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    Yes, Eugène,<br>
    <br>
    depending on your system environment, you can find in the system log
    files (e.g. /var/log/messages), if your dhcpd server sends some
    offers.<br>
    I was a little bit confused about these two lines from your tcpdump
    output:<br>
    <b>DHCP:DISCOVER</b>
    <div><b>RQ:10.242.40.18<br>
        <br>
      </b>After a DISCOVER, you should see an OFFER, after a request,
      there should be an ACK or NAK. Some months ago, I saw an
      implementation with an older software release, there clients did
      not get any ACK'S anymore...<br>
      <br>
      I'm sure, that you can find the reason within the logs, or NAK's.<br>
      <br>
      Best regards,<br>
      Daniel<br>
    </div>
    <br>
    <br>
    <div class="moz-cite-prefix">Am 18.07.2014 12:29, schrieb Eugène
      Ngontang:<br>
    </div>
    <blockquote
cite="mid:CAMbdO_u__h_v5BbxMWWBowDpZ08k-womUSqnnUs1cYwtN9hK2w@mail.gmail.com"
      type="cite">
      <div dir="ltr">@Daniel, do think it's possible to see missing
        offers log messages? And how can I get them? Thanks.
        <div><br>
        </div>
        <div>Eugène NG</div>
      </div>
      <div class="gmail_extra"><br>
        <br>
        <div class="gmail_quote">2014-07-18 12:25 GMT+02:00 Eugène
          Ngontang <span dir="ltr"><<a moz-do-not-send="true"
              href="mailto:sympavali@gmail.com" target="_blank">sympavali@gmail.com</a>></span>:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0
            .8ex;border-left:1px #ccc solid;padding-left:1ex">
            <div dir="ltr">Yes, the dhcp server is in the same sunet as
              clients. If it was in the same subnet the clients could
              normaly nerver communicate and get IP addresses from the
              server.
              <div>
                <br>
              </div>
              <div>In the server log file I just see discovers and
                request from client. I can't see anything about the
                missing offers.</div>
              <div><br>
              </div>
              <div>Note that again that the first discovers when the
                server just starts get an offer, and at a certain time,
                the discovers don't get disciver anymore. And when I
                restart the dhcpd service, it start sending offers
                again.</div>
              <div><br>
              </div>
              <div>The above means sometime the server curls, but I
                don't and can't know while.</div>
              <div><br>
              </div>
              <div>Thank you.</div>
              <div><br>
              </div>
              <div>Regards,</div>
              <div>Eugène NG</div>
            </div>
            <div class="gmail_extra">
              <br>
              <br>
              <div class="gmail_quote">2014-07-18 12:08 GMT+02:00 Daniel
                Hoffmann <span dir="ltr"><<a moz-do-not-send="true"
                    href="mailto:daniel.hoffmann@kabelsat-bergen.de"
                    target="_blank">daniel.hoffmann@kabelsat-bergen.de</a>></span>:
                <div>
                  <div class="h5">
                    <br>
                    <blockquote class="gmail_quote" style="margin:0 0 0
                      .8ex;border-left:1px #ccc solid;padding-left:1ex">
                      <div text="#000000" bgcolor="#FFFFFF"> Greetings
                        Eugène,<br>
                        <br>
                        is the dhcp server within the same ip subnet
                        like the clients ? What does the dhcp server log
                        file tell you about the missing offers ? <br>
                        <br>
                        Best regards,<br>
                        Daniel<br>
                        <br>
                        <div>Am 18.07.2014 11:30, schrieb Eugène
                          Ngontang:<br>
                        </div>
                        <blockquote type="cite">
                          <div>
                            <div>
                              <div dir="ltr">Hi have got an issue with
                                my DHCP server that I can not locate the
                                origin.
                                <div><br>
                                </div>
                                <div>In fact I have a group of linux
                                  hosts with a dhcp server on which I
                                  made a reservation, configured to
                                  assign IP addresses to hosts staticaly
                                  (fixed address), with lease time of 6
                                  hours.</div>
                                <div><br>
                                </div>
                                <div>The problem is that at least one
                                  time per day, all hosts stop getting
                                  addresses from the server, while the
                                  dhcpd daemon is still running.</div>
                                <div><br>
                                </div>
                                <div>I have check, and noticed that the
                                  hosts do not longer receive DHCPOFFERs
                                  from the server, when they send a
                                  DHCHPDISCOVER.</div>
                                <div><br>
                                </div>
                                <div>With tcpdump on the server I can
                                  see request from clients, and the
                                  server just ignores them. I've try
                                  cleaning the dchpd leases file, but it
                                  doesn't fix the issue, but when I
                                  restart the service, all things turn
                                  fine.</div>
                                <div><br>
                                </div>
                                <div>What I would like to, is know what
                                  can the server be doing at this
                                  special time when a client want its IP
                                  address to be released? I've searched
                                  in several forums, and nobody seems to
                                  be able to answer me, since it seems
                                  to be a programming issue.</div>
                                <div><br>
                                </div>
                                <div>How can I get a technical
                                  documentation of dhcpd? Is it possible
                                  to understand when and why a server
                                  can ignore DHCPREQUEST?</div>
                                <div><br>
                                </div>
                                <div>Do someone here has already got
                                  this issue?</div>
                                <div> <br>
                                </div>
                                <div>What I've done temporarely, is to
                                  set a crontab to restart the dhc
                                  service each day at 6:03, 12:03, and
                                  18:03.</div>
                                <div><br>
                                </div>
                                <div>Here is an  extract of tcpdump on
                                  the server : </div>
                                <div><br>
                                </div>
                                <div>
                                  <div><b>tcpdump: listening on eth0,
                                      link-type EN10MB (Ethernet),
                                      capture size 1500 bytes</b></div>
                                  <div><b>2014-05-04 12:56:07.419712
                                      00:01:80:7d:db:14 > Broadcast,
                                      ethertype IPv4 (0x0800), length
                                      346: (tos 0x0, ttl 128, id 0,
                                      offse</b></div>
                                  <div><b>t 0, flags [none], proto: UDP
                                      (17), length: 328) 0.0.0.0.bootpc
                                      > 255.255.255.255.bootps: [udp
                                      sum ok] BOOTP/DHCP, Request fr</b></div>
                                  <div><b>om 00:01:80:7d:db:14, length:
                                      300, xid:0xc768345, secs:3, flags:
                                      [none] (0x0000)</b></div>
                                  <div><b>          Client Ethernet
                                      Address: 00:01:80:7d:db:14</b></div>
                                  <div><b>          Vendor-rfc1048:</b></div>
                                  <div><b>            DHCP:DISCOVER</b></div>
                                  <div><b>            RQ:10.242.40.18</b></div>
                                  <div><b>            HN:"FR-LYS-LX004"</b></div>
                                  <div><b>           
                                      PR:SM+BR+TZ+T121+DN+NS+HN+YD+YS+NTP+MTU+T119+DG</b></div>
                                  <div><b>        0x0000:  4500 0148
                                      0000 0000 8011 39a6 0000 0000</b></div>
                                  <div><b>        0x0010:  ffff ffff
                                      0044 0043 0134 f634 0101 0600</b></div>
                                  <div><b>        0x0020:  0c76 8345
                                      0003 0000 0000 0000 0000 0000</b></div>
                                  <div><b>        0x0030:  0000 0000
                                      0000 0000 0001 807d db14 0000</b></div>
                                  <div><b>        0x0040:  0000 0000
                                      0000 0000 0000 0000 0000 0000</b></div>
                                  <div><b>        0x0050:  0000 0000
                                      0000 0000 0000 0000 0000 0000</b></div>
                                  <div><b>        0x0060:  0000 0000
                                      0000 0000 0000 0000 0000 0000</b></div>
                                  <div><b>        0x0070:  0000 0000
                                      0000 0000 0000 0000 0000 0000</b></div>
                                  <div><b>        0x0080:  0000 0000
                                      0000 0000 0000 0000 0000 0000</b></div>
                                  <div><b>        0x0090:  0000 0000
                                      0000 0000 0000 0000 0000 0000</b></div>
                                  <div><b>        0x00a0:  0000 0000
                                      0000 0000 0000 0000 0000 0000</b></div>
                                  <div><b>        0x00b0:  0000 0000
                                      0000 0000 0000 0000 0000 0000</b></div>
                                  <div><b>        0x00c0:  0000 0000
                                      0000 0000 0000 0000 0000 0000</b></div>
                                  <div><b>        0x00d0:  0000 0000
                                      0000 0000 0000 0000 0000 0000</b></div>
                                  <div><b>        0x00e0:  0000 0000
                                      0000 0000 0000 0000 0000 0000</b></div>
                                  <div><b>        0x00f0:  0000 0000
                                      0000 0000 0000 0000 0000 0000</b></div>
                                  <div><b>        0x0100:  0000 0000
                                      0000 0000 6382 5363 3501 0132</b></div>
                                  <div><b>        0x0110:  040a f228
                                      120c 0c46 522d 4c59 532d 4c58</b></div>
                                  <div><b>        0x0120:  3030 3437
                                      0d01 1c02 790f 060c 2829 2a1a</b></div>
                                  <div><b>        0x0130:  7703 ff00
                                      0000 0000 0000 0000 0000 0000</b></div>
                                  <div><b>        0x0140:  0000 0000
                                      0000 0000 9c57 4f09</b></div>
                                </div>
                                <div><br>
                                </div>
                                <div>
                                  <div>I have pasted here above the dump
                                    just for one host, the rest is the
                                    same and only the MAC address
                                    differs.<br>
                                  </div>
                                  <div><br>
                                  </div>
                                  <div>Below is an extract of a client
                                    system log file :</div>
                                  <div><br>
                                  </div>
                                  <div><b> Apr 30 03:04:47
                                      00-01-80-7e-38-fd dhclient[653]:
                                      DHCPDISCOVER on eth0</b></div>
                                  <div><b>to 255.255.255.255 port 67
                                      interval 6 (xid=0x1e903fe)</b></div>
                                  <div><b>Apr 30 03:04:53
                                      00-01-80-7e-38-fd dhclient[653]:
                                      DHCPDISCOVER on eth0</b></div>
                                  <div><b>to 255.255.255.255 port 67
                                      interval 8 (xid=0x1e903fe)</b></div>
                                  <div><b>Apr 30 03:05:01
                                      00-01-80-7e-38-fd dhclient[653]:
                                      DHCPDISCOVER on eth0</b></div>
                                  <div><b>to 255.255.255.255 port 67
                                      interval 10 (xid=0x1e903fe)</b></div>
                                  <div><b>Apr 30 03:05:11
                                      00-01-80-7e-38-fd dhclient[653]:
                                      DHCPDISCOVER on eth0</b></div>
                                  <div><b>to 255.255.255.255 port 67
                                      interval 16 (xid=0x1e903fe)</b></div>
                                  <div><b>Apr 30 03:05:27
                                      00-01-80-7e-38-fd dhclient[653]:
                                      DHCPDISCOVER on eth0</b></div>
                                  <div><b>to 255.255.255.255 port 67
                                      interval 18 (xid=0x1e903fe)</b></div>
                                  <div><b>Apr 30 03:05:45
                                      00-01-80-7e-38-fd dhclient[653]:
                                      DHCPDISCOVER on eth0</b></div>
                                  <div><b>to 255.255.255.255 port 67
                                      interval 3 (xid=0x1e903fe)</b></div>
                                  <div><b>Apr 30 03:05:48
                                      00-01-80-7e-38-fd dhclient[653]:
                                      No DHCPOFFERS received.</b></div>
                                  <div><b>Apr 30 03:05:48
                                      00-01-80-7e-38-fd dhclient[653]:
                                      No working leases in</b></div>
                                  <div><b>persistent database -
                                      sleeping.</b></div>
                                  <div><br>
                                  </div>
                                  <div><br>
                                  </div>
                                  <div>Please can you help to idendify
                                    where the problem comes from?</div>
                                  <div><br>
                                  </div>
                                  <div>I thank you so much for your
                                    attention.</div>
                                  <div> <br>
                                  </div>
                                  <div>Best regards,</div>
                                  <div>Eugène NG</div>
                                  -- <br>
                                  <font color="#3366ff"><a
                                      moz-do-not-send="true"
                                      href="mailto:ngonta_e@epitech.net"
                                      target="_blank">ngonta_e@epitech.net</a></font>
                                  <div><font color="#3366ff"><a
                                        moz-do-not-send="true"
                                        href="mailto:sympavali@gmail.com"
                                        target="_blank">sympavali@gmail.com</a></font></div>
                                  <div>------------------------------------------------------------</div>
                                  <div><i><b>Aux hommes il faut un chef,
                                        et au</b></i><i><b> chef il faut
                                        des hommes!<br>
                                        L'habit ne fait pas le moine,
                                        mais lorsqu'on te voit on te
                                        juge!<br>
                                      </b></i></div>
                                </div>
                              </div>
                              <br>
                              <fieldset></fieldset>
                              <br>
                            </div>
                          </div>
                          <div>
                            <pre>_______________________________________________
dhcp-users mailing list
<a moz-do-not-send="true" href="mailto:dhcp-users@lists.isc.org" target="_blank">dhcp-users@lists.isc.org</a>
<a moz-do-not-send="true" href="https://lists.isc.org/mailman/listinfo/dhcp-users" target="_blank">https://lists.isc.org/mailman/listinfo/dhcp-users</a></pre>
                          </div>
                        </blockquote>
                        <br>
                        <pre cols="72">-- 
Kabel + Satellit Bergen
Kommunikationstechnik GmbH

Tilzower Weg 32
18528 Bergen auf Rügen

Telefon: 038 38 - 25 04 80
Fax: 038 38 - 20 91 36

Geschäftsführer: Hans-Peter Malze , Rolf Hoffmann
HRB 7582 Stralsund
Finanzamt Stralsund
St.-Nr. 082 / 112 / 01461
USt. ID: DE 134877127 </pre>
                      </div>
                      <br>
                      _______________________________________________<br>
                      dhcp-users mailing list<br>
                      <a moz-do-not-send="true"
                        href="mailto:dhcp-users@lists.isc.org"
                        target="_blank">dhcp-users@lists.isc.org</a><br>
                      <a moz-do-not-send="true"
                        href="https://lists.isc.org/mailman/listinfo/dhcp-users"
                        target="_blank">https://lists.isc.org/mailman/listinfo/dhcp-users</a><br>
                    </blockquote>
                  </div>
                </div>
              </div>
              <div>
                <div class="h5"><br>
                  <br clear="all">
                  <div><br>
                  </div>
                  -- <br>
                  <font color="#3366ff"><a moz-do-not-send="true"
                      href="mailto:ngonta_e@epitech.net" target="_blank">ngonta_e@epitech.net</a></font>
                  <div>
                    <font color="#3366ff"><a moz-do-not-send="true"
                        href="mailto:sympavali@gmail.com"
                        target="_blank">sympavali@gmail.com</a></font></div>
                  <div>------------------------------------------------------------</div>
                  <div><i><b>Aux hommes il faut un chef, et au</b></i><i><b> chef
                        il faut des hommes!<br>
                        L'habit ne fait pas le moine, mais lorsqu'on te
                        voit on te juge!<br>
                      </b></i></div>
                </div>
              </div>
            </div>
          </blockquote>
        </div>
        <br>
        <br clear="all">
        <div><br>
        </div>
        -- <br>
        <font color="#3366ff"><a moz-do-not-send="true"
            href="mailto:ngonta_e@epitech.net" target="_blank">ngonta_e@epitech.net</a></font>
        <div><font color="#3366ff"><a moz-do-not-send="true"
              href="mailto:sympavali@gmail.com" target="_blank">sympavali@gmail.com</a></font></div>
        <div>------------------------------------------------------------</div>
        <div><i><b>Aux hommes il faut un chef, et au</b></i><i><b> chef
              il faut des hommes!<br>
              L'habit ne fait pas le moine, mais lorsqu'on te voit on te
              juge!<br>
            </b></i></div>
      </div>
      <br>
      <fieldset class="mimeAttachmentHeader"></fieldset>
      <br>
      <pre wrap="">_______________________________________________
dhcp-users mailing list
<a class="moz-txt-link-abbreviated" href="mailto:dhcp-users@lists.isc.org">dhcp-users@lists.isc.org</a>
<a class="moz-txt-link-freetext" href="https://lists.isc.org/mailman/listinfo/dhcp-users">https://lists.isc.org/mailman/listinfo/dhcp-users</a></pre>
    </blockquote>
    <br>
    <pre class="moz-signature" cols="72">-- 
Kabel + Satellit Bergen
Kommunikationstechnik GmbH

Tilzower Weg 32
18528 Bergen auf Rügen

Telefon: 038 38 - 25 04 80
Fax: 038 38 - 20 91 36

Geschäftsführer: Hans-Peter Malze , Rolf Hoffmann
HRB 7582 Stralsund
Finanzamt Stralsund
St.-Nr. 082 / 112 / 01461
USt. ID: DE 134877127 </pre>
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