<div dir="ltr"><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><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">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">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">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>
_______________________________________________<br>
dhcp-users mailing list<br>
<a href="mailto:dhcp-users@lists.isc.org" target="_blank">dhcp-users@lists.isc.org</a><br>
<a href="https://lists.isc.org/mailman/listinfo/dhcp-users" rel="noreferrer" target="_blank">https://lists.isc.org/mailman/listinfo/dhcp-users</a><br>
</blockquote>
</div>
<br clear="all">
<div><br>
</div>
-- <br>
<div dir="ltr" class="gmail-m_-8392774289414875111gmail_signature">
<div dir="ltr">
<div><br>
<br>
<br>
<br>
Thanks & Regards,<br>
Muralikrishna CH<br>
<br>
</div>
</div>
</div>
<br>
<fieldset class="gmail-m_-8392774289414875111mimeAttachmentHeader"></fieldset>
<pre class="gmail-m_-8392774289414875111moz-quote-pre">_______________________________________________
dhcp-users mailing list
<a class="gmail-m_-8392774289414875111moz-txt-link-abbreviated" href="mailto:dhcp-users@lists.isc.org" target="_blank">dhcp-users@lists.isc.org</a>
<a class="gmail-m_-8392774289414875111moz-txt-link-freetext" href="https://lists.isc.org/mailman/listinfo/dhcp-users" target="_blank">https://lists.isc.org/mailman/listinfo/dhcp-users</a>
</pre>
</blockquote>
<br>
</div>
_______________________________________________<br>
dhcp-users mailing list<br>
<a href="mailto:dhcp-users@lists.isc.org" target="_blank">dhcp-users@lists.isc.org</a><br>
<a href="https://lists.isc.org/mailman/listinfo/dhcp-users" rel="noreferrer" target="_blank">https://lists.isc.org/mailman/listinfo/dhcp-users</a><br>
</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><br><br><br><br>Thanks & Regards,<br>Muralikrishna CH<br><br></div></div></div></div></div>