1DHCP6C(8) BSD System Manager's Manual DHCP6C(8)
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4 dhcp6c — DHCPv6 client daemon
5
7 dhcp6c [-c configfile] [-Ddfi] [-p pid-file] [-P profile] interface
8 [interfaces...]
9
11 dhcp6c works as a DHCPv6 client and gets information from DHCPv6 servers
12 to configure the specified interface. Multiple interfaces can be speci‐
13 fied separated by spaces or tabs, in which case dhcp6c will work on all
14 the interfaces simultaneously.
15 The command line options are:
17 -c configfile
19 Use configfile as the configuration file.
20 -d Print debugging messages.
22 -D Even more debugging information is printed.
24 -f Foreground mode (useful when debugging). Although dhcp6c usually
26 prints warning, debugging, or error messages to syslog(8), it
27 prints the messages to standard error if this option is speci‐
28 fied.
29 -i Info-req mode. In this mode, stateless DHCPv6 is executed with
31 the following configuration, and the obtained info is written to
32 stdout. After this output, dhcp6c is terminated. (suits for a
33 use in shell-script etc).
34 interface (interface given in the argument) {
36 information-only;
37 script (a script which displays the received information to stdout);
38 };
39 Since the configuration is internally generated, you cannot pro‐
41 vide a configuration in this mode. If you want to have different
42 actions for the stateless DHCPv6 information, you should write an
43 appropriate configuration and invoke dhcp6c without this option.
44 -p pid-file
46 Use pid-file to dump the process ID of dhcp6c.
47 -P profile
49 Use the given profile defined in the dhcp6c configuration file
50 for interfaces which do not have a specific configuration.
51 The program will daemonize itself on invocation unless the -f or -i op‐
53 tion is specified.
54 Upon receipt of the SIGHUP or SIGTERM signals, dhcp6c will remove all
56 stateful resources from the system. In the former case the daemon will
57 then reinvoke itself, while it will stop running in the latter case. In
58 either case, dhcp6c will send DHCPv6 Release messages to release re‐
59 sources assigned from servers.
60
62 /var/run/dhcp6c.pid is the default file that contains pid of
63 the currently running dhcp6c.
64 /etc/wide-dhcpv6/dhcp6c.conf is the default configuration file.
65 /var/lib/dhcpv6/dhcp6c_duid is the file to store the client's DUID.
66
68 When dhcp6c receives a reply message, it will invoke a supplementary con‐
69 figuration script specified in the dhcp6c.conf(5) file. The daemon will
70 provide the script with configuration parameters as environment vari‐
71 ables, which include:
72 REASON The reason why the script is invoked. As of this writing, the
74 value is always "NBI" and thus meaningless.
75 new_domain_name_servers
76 A list of available DNS servers, each of which is an IPv6 numeric
77 address and is separated by a white space character.
78 new_domain_name
79 A list of DNS names, which provides DNS name search path.
80 new_ntp_servers
81 A list of available NTP servers, each of which is an IPv6 numeric
82 address and is separated by a white space character.
83 new_sip_servers
84 A list of available SIP server addresses, each of which is an
85 IPv6 numeric address and is separated by a white space character.
86 new_sip_name
87 A list of SIP server domain names.
88 new_nis_servers
89 A list of available NIS server addresses, each of which is an
90 IPv6 numeric address and is separated by a white space character.
91 new_nis_name
92 A list of NIS domain names.
93 new_nisp_servers
94 A list of available NIS+ server addresses, each of which is an
95 IPv6 numeric address and is separated by a white space character.
96 new_nisp_name
97 A list of NIS+ domain names.
98 new_bcmcs_servers
99 A list of available BCMCS server addresses, each of which is an
100 IPv6 numeric address and is separated by a white space character.
101 new_bcmcs_name
102 A list of BCMCS server domain names.
103 Note that the daemon does not always provide all the parameters. It sets
105 an environment variable only when the corresponding configuration parame‐
106 ter is provided by the DHCPv6 server.
107
109 daemon(3), dhcp6c.conf(5), dhcp6s(8)
110 Ralph Droms, Editor, Dynamic Host Configuration Protocol for IPv6
112 (DHCPv6), RFC 3315, 2003.
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115 The dhcp6c command first appeared in WIDE/KAME IPv6 protocol stack kit.
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118 dhcp6c is incomplete and violates DHCPv6 protocol spec, in several as‐
119 pects. In particular, temporary address assignment is intentionally
120 omitted.
121 Information Refresh Time Option is not recognized in Info-req mode, since
123 dhcp6c terminates after it receives a REPLY message.
124KAME Sep 12, 1999 KAME