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.