dhcp6c.conf(5) Linux System Manager's Manual dhcp6c.conf(5)NAMEdhcp6c.conf - configuration file of the DHCPv6 client daemon, dhcp6c
DESCRIPTIONdhcp6c.conf is a configuration file for dhcp6c (DHCPv6 client).
dhcp6c is configured by the configuration information (such as rapid-
commit, requesting temp-address, or prefix-delegation) in this file.
dhcp6c.conf is an ASCII text file and lines that start with # are com‐
ments.
STATEMENTS
interface <interface name>
{
[declarations]
};
Write configurations for this interface in this statement. In [decla‐
rations], options can be specified.
DECLARATIONS
send [dhcpoptions];
With this declaration, dhcp6c sends specified options. Currently
rapid-commit is defined.
send rapid-commit;
This declaration enables dhcp6c to request the dhcp6s server to perform
a Rapid Commit.
request [dhcpoptions];
This declaration enables dhcp6c to request specified options. Cur‐
rently temp-address, domain-name-servers, and prefix-delegation are
defined.
request domain-name-servers;
The DHCPv6 mechanism provides a way to obtain configuration information
such as a list of available DNS servers or NTP servers. This declara‐
tion enables dhcp6c to request a DNS server address from the DHCPv6
server.
request prefix-delegation;
This declaration enables dhcp6c to request a Prefix Delegation to the
DHCPv6 server. dhcp6c gets a prefix assignment from the DHCPv6 server.
request temp-address;
This declaration enables dhcp6c to request temporary addresses. dhcp6c
requests Non-temporary Addresses as default. This option makes dhcp6c
request Temporary Addresses.
information-only;
This declaration enables dhcp6c to request host configuration informa‐
tion from the DHCPv6 server. If dhcp6c doesn't need to be assigned any
addresses, this option should be specified.
address {
[<ipv6 address>/<prefix length>];
[prefer-life-time <preferred-lifetime>];
[valid-life-time <valid-lifetime>];
};
This declaration defines the dhcp6c client preferred IPv6 address, the
preferred lifetime of the address, and the valid lifetime for this
interface.
prefix {
[<ipv6 prefix>/<prefix length>];
[prefer-life-time <preferred-lifetime>];
[valid-life-time <valid-lifetime>];
};
This declaration defines the dhcp6c client acting as a requesting
router for the preferred prefix, the prefix length, and the prefix's
preferred lifetime, and valid lifetime for this interface.
prefer-life-time <preferred-lifetime>;
This declaration sets the preferred lifetime (in seconds) of the
address or prefix. This declaration is valid only in address or prefix
declarations.
valid-life-time <valid-lifetime>;
This declaration sets the valid lifetime (in seconds) of the address or
prefix. This declaration is valid only in address or prefix declara‐
tions.
renew-time <renew-time>;
This declaration specifies the Renew Time (in seconds) for this Iden‐
tity Association (IA). Renew Time is a T1 value in an IA option. dhcp6c
sets the Renew Time in IA options to the specified value.
rebind-time <rebind-time>;
This declaration specifies the Rebind Time (in seconds) for this IA.
Rebind Time is T2 value in an IA option. dhcp6c sets the Rebind Time in
IA options to the specified value.
DHCPOPTIONS
rapid-commit
If this option is used in a "send [dhcpoptions];" declaration, dhcp6c
sends DHCPv6 messages with a Rapid Commit option.
domain-name-servers
If this option is used in a "request [dhcpoptions];" declaration,
dhcp6c requests the DNS server address via the DHCPv6 mechanism.
prefix-delegation
If this option is used in a "request [dhcpoptions];" declaration,
dhcp6c requests a Prefix Delegation to the DHCPv6 servers.
prefix-delegation-interface <interface name>
Specifies the name of the interface definition in radvd.conf
that dhcp6c will write the 'prefix' declaration for. By default,
dhcp6c will write a radvd.conf prefix declaration for the interface
on which it receives the prefix delegation lease.
use-ra-prefix;
This declaration tells the client not to request the address prefix
configured in the server's address or range statements. With this
option, client address prefixes can be set only by router advertise‐
ments, and the prefix configured in server address or range statements
will be ignored. This is a Red Hat extension; previously, the only way
to set client address prefixes was by router advertisement.
EXAMPLES
This is a sample of the dhcp6c.conf file.
interface eth0 {
send rapid-commit;
request prefix-delegation;
request domain-name-servers;
request temp-address;
iaid 11111;
address {
3ffe:10::10/64;
prefer-life-time 6000;
valid-life-time 8000;
};
renew-time 11000;
rebind-time 21000;
};
SEE ALSO
Dynamic Host Configuration Protocol for IPv6 (DHCPv6), IPv6 Prefix
Options for DHCPv6, dhcp6c(5)AUTHORS
Kazuo Hiekata <hiekata@yamato.ibm.com>
dhcp6c.conf 17 March 2003 dhcp6c.conf(5)
