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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>
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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
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-- <br>
<font color="#3366ff"><a moz-do-not-send="true"
href="mailto:ngonta_e@epitech.net" target="_blank">ngonta_e@epitech.net</a></font>
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<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>
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<font color="#3366ff"><a moz-do-not-send="true"
href="mailto:ngonta_e@epitech.net" target="_blank">ngonta_e@epitech.net</a></font>
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<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>
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<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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