DHCP restart with bulk lease data

[Surya Teja]

If you mean, does the server stop serving clients while it's doing this,
AFAIK it continues as normal. --->
Yes Simon, I mean this scenario Thanks for that clarification
 Looking at the above, are you running failover ? If so, then I suspect one
of the records is from the partner server making an offer to a client at
the same time as this server does.---->
Yes I am running failover. but when the entry is shared from the failover
generally the binding state will be like *backup* right? but here in my
case i see both the entries as
*binding state active;*  thus I got a doubt about this duplicate.

On Fri, Sep 27, 2019 at 10:51 PM Simon Hobson <dhcp1 at thehobsons.co.uk>
wrote:

> Surya Teja <suryateja042 at gmail.com> wrote:
> >
> > Hi Simon Thanks for reply,
> >  Periodically, default is every hour, the server will write out a fresh
> leases file from it's internal structures  --->
> > I have a doubt when the server write out a fresh leases file from it's
> internal structures will the dhcpd service be in off state at this duration?
>
> The question is a little ambiguous.
> If you mean, will this happen while the server is stopped, no it won't.
> If you mean, does the server stop serving clients while it's doing this,
> AFAIK it continues as normal.
>
> >> this file will contain no duplicate entries --->
> > Hi I have seen the duplicate entry in my server lease file
> >  sample  snippet:
> > ==============
> > lease 192.168.2.52 {
> >   starts 5 2019/09/27 07:21:32;
> >   ends 5 2019/09/27 08:21:32;
> >   tstp 5 2019/09/27 08:51:32;
> >   tsfp 5 2019/09/27 08:21:32;
> >   cltt 5 2019/09/27 07:21:32;
> >   binding state active;
> >   next binding state expired;
> >   hardware ethernet 70:bb:e9:37:d9:9e;
> >   uid "\001p\273\3517\331\236";
> >   set vendor-class-identifier = "android-dhcp-9";
> >   client-hostname "RedmiNote6Pro";
> > }
> > lease 192.168.2.52 {
> >   starts 5 2019/09/27 07:21:32;
> >   ends 5 2019/09/27 08:21:32;
> >   tstp 5 2019/09/27 08:51:32;
> >   tsfp 5 2019/09/27 08:51:32;
> >   atsfp 5 2019/09/27 08:51:32;
> >   cltt 5 2019/09/27 07:21:32;
> >   binding state active;
> >   next binding state expired;
> >   hardware ethernet 70:bb:e9:37:d9:9e;
> >   uid "\001p\273\3517\331\236";
> >   set vendor-class-identifier = "android-dhcp-9";
> >   client-hostname "RedmiNote6Pro";
> > }
> > Yes It has same data, I don't see any issue on client side  but want to
> make sure that, Is this acceptable in lease file ?
>
> The lease file will be clean **immediately** after it's been re-written.
> Once clients are served, then new records will be appended and there is
> likely to be more than one record for some clients.
> Looking at the above, are you running failover ? If so, then I suspect one
> of the records is from the partner server making an offer to a client at
> the same time as this server does.
>
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