Strange Option82 Anomoly in lease allocation

[Bob Harold]

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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