Regarding the dhcp lease time
Bruce.Hudson at dal.ca
Mon May 13 16:54:40 UTC 2019
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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