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<div class="moz-cite-prefix">On 06/05/2019 18.06, Murali Krishna
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAKhvxa27aTbYGST_Y9vyCRr-jymyQivciCbkxbc3V7xR_nANOA@mail.gmail.com">
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<div>Hi Carlsen,</div>
<div><br>
</div>
<div>Time on the client side was not observed. Will try to get
the time on server and the client when this is observed.</div>
<div>Is this the expected behaviour of the dhcp that the server
hands out a lease covering the time from the clients time to
the current server time?</div>
</div>
</blockquote>
I don't know. IIRC time from both ends is in the packets.<br>
<br>
I am sure someone else knows how the time is actually calculated, I
was mostly guessing.<br>
<br>
Sten<br>
<blockquote type="cite"
cite="mid:CAKhvxa27aTbYGST_Y9vyCRr-jymyQivciCbkxbc3V7xR_nANOA@mail.gmail.com">
<div dir="ltr">
<div><br>
</div>
Thanks & Regards,
<div>Muralikrishna CH<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon, May 6, 2019 at
9:07 PM Sten Carlsen <<a
href="mailto:stenc@s-carlsen.dk" moz-do-not-send="true">stenc@s-carlsen.dk</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFCC"> Interesting.<br>
<br>
Seems the server hands out a lease covering the time
from the client's time to the current server time,
essentially forever.<br>
<br>
This might have been done to compensate for the elapsed
time from the client sends the request until it is
handled.<br>
<br>
One might think a cap on that time gap would be
appropriate.<br>
<br>
I wonder if the client was ahead of the server time
wise, would the lease then be shorter -> negative
-> no lease time?<br>
<br>
<div class="gmail-m_-8392774289414875111moz-cite-prefix">On
06/05/2019 16.54, Murali Krishna wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">Hi,
<div><br>
</div>
<div>Before we tried to collect the packet captures.
I would like to share some information on the
issue.</div>
<div>While analyzing the logs, it has been observed
that the system time is updated to very old time
stamp(almost 5yrs back). From this point onwards
we are able to see that the huge lease value is
getting updated in the client lease file. <br>
</div>
<div>
<p class="MsoNormal" style="margin:0cm 0cm
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span
style="font-size:9pt;font-family:"Courier
New"">30566:Tue Apr 30 14:58:03 IST 2019</span></p>
<p class="MsoNormal" style="margin:0cm 0cm
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span
style="font-size:9pt;font-family:"Courier
New"">30804:Tue Apr 30 14:58:24 IST 2019</span></p>
<p class="MsoNormal" style="margin:0cm 0cm
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span
style="font-size:9pt;font-family:"Courier
New"">31042:Fri May 2 00:00:14 IST 2014</span></p>
<p class="MsoNormal" style="margin:0cm 0cm
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span
style="font-size:9pt;font-family:"Courier
New"">31280:Fri May 2 00:00:35 IST 2014</span></p>
<p class="MsoNormal" style="margin:0cm 0cm
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span
style="font-size:9pt;font-family:"Courier
New"">31531:Fri May 2 00:00:56 IST 2014</span></p>
<p class="MsoNormal" style="margin:0cm 0cm
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span
style="font-size:9pt;font-family:"Courier
New"">…</span></p>
<p class="MsoNormal" style="margin:0cm 0cm
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span
style="font-size:9pt;font-family:"Courier
New"">33379:Fri May 2 00:03:23 IST 2014</span></p>
<p class="MsoNormal" style="margin:0cm 0cm
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span
style="font-size:9pt;font-family:"Courier
New"">33643:Fri May 2 00:03:44 IST 2014</span></p>
<p class="MsoNormal" style="margin:0cm 0cm
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span
style="font-size:9pt;font-family:"Courier
New"">33907:Fri May 2 00:04:05 IST 2014</span></p>
<p class="MsoNormal" style="margin:0cm 0cm
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span
style="font-size:9pt;font-family:"Courier
New"">34171:Fri May 2 00:04:26 IST 2014</span></p>
<p class="MsoNormal" style="margin:0cm 0cm
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span
style="font-size:9pt;font-family:"Courier
New"">34435:Fri May 2 00:04:47 IST 2014</span></p>
<p class="MsoNormal" style="margin:0cm 0cm
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span
style="font-size:9pt;font-family:"Courier
New"">34699:Tue Apr 30 15:03:39 IST 2019</span></p>
<p class="MsoNormal" style="margin:0cm 0cm
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span
style="font-size:9pt;font-family:"Courier
New"">34963:Tue Apr 30 15:04:00 IST 2019</span></p>
<p class="MsoNormal" style="margin:0cm 0cm
0.0001pt;font-size:11pt"><span
style="font-size:9pt"><font face="arial,
helvetica, sans-serif"><br>
</font></span></p>
<p class="MsoNormal" style="margin:0cm 0cm
0.0001pt"><span style="font-size:12px"><font
face="arial, helvetica, sans-serif">Even
though the system time is updated to the
current time, there was no update to the
client lease file. client lease file is
updated to the correct value only after we
restarted the client.</font></span></p>
<p class="MsoNormal" style="margin:0cm 0cm
0.0001pt"><span style="font-size:12px"><font
face="arial, helvetica, sans-serif"><br>
</font></span></p>
<p class="MsoNormal" style="margin:0cm 0cm
0.0001pt"><span style="font-size:12px"><font
face="arial, helvetica, sans-serif">Thanks
& Regards,</font></span></p>
<p class="MsoNormal" style="margin:0cm 0cm
0.0001pt"><span style="font-size:12px"><font
face="arial, helvetica, sans-serif">Muralikrishna
CH</font></span></p>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Tue, Apr 16,
2019 at 10:32 PM Simon Hobson <<a
href="mailto:dhcp1@thehobsons.co.uk"
target="_blank" moz-do-not-send="true">dhcp1@thehobsons.co.uk</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px
0px 0px 0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">Sten Carlsen
<<a href="mailto:stenc@s-carlsen.dk"
target="_blank" moz-do-not-send="true">stenc@s-carlsen.dk</a>>
wrote:<br>
<br>
> The server is configured with two times,
max-lease-time and default-lease-time.<br>
<br>
Just to expend on that ...<br>
There is also min-lease-time.<br>
<br>
If the client specifies a desired lease time then
the server will give that subject to min and max
lease times.<br>
If the client does not ask for a specific lease
time, then the default lease time is offered.<br>
<br>
As already mentioned, the first thing to do is
look more closely at your packet captures. Check
which devices the packets come from, and what's in
them - particularly what options the client sends.<br>
<br>
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<br>
<br>
Thanks & Regards,<br>
Muralikrishna CH<br>
<br>
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<br>
<br>
<br>
Thanks & Regards,<br>
Muralikrishna CH<br>
<br>
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