dhcp6c.conf






dhcp6c.conf − configuration file of the DHCPv6 client
daemon, dhcp6c


dhcp6c.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 comments.


     STATEMENTS

     interface <interface name>
{
     [declarations]
};
Write configurations for this interface in this statement.
In [declarations], 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.  Currently 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 declaration 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.









                             ‐2‐


information‐only;
This declaration enables dhcp6c to request host
configuration information 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 declarations.

renew‐time <renew‐time>;
This declaration specifies the Renew Time (in seconds) for
this Identity 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.










                             ‐3‐


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.

name>prefix−delegation−interface<interface
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.




     This is a sample of the dhcp6c.conf file.
{interfaceeth0
     sendrapid‐commit;
     requestprefix‐delegation;
     requestdomain‐name‐servers;
     requesttemp‐address;
     iaid11111;
     address{
          3ffe:10::10/64;
          prefer‐life‐time6000;
          valid‐life‐time8000;
     };
     renew‐time11000;
     rebind‐time21000;
};


Dynamic Host Configuration Protocol for IPv6 (DHCPv6), IPv6
Prefix Options for DHCPv6, dhcp6c(5)




Kazuo Hiekata <hiekata@yamato.ibm.com>