NAME

       dhcp6c — DHCPv6 client daemon

SYNOPSIS

       dhcp6c [-c configfile] [-Ddfi] [-p pid-file] [-P profile] interface [interfaces...]

DESCRIPTION

       dhcp6c  works  as  a  DHCPv6  client  and gets information from DHCPv6 servers to configure the specified
       interface.  Multiple interfaces can be specified separated by spaces or tabs, in which case  dhcp6c  will
       work on all the interfaces simultaneously.

       The command line options are:

       -c configfile
               Use configfile as the configuration file.

       -d      Print debugging messages.

       -D      Even more debugging information is printed.

       -f      Foreground  mode  (useful when debugging).  Although dhcp6c usually prints warning, debugging, or
               error messages to syslog(8), it  prints  the  messages  to  standard  error  if  this  option  is
               specified.

       -i      Info-req mode.  In this mode, stateless DHCPv6 is executed with the folllowing configuration, and
               the  obtained  info is written to stdout.  After this output, dhcp6c is terminated.  (suits for a
               use in shell-script etc).

                interface (interface given in the argument) {
                       information-only;
                       script (a script which displays the received information to stdout);
                };

               Since the configuration is internally generated, you cannot provide a configuration in this mode.
               If you want to have different actions for the stateless DHCPv6 information, you should  write  an
               appropriate configuration and invoke dhcp6c without this option.

       -p pid-file
               Use pid-file to dump the process ID of dhcp6c.

       -P profile
               Use the given profile defined in the dhcp6c configuration file for interfaces which do not have a
               specific configuration.

       The program will daemonize itself on invocation unless the -f or -i option is specified.

       Upon receipt of the SIGHUP or SIGTERM signals, dhcp6c will remove all stateful resources from the system.
       In  the  former case the daemon will then reinvoke itself, while it will stop running in the latter case.
       In either case, dhcp6c will send DHCPv6 Release messages to release resources assigned from servers.

FILES

       /var/run/dhcp6c.pid           is the default file that contains pid of the currently running dhcp6c.
       /etc/wide-dhcpv6/dhcp6c.conf  is the default configuration file.
       /var/lib/dhcpv6/dhcp6c_duid   is the file to store the client's DUID.

Configuration Script

       When dhcp6c receives a reply message, it will invoke a supplementary configuration  script  specified  in
       the dhcp6c.conf(5) file.  The daemon will provide the script with configuration parameters as environment
       variables, which include:

       REASON  The  reason  why  the  script is invoked.  As of this writing, the value is always "NBI" and thus
               meaningless.
       new_domain_name_servers
               A list of available DNS servers, each of which is an IPv6 numeric address and is separated  by  a
               white space character.
       new_domain_name
               A list of DNS names, which provides DNS name search path.
       new_ntp_servers
               A  list  of available NTP servers, each of which is an IPv6 numeric address and is separated by a
               white space character.
       new_sip_servers
               A list of available SIP server addresses, each of  which  is  an  IPv6  numeric  address  and  is
               separated by a white space character.
       new_sip_name
               A list of SIP server domain names.
       new_nis_servers
               A  list  of  available  NIS  server  addresses,  each  of which is an IPv6 numeric address and is
               separated by a white space character.
       new_nis_name
               A list of NIS domain names.
       new_nisp_servers
               A list of available NIS+ server addresses, each of which  is  an  IPv6  numeric  address  and  is
               separated by a white space character.
       new_nisp_name
               A list of NIS+ domain names.
       new_bcmcs_servers
               A  list  of  available  BCMCS  server  addresses, each of which is an IPv6 numeric address and is
               separated by a white space character.
       new_bcmcs_name
               A list of BCMCS server domain names.

       Note that the daemon does not always provide all the parameters.  It sets an  environment  variable  only
       when the corresponding configuration parameter is provided by the DHCPv6 server.

SEE ALSO

       daemon(3), dhcp6c.conf(5), dhcp6s(8)

       Ralph Droms, Editor, Dynamic Host Configuration Protocol for IPv6 (DHCPv6), RFC 3315, 2003.

HISTORY

       The dhcp6c command first appeared in WIDE/KAME IPv6 protocol stack kit.

BUGS

       dhcp6c  is  incomplete  and  violates DHCPv6 protocol spec, in several aspects.  In particular, temporary
       address assignment is intentionally omitted.

       Information Refresh Time Option is not recognized in Info-req mode,  since  dhcp6c  terminates  after  it
       receives a REPLY message.

KAME                                              Sep 12, 1999                                         DHCP6C(8)