the name of the first interface it finds on
       which DHCP has successfully completed: the value(s) displayed will be those of the configuration received on that interface.

DESCRIPTION

       The  dhcpparm  command  displays the value(s) of the parameter requested on the command line as supplied by the DHCP protocol.  If the DHCP
       parameter implies more than one value (for example, a list of gateways), the values are displayed  separated  by  newline  characters.  The
       parameter  may  be identified either by its numeric value in the DHCP protocol, by its two character symbol, or by its long name. The dhcp-
       parm command is intended to be used in command substitutions in the shell scripts invoked by init at system boot.  It  first  contacts  the
       DHCP  client daemon (joinc) to verify that DHCP has successfully completed. When the -i option specifies a particular interface, the daemon
       verifies successful DHCP configuration of that interface; otherwise, the client verifies that at least one interface is	successfully  con-
       figured, and supplies the name of that interface to dhcpparm.  Parameter values echoed by dhcpparm should not be used without checking exit
       status. See the EXIT STATUS section below.

RESTRICTIONS

       A cluster member should never be a DHCP client; it should always use static addressing.

       If a cluster is to support a DHCP server, there can only be one DHCP server for all the	cluster  members  using  a  common  database  with
       failover.

       If  a  cluster  is  to  support	a  DHCP server, there can only be one DHCP server for all the cluster members using a common database with
       failover.

       DHCP client is not supported on dataless clients.

SYMBOLS

       See dhcptags(4) for the list of two letter symbol codes and names of all DHCP parameters. See RFC 1533 for more detail.

EXIT STATUS

       Exit codes are as follows: Success.  DHCP was not successful. The DHCP client daemon may not be running, the interface might have failed to
       configure, or no satisfactory DHCP responses were received.  Bad arguments.  A timer was set and the interface had not configured before it
       expired.  Can only be run as root.  Some system error (should never occur).

SEE ALSO

       Commands: dhcpconf(8), joinc(8), showdhc(8), shleases(8)

       Files: client.pcy(4), dhcptags(4)

       RFC1533

																       dhcpparm(8)

UNIX for Dummies Questions & Answers