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To subscribe or unsubscribe via the World Wide Web, visit https://lists.isc.org/mailman/listinfo/dhcp-users or, via email, send a message with subject or body 'help' to dhcp-users-requ...@lists.isc.org You can reach the person managing the list at dhcp-users-ow...@lists.isc.org When replying, please edit your Subject line so it is more specific than "Re: Contents of dhcp-users digest..." Today's Topics: 1. Re: Regarding the dhcp lease time (Murali Krishna) ---------------------------------------------------------------------- Message: 1 Date: Tue, 7 May 2019 22:28:40 +0530 From: Murali Krishna <muralikris...@gmail.com> To: Users of ISC DHCP <dhcp-users@lists.isc.org> Subject: Re: Regarding the dhcp lease time Message-ID: <cakhvxa3gtcknesvu+hcsv3fwkk_b97+_s5ef8eflv3jdvrq...@mail.gmail.com> Content-Type: text/plain; charset="utf-8" Hi, Shift in the system clock is part of the usecase(got this information from local team). Also collected the pcap file by reproducing the issue. I have taken the screenshot of the pcap file where it clearly mentions about the huge lease value. Im not very sure whether it is ok to attach the complete pcap file to the discussion. Also could you please help me understand how the lease value is calculated? How the lease value is calculated at the server end and provided to the client? How the client lease file is updated? In the current scenario(in one of the execution) where the time stamp is updated to the older value as part of the use case Time stamp on the Server is: date: date: Fri May 2 00:00:17 IST 2014 Time stamp on the client side is: date: Tue May 7 15:12:08 IST 2019 >From the lease file(content) on the client side: option dhcp-lease-time 158253456; option dhcp-message-type 5; option dhcp-server-identifier 169.254.64.12; renew 5 2021/06/11 03:34:31; rebind 2 2023/09/26 02:07:54; expire 0 2024/05/12 01:02:36; This dhcp-lease-time is matching approximately to the difference in the timestamps of server and the client. Many thanks in advance. Thanks & Regards, Muralikrishna CH On Tue, May 7, 2019 at 1:57 AM Simon Hobson <dh...@thehobsons.co.uk> wrote: > Murali Krishna <muralikris...@gmail.com> wrote: > > > While analyzing the logs, it has been observed that the system time is > updated to very old time stamp(almost 5yrs back). > > On the server ? If this is the case, then the DHCP service is not your > problem. You need to find out what's going on with the system clock - until > you do that then it's pointless trying to solve other problems. > > On the client ? In this case, then I can only *guess* that the client > service is seeing the time difference between the system clock and the end > time/date it has stored, and updating something accordingly. > > It might help if you showed the actual log entries, not just the > timestamps. In any case, the cause of the clock changing should be the > focus of your investigations. > > _______________________________________________ > dhcp-users mailing list > dhcp-users@lists.isc.org > https://lists.isc.org/mailman/listinfo/dhcp-users > -- Thanks & Regards, Muralikrishna CH -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://lists.isc.org/pipermail/dhcp-users/attachments/20190507/e0d77717/attachment.html> -------------- next part -------------- A non-text attachment was scrubbed... Name: PcapScreenshot.docx Type: application/vnd.openxmlformats-officedocument.wordprocessingml.document Size: 365264 bytes Desc: not available URL: <https://lists.isc.org/pipermail/dhcp-users/attachments/20190507/e0d77717/attachment.bin> ------------------------------ Subject: Digest Footer _______________________________________________ dhcp-users mailing list dhcp-users@lists.isc.org https://lists.isc.org/mailman/listinfo/dhcp-users ------------------------------ End of dhcp-users Digest, Vol 127, Issue 5 ******************************************