setting preferred and valid lifetimes, T1 and T2, using dhclient.conf

[Glenn Satchell]

Hi Dusan

That web page might be quite an old version of dhclient.conf. I'd suggest
looking at the one installed on your client using 'man dhclient.conf' to
make sure it includes the latest settings that match your client.

The command you're probably looking for is 'send'. I'm not sure of the
exact option required, but it will be in the dhcp-options man page and
search for dhcp6.

In dhclient.conf add something like

send option dhcp6.<whatever> <value>

       send { [ option declaration ]
       [, ... option declaration ]}

       The send statement causes the client to send the specified options to
       the server with the specified values.  These are full option
       declarations as described in dhcp-options(5).  Options that are
       always sent in the DHCP protocol should not be specified here, except
       that the client can specify a requested dhcp-lease-time option other
       than the default requested lease time, which is two hours.  The other
       obvious use for this statement is to send information to the server
       that will allow it to differentiate between this client and other
       clients or kinds of clients.

regards,
-glenn

On Thu, June 18, 2015 6:15 am, Mudric, Dusan (Dusan) wrote:
> Hi DHCPv6 experts,
>
> I need help finding out how to set dhcpd6 client's IA_NA address preferred
> and valid lifetimes, and IA_NA T1 and T2, using dhclient.conf
> configuration file.
>
> rfc3315#section-22.4
> " If the time at which the addresses in an IA_NA are to be renewed is to
> be left to the discretion of the client, the server sets T1 and T2 to 0."
>
> The Internet Systems Consortium DHCP Client uses hard coded default
> values:
> - T1=3600,
> - T2=5400,
> - Preferred lifetime=7200, and
> - Valid lifetime=7500.
>
> Which http://linux.die.net/man/5/dhclient.conf options can be used to
> change these values when the server sets T1=T2=0?
>
> Thanks,
> Dusan Mudric.
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