<html><head></head><body bgcolor="#FFFFFF"><div><blockquote type="cite"><div><div><font class="Apple-style-span" color="#000000">Hi</font></div><div><font class="Apple-style-span" color="#000000">The best solution, is to dedicate one separate subnet for the fixed IPs , or remove a number of IPs you need to fix from the pool range. Another solution, is to enable ping on your CPEs , as the dhcp server (by default)try to ping the IP before serving it to a client.<br><br></font><div><font class="Apple-style-span" color="#000000">Best Regards</font></div><font class="Apple-style-span" color="#000000">Red1</font></div></div></blockquote><br><div>Best Regards</div>Red1</div><div><br></div><div></div><blockquote type="cite"><div><div><br></div><div><br>On Feb 14, 2012, at 19:48, Randall C Grimshaw <<a href="mailto:rgrimsha@syr.edu">rgrimsha@syr.edu</a>> wrote:<br><br></div><div></div><blockquote type="cite"><div>
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If you combine your syslog for the two peer servers you will probably see that the conflicting address was offered by the peer but not accepted by the client - which did accept the alternate offer. You may not need to be concerned about this message.
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<div>I use the 'deny duplicates;' configuration option. it is documented in 'man dhcpd.conf' YMMV.<br>
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<div><font face="Tahoma" size="2">Randall Grimshaw <a href="mailto:rgrimsha@syr.edu">
rgrimsha@syr.edu</a></font></div>
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<div style="direction: ltr;" id="divRpF282441"><font color="#000000" face="Tahoma" size="2"><b>From:</b> <a href="mailto:dhcp-users-bounces+rgrimsha=syr.edu@lists.isc.org">dhcp-users-bounces+rgrimsha=syr.edu@lists.isc.org</a> [<a href="mailto:dhcp-users-bounces+rgrimsha=syr.edu@lists.isc.org">dhcp-users-bounces+rgrimsha=syr.edu@lists.isc.org</a>] on behalf of Moayad mohammad [<a href="mailto:mailinglists@bluezonejordan.com">mailinglists@bluezonejordan.com</a>]<br>
<b>Sent:</b> Tuesday, February 14, 2012 10:11 AM<br>
<b>To:</b> 'Users of ISC DHCP'<br>
<b>Subject:</b> RE: Duplicated IP's<br>
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<p class="MsoNormal"><span style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">Hi,</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal" style="text-indent: 0.5in;"><span style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">I moved all the reserved addresses out of the range pool, but still I got the same problem and found the following
records in the log files</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"> “uid lease xxx for client 00:33:19:01:0a:91 is duplicate on wimax”</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">Regards,</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">Moayad</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><b><span style="font-size: 10pt; font-family: "Tahoma","sans-serif";">From:</span></b><span style="font-size: 10pt; font-family: "Tahoma","sans-serif";"> <a href="mailto:dhcp-users-bounces+mailinglists=bluezonejordan.com@lists.isc.org">dhcp-users-bounces+mailinglists=bluezonejordan.com@lists.isc.org</a> [mailto:dhcp-users-bounces+mailinglists=<a href="mailto:bluezonejordan.com@lists.isc.org">bluezonejordan.com@lists.isc.org</a>]
<b>On Behalf Of </b>José Queiroz<br>
<b>Sent:</b> Tuesday, February 14, 2012 5:08 PM<br>
<b>To:</b> Users of ISC DHCP<br>
<b>Subject:</b> Re: Duplicated IP's</span></p>
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<p class="MsoNormal" style="margin-bottom: 12pt;">Hi Mohammad,<br>
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Unfortunatelly I cannot help you in this problem with the urgency that you need. I suggest you to verify the condition that Chris Buxton said in his last message, and try to move the reserved addresses out of the address pool.</p>
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<p class="MsoNormal">Em 14 de fevereiro de 2012 12:45, Moayad mohammad <<a href="mailto:mailinglists@bluezonejordan.com" target="_blank">mailinglists@bluezonejordan.com</a>> escreveu:</p>
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<p class="MsoNormal" style=""><span style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">Dear Jose,</span></p>
<p class="MsoNormal" style=""><span style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"> Thank you for your email, but I need your help to review my dhcp configuration file.
</span></p>
<p class="MsoNormal" style=""><span style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
</span></p>
<p class="MsoNormal" style=""><span style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"> I am sorry to disturb you and send email directly to your personal email without sending to the mailing list, I have urgent
issue and I have to solve it.</span></p>
<p class="MsoNormal" style="text-indent: 0.5in;"><span style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">Thanks again.</span></p>
<p class="MsoNormal" style=""><span style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal" style=""><span style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">Regards</span></p>
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</span></p>
<p class="MsoNormal" style=""><span style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"> </span></p>
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<p class="MsoNormal" style=""><b><span style="font-size: 10pt; font-family: "Tahoma","sans-serif";">From:</span></b><span style="font-size: 10pt; font-family: "Tahoma","sans-serif";"> dhcp-users-bounces+mailinglists=<a href="mailto:bluezonejordan.com@lists.isc.org" target="_blank">bluezonejordan.com@lists.isc.org</a>
[mailto:<a href="mailto:dhcp-users-bounces%2Bmailinglists" target="_blank">dhcp-users-bounces+mailinglists</a>=<a href="mailto:bluezonejordan.com@lists.isc.org" target="_blank">bluezonejordan.com@lists.isc.org</a>]
<b>On Behalf Of </b>José Queiroz<br>
<b>Sent:</b> Sunday, February 12, 2012 8:48 PM<br>
<b>To:</b> Users of ISC DHCP<br>
<b>Subject:</b> Re: Duplicated IP's</span></p>
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<p class="MsoNormal" style="">2012/2/12 Moayad mohammad <<a href="mailto:mailinglists@bluezonejordan.com" target="_blank">mailinglists@bluezonejordan.com</a>></p>
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<p class="MsoNormal" style="">Dears,</p>
<p class="MsoNormal" style=""> I am facing problems with my DHCP server to serve our WiMAX customers (DHCP Version: dhcp-4.2.1-P1) as follows:</p>
<p style="margin-left: 0.75in;">1-<span style="font-size: 7pt;"> </span>sometimes the dhcpd service provide CPE with duplicated IP’s (Already assigned or reserved to other CPE), so the CPE connect for 1-2 seconds then disconnected then try again to connect
and get the same duplicated IP then disconnected. To solve this issue I have to add new pool of IP’s.</p>
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I remember a similar case, it was happening because the CPE were sending the same DHCP ID, or a bogus one (all zeros). Can you watch DHCP logs, and see what the problematic CPEs send to you?
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