Regarding the dhcp lease time

[Murali Krishna]

Hi,

>> What have you configured on the server for the 'default-lease-time'
parameter?
600s is configured in the conf file.

>>When you change the clock, are you deleting the existing lease database?
Nothing is modified w.r.t the lease database.

Thanks & Regards,
Muralikrishna

On Mon, May 13, 2019 at 10:24 PM Bruce Hudson <Bruce.Hudson at dal.ca> wrote:

> On Mon, May 13, 2019 at 08:46:46PM +0530, Murali Krishna wrote:
>
> > In the current scenario client requested for the respective lease for the
> > time duration as mentioned in the conf file.
> >
> > Here is the sequence of flow it happened:
> > 1. Client initiates DHCP Request for 3600s(1hr)
> > 2. Server acknowledges(DHCP Ack) with lease time:(158253440s) 1831 days,
> 15
> > hours, 17 minutes, 20 seconds
> >
> > How the server is calculating the lease time which is not the one defined
> > as per the conf file.
>
>     I suspect your timeline is incomplete. Let me propose an alternative
> (for
> which, I confess, I have no real evidence):
>
>     1. Client initiates DHCP Request for 3600s(1hr)
>     2. Server acknowledges this lease and records it in the lease file,
>        ending at an absolute time of "now+1 hour".
>
>     3. System admin sets the clock back 5 years.
>
>     4. Client initiates DHCP Request for 3600s(1hr)
>     5. Server acknowledges the existing, still valid lease, ending at an
>         absolute time the server sees as 5 years in the future.
>
>     When you change the clock, are you deleting the existing lease
> database?
> --
> Bruce A. Hudson                         | Bruce.Hudson at Dal.CA
> ITS, Networks and Systems               |
> Dalhousie University                    |
> Halifax, Nova Scotia, Canada            | (902) 494-3405
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>


-- 




Thanks & Regards,
Muralikrishna CH
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