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

[Mudric, Dusan (Dusan)]

Hi David,

As suggested, I tested with:

       # Example: IAID=4f4fb85a, T1=5555, T2=6666
        send dhcp6.ia-na 4F:4F:B8:5A: 00:00:15:B3:00:00:1A:0A;

There is a bug in ISC 4.0 DHCPv6 client. It sent two IA_NA options in SOLICIT:

   Identity Association for Non-temporary Address
   Option: Identity Association for Non-temporary Address (3)
   Length: 12
   Value: 4f4fb85a000015b300001a0a
   IAID: 4f4fb85a
   T1: 5555
   T2: 6666

   Identity Association for Non-temporary Address
   Option: Identity Association for Non-temporary Address (3)
   Length: 12
   Value: 4f4fb85a00000e1000001518
   IAID: 4f4fb85a
   T1: 3600
   T2: 5400

and even three IA_NA options in REQUEST. Do you know if this problem was fixed in DHCPv6 4.3.2?

Second question: Is there a way for the client to control Preferred and Valid lifetimes using dhclient.conf attributes? If yes, how?

Thanks,
Dusan.

>Message: 3
>Date: Thu, 18 Jun 2015 18:59:17 +0300
>From: David Ganor <david at oliver-solutions.com>
>To: dhcp-users at lists.isc.org
>Subject: Re: setting preferred and valid lifetimes, T1 and T2,	using
	dhclient.conf
>Message-ID: <5582EAD5.1080706 at oliver-solutions.com>
>Content-Type: text/plain; charset=windows-1252; format=flowed
>
>Hi,
>As an example, follows is how we set it in our DHCPv6 client config:
>
>send dhcp6.ia-na WW:WW:WW:WW:T1:T1:T1:T1:T2:T2:T2:T2;
>
>Where "WW:WW:WW:WW" is the 4 hexa bytes of the IAID (in network byte order), "T1:T1:T1:T1" is the 4 hexa bytes of T1 (in network >byte order) and "T2:T2:T2:T2" is the 4 hexa bytes of T2 (in network byte order)
>
>HTH,
>
>Best regards,
>David Ganor
>
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>
>On 18/06/2015 04:07, Glenn Satchell wrote:
>> 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 
>>> https://urldefense.proofpoint.com/v2/url?u=http->3A__linux.die.net_man_5_dhclient.conf&d=AwICAg&c=BFpWQw8bsuKpl1SgiZH64Q&r=UT3Bk9cbLeaJxhf3iCrhIoUWB8YLZU23029sMQG2>kY&m=crMLHloqV850U_QjmZ6NC9Fduw1bBEF_Qden1OZHIRM&s=pENlDW3X0NUWblfnlKN95r5Z-xK9arCM863dXz016aM&e=  options >can be used to change these values when the server sets T1=T2=0?
>>>
>>> Thanks,
>>> Dusan Mudric.
>>> _______________________________________________