<div dir="ltr">Hi,<div><br></div><div>Could you please confirm, Having two different versions on server and client side can lead to these kind of issues? or does this impact the system?</div><div><br></div><div>Thanks & Regards,</div><div>Muralikrishna CH</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Apr 16, 2019 at 12:47 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">
<br>
<br>
<div class="gmail-m_190933117867665795moz-cite-prefix">On 16/04/2019 06.10, Murali Krishna
wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div dir="ltr">Hi,
<div><br>
</div>
<div>Thanks for your inputs.</div>
<div><br>
</div>
<div>I quickly checked in my system.</div>
<div>
<div>From "/etc/dhcpd.conf", i could clearly see that 600 is
set to both max and default. This output is from server
side.</div>
<div> max-lease-time 600;</div>
<div> default-lease-time 600;</div>
</div>
</div>
</div>
</blockquote>
In this case the only other explanation I can think of is a rogue
server on your network. This would require a closer study of the
actual packet capture.<br>
<br>
<blockquote type="cite">
<div dir="ltr">
<div dir="ltr">
<div>
<div><span style="white-space:pre-wrap"> </span></div>
<div>On the client side, "/etc/dhclient.conf" says:</div>
<div><span style="white-space:pre-wrap"> </span>send
dhcp-lease-time 3600;</div>
</div>
<div><br>
</div>
<div>Thanks & Regards,</div>
<div>Muralikrishna CH</div>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Tue, Apr 16, 2019 at 12:25
AM Sten Carlsen <<a href="mailto:stenc@s-carlsen.dk" target="_blank">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"> <br>
<br>
<div class="gmail-m_190933117867665795gmail-m_7195361169354394153moz-cite-prefix">On
15/04/2019 18.48, Murali Krishna wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">Hi,
<div><br>
</div>
<div>
<div dir="ltr" class="gmail-m_190933117867665795gmail-m_7195361169354394153gmail_signature">
<div dir="ltr">
<div>Im facing issue with the dhcp lease
time. </div>
<div>Im having two different DHCP versions
in server and client side. I could see
that the lease file at the client had very
huge value of the dhcp lease.</div>
<div><br>
</div>
<div>version on the server side:</div>
<div>isc-dhcpd-4.3.6-P1<br>
</div>
<div><br>
</div>
<div>Version on the client side:</div>
<div>isc-dhcpd-4.2.1-P1<br>
</div>
<div><br>
</div>
<div>Content(part) of the lease file at the
client side:</div>
<div>dhcp-lease-time <span style="color:rgb(72,72,72);font-family:Verdana,sans-serif;font-size:9pt">152292816</span>;</div>
<div><br>
Output of pcap file used for debugging:</div>
<div>
<ul style="margin-bottom:0cm" type="disc">
<li class="MsoNormal" style="color:rgb(72,72,72);margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:9pt;font-family:Verdana,sans-serif" lang="EN-US"><a href="https://gordon.advantech.com.tw/issues/28" title="It shall be possible to
upgrade all embedded software to
the unit in a time less than 15
minutes. (Deferred)" style="color:rgb(5,99,193)" target="_blank">#28</a>:
Client sends "DHCP Request" to
server and asks the lease time
3600s. </span></li>
<li class="MsoNormal" style="color:rgb(72,72,72);margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:9pt;font-family:Verdana,sans-serif" lang="EN-US"><a href="https://gordon.advantech.com.tw/issues/29" title="An ATCA Blade FRUcontaining
embedded SW/FW components shall
support an HPI FUMI interface, per
co... (Closed)" style="color:rgb(5,99,193)" target="_blank">#29</a>:
The server replies the "DHCP ACK" to
client, but the lease time is
152292816s. <br>
</span></li>
</ul>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
The server is configured with two times, max-lease-time and
default-lease-time. It will send those times to the client,
in this case it looks like the server is configured to send
very long times (4.8 years). It is up to the client when it
wants to renew the lease, the 3600s is clearly within the
bounds of what it is given.<br>
<br>
If you want shorter lease times, the server needs to be
configured to hand out those times instead.<br>
<blockquote type="cite">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div>
<div dir="ltr" class="gmail-m_190933117867665795gmail-m_7195361169354394153gmail_signature">
<div dir="ltr">
<div>
<ul style="margin-bottom:0cm" type="disc">
</ul>
<div><br>
</div>
<div>Please help in getting this resolved.
Also please share in what kind of
situations the server will respond to
the client with a huge lease value.</div>
<div><br>
</div>
Thanks & Regards,<br>
Muralikrishna CH<br>
<br>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<br>
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-- <br>
<div dir="ltr" class="gmail-m_190933117867665795gmail_signature">
<div dir="ltr">
<div><br>
<br>
<br>
<br>
Thanks & Regards,<br>
Muralikrishna CH<br>
<br>
</div>
</div>
</div>
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</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>