Strange Option82 Anomoly in lease allocation

[project722]

Thanks Bob, looks like I need to get more familar with our failover pair :-0

On Wed, Oct 19, 2016 at 10:44 AM, Bob Harold <rharolde at umich.edu> wrote:

>
>
> On Wed, Oct 19, 2016 at 10:56 AM, project722 <project722 at gmail.com> wrote:
>
>> After enabling Option 82 on our Adtran and Calix shelves, along with
>> enabling the relay agent and log profile on the server to capture the O82
>> data, all of our test Genexis RG's, after a reboot, came back online with a
>> 30 minute lease. Here is a sample conf line from one of them:
>>
>> Before reboot:
>>
>> Option  51 : lease-time 2592000
>>
>> After Reboot:
>>
>> Option  51 : lease-time 1800
>>
>> And, in the lease file on the DHCP server, I see 2 leases written in the
>> "active" binding state, one for the new 30 minute lease, and another for
>> the existing lease. The new 30 minute lease record includes the option 82
>> data:
>>
>> lease 192.168.10.5 { (30 minute)
>>   starts 3 2016/10/19 06:46:22;
>>   ends 3 2016/10/19 07:16:22;
>>   tstp 5 2016/11/18 07:01:22;
>>   tsfp 3 2016/10/19 06:43:59;
>>   cltt 3 2016/10/19 06:46:22;
>>   binding state active;
>>   next binding state expired;
>>   hardware ethernet 00:0r:24:c1:18:d0;
>>   uid "\001\000\017\224\301\030\320";
>>   option agent.circuit-id "Option82 data here";
>>
>> And here is the existing lease:(30 day)
>>
>> lease 192.168.10.5 {
>>   starts 5 2016/10/07 05:51:44;
>>   ends 0 2016/11/06 05:51:44;
>>   tstp 3 2016/08/24 05:35:15;
>>   tsfp 1 2016/11/21 05:51:44;
>>   atsfp 1 2016/11/21 05:51:44;
>>   binding state active;
>>   next binding state expired;
>>   hardware ethernet 00:0r:24:c1:18:d0;
>>   uid "\001\000\017\224D\022\200";
>> }
>>
>> Whats even more interesting, is that once the 30 minute lease expires it
>> moves into a brand new 30 day lease, which is our default. My understanding
>> is that the RG should move directly into its new 30 day lease upon coming
>> back online. (I verified that these did signal a DHCPRELEASE on the
>> reboot).
>>
>> We do not have 30 minute lease times declared on the server for any
>> market, and I find it strange that I see a lease record in the leases file
>> for 2 active leases, one being the 30 minute one, and with the option 82
>> data present. This seems to be happening from behind both our Adtran and
>> Calix shelves.
>>
>> Does anyone have any thoughts on this?
>>
>>
> This is all normal.
> You are apparently running with failover, so a first lease (or a lease
> after a release) will be the "MCLT" which defaults to 30 minutes.
> The lease file is appended with new information and only occasionally
> rewritten.  Only the last entry for any host counts.
>
> --
> Bob Harold
>
>
>
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