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Full Discussion: DHCP Issue Possibly due to Hardware Clock?
Top Forums UNIX for Beginners Questions & Answers DHCP Issue Possibly due to Hardware Clock? Post 303005083 by mrm5102 on Thursday 12th of October 2017 01:40:54 PM
Old 10-12-2017
DHCP Issue Possibly due to Hardware Clock?
Hello All,

OS: openSUSE 13.1 (Bottle) (armv7hl)
PC: CuBox-i (*mini-pc)

The PC in question is a CuBox-i mini-pc. Since this PC doesn't have a battery, everytime the PC reboots the hardware clock is reset back to the same date every time, which is "2014-07-08 00:00".

I have NTP configured to get the current date and time from our NTP server, which does work eventually once the network comes up. Once the network is up, the NTP daemon runs and fixes the date and time.

However, I believe once NTP runs and changes the date and time, the DHCP lease timeout is reached (*14400 I believe). And because the time jumps ahead so far, it thinks the DHCP lease has timed-out and it gets a new IP Address. So within about a couple minutes of powering on, or rebooting the PC, it renews its DHCP Address and gets a new/2nd address.

I was wondering if maybe there is a way I can write the current system date and time so when it reboots, it doesn't think its 2014... Is anything like that possible?

Thanks in Advance,
Matt
 

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LEARN ABOUT MOJAVE

systemd-timesyncd.service

SYSTEMD-TIMESYNCD.SERVICE(8)                                 systemd-timesyncd.service                                SYSTEMD-TIMESYNCD.SERVICE(8)

NAME

       systemd-timesyncd.service, systemd-timesyncd - Network Time Synchronization

SYNOPSIS

       systemd-timesyncd.service

       /lib/systemd/systemd-timesyncd

DESCRIPTION

       systemd-timesyncd is a system service that may be used to synchronize the local system clock with a remote Network Time Protocol server. It
       also saves the local time to disk every time the clock has been synchronized and uses this to possibly advance the system realtime clock on
       subsequent reboots to ensure it monotonically advances even if the system lacks a battery-buffered RTC chip.

       The systemd-timesyncd service specifically implements only SNTP. This minimalistic service will set the system clock for large offsets or
       slowly adjust it for smaller deltas. More complex use cases are not covered by systemd-timesyncd.

       The NTP servers contacted are determined from the global settings in timesyncd.conf(5), the per-link static settings in .network files, and
       the per-link dynamic settings received over DHCP. See systemd.network(5) for more details.

       timedatectl(1)'s set-ntp command may be used to enable and start, or disable and stop this service.

FILES

       /var/lib/systemd/timesync/clock
           This file contains the timestamp of the last successful synchronization.

SEE ALSO

       systemd(1), timesyncd.conf(5), systemd.network(5), systemd-networkd.service(8), timedatectl(1), localtime(5), hwclock(8)

systemd 237                                                                                                           SYSTEMD-TIMESYNCD.SERVICE(8)
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