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<font face="Dialog" size="2">Ausmus,</font> </p>
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<font face="Dialog" size="2">The split value is primarily used to indicate the load balancing between the primary and secondary DHCP server. </font> </p>
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<font face="Dialog" size="2">There are three possible split values</font> </p>
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<font face="Dialog" size="2">255 - Primary answers all the requests</font> </p>
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<font face="Dialog" size="2">0 - Secondary answers all the requests</font> </p>
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<font face="Dialog" size="2">128 - Both the primary and secondary reply in an even manner </font> </p>
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<font face="Dialog" size="2">The man page suggests that the only meaningful value for the Split is 128 (For load Balancing)</font> </p>
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<font face="Dialog" size="2">In any of the above cases, if any of the server fails , remaining server should be able to allocate the IP addresses in free state.</font><br><br>>>> "Ausmus, Matt" <mausmus@chapman.edu> 8/26/2010 10:51 PM >>><br> </p>
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<span style="font-size: 11.0pt; font-family: Calibri,sans-serif; color: #1F497D"><SPAN STYLE='FONT-FAMILY:"Calibri,sans-serif" ;FONT-SIZE:"11.0pt" ;COLOR:"#1F497D"'>I have a question about setting the Split Value to 255. Everything I’ve read says to leave the split value at 128 because this generates an even split between the two servers. Does setting the Split Value to 255 still allocate free IPs in a 50/50 manner while both servers are up but if one server fails it allows the remaining server to access all free leases if needed?<o style="font-size: 11.0pt; color: #1F497D; font-family: Calibri,sans-serif" p="#DEFAULT"></o style="font-size: 11.0pt; color: #1F497D; font-family: Calibri,sans-serif"></SPAN></span> </p>
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<span style="font-size: 11.0pt; font-family: Calibri,sans-serif; color: #1F497D"><SPAN STYLE='FONT-FAMILY:"Calibri,sans-serif" ;FONT-SIZE:"11.0pt" ;COLOR:"#1F497D"'><o style="font-size: 11.0pt; color: #1F497D; font-family: Calibri,sans-serif" p="#DEFAULT">
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<span style="font-size: 11.0pt; font-family: Calibri,sans-serif; color: #1F497D"><SPAN STYLE='FONT-FAMILY:"Calibri,sans-serif" ;FONT-SIZE:"11.0pt" ;COLOR:"#1F497D"'>I’m using CentOS 5.5 which is using rpm package dhcp-3.0.5-23.el5.<o style="font-size: 11.0pt; color: #1F497D; font-family: Calibri,sans-serif" p="#DEFAULT"></o style="font-size: 11.0pt; color: #1F497D; font-family: Calibri,sans-serif"></SPAN></span> </p>
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<span style="font-size: 11.0pt; font-family: Calibri,sans-serif; color: #1F497D"><SPAN STYLE='FONT-FAMILY:"Calibri,sans-serif" ;FONT-SIZE:"11.0pt" ;COLOR:"#1F497D"'><o style="font-size: 11.0pt; color: #1F497D; font-family: Calibri,sans-serif" p="#DEFAULT">
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<span style="font-size: 11.0pt; font-family: Calibri,sans-serif; color: #1F497D"><SPAN STYLE='FONT-FAMILY:"Calibri,sans-serif" ;FONT-SIZE:"11.0pt" ;COLOR:"#1F497D"'>Thx!<o style="font-size: 11.0pt; color: #1F497D; font-family: Calibri,sans-serif" p="#DEFAULT"></o style="font-size: 11.0pt; color: #1F497D; font-family: Calibri,sans-serif"></SPAN></span> </p>
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<span style="font-size: 10.0pt; font-family: Verdana,sans-serif; color: #1F497D"><SPAN STYLE='FONT-FAMILY:"Verdana,sans-serif" ;FONT-SIZE:"10.0pt" ;COLOR:"#1F497D"'><b>____________________________<o style="font-size: 10.0pt; color: #1F497D; font-weight: bold; font-family: Verdana,sans-serif" p="#DEFAULT"></o style="font-size: 10.0pt; color: #1F497D; font-weight: bold; font-family: Verdana,sans-serif"></b></SPAN></span> </p>
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<span style="font-size: 10.0pt; font-family: Verdana,sans-serif; color: #1F497D"><SPAN STYLE='FONT-FAMILY:"Verdana,sans-serif" ;FONT-SIZE:"10.0pt" ;COLOR:"#1F497D"'><b>Matt Ausmus<o style="font-size: 10.0pt; color: #1F497D; font-weight: bold; font-family: Verdana,sans-serif" p="#DEFAULT"></o style="font-size: 10.0pt; color: #1F497D; font-weight: bold; font-family: Verdana,sans-serif"></b></SPAN></span> </p>
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<span style="font-size: 7.5pt; font-family: Verdana,sans-serif; color: #1F497D"><SPAN STYLE='FONT-FAMILY:"Verdana,sans-serif" ;FONT-SIZE:"7.5pt" ;COLOR:"#1F497D"'><b>Network Administrator</b></SPAN></span><b><span style="color: #1F497D"><font color="#1F497D"><o style="color: #1F497D; font-weight: bold" p="#DEFAULT"></o style="color: #1F497D; font-weight: bold"></font></span></b> </p>
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<span style="font-size: 7.5pt; font-family: Verdana,sans-serif; color: #1F497D"><SPAN STYLE='FONT-FAMILY:"Verdana,sans-serif" ;FONT-SIZE:"7.5pt" ;COLOR:"#1F497D"'><b>Chapman</b></SPAN></span><b><span style="font-size: 8.0pt; font-family: Verdana,sans-serif; color: #1F497D"><SPAN STYLE='FONT-FAMILY:"Verdana,sans-serif" ;FONT-SIZE:"8.0pt" ;COLOR:"#1F497D"'> </SPAN></span><span style="font-size: 7.5pt; font-family: Verdana,sans-serif; color: #1F497D"><SPAN STYLE='FONT-FAMILY:"Verdana,sans-serif" ;FONT-SIZE:"7.5pt" ;COLOR:"#1F497D"'>University</SPAN></span><span style="color: #1F497D"><font color="#1F497D"><o style="color: #1F497D; font-weight: bold" p="#DEFAULT"></o style="color: #1F497D; font-weight: bold"></font></span></b> </p>
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<span style="font-size: 7.5pt; font-family: Verdana,sans-serif; color: #1F497D"><SPAN STYLE='FONT-FAMILY:"Verdana,sans-serif" ;FONT-SIZE:"7.5pt" ;COLOR:"#1F497D"'><b>635 West Palm Street</b></SPAN></span><b><span style="color: #1F497D"><font color="#1F497D"><o style="color: #1F497D; font-weight: bold" p="#DEFAULT"></o style="color: #1F497D; font-weight: bold"></font></span></b> </p>
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<span style="font-size: 7.5pt; font-family: Verdana,sans-serif; color: #1F497D"><SPAN STYLE='FONT-FAMILY:"Verdana,sans-serif" ;FONT-SIZE:"7.5pt" ;COLOR:"#1F497D"'><b>Orange,</b></SPAN></span><b><span style="font-size: 8.0pt; font-family: Verdana,sans-serif; color: #1F497D"><SPAN STYLE='FONT-FAMILY:"Verdana,sans-serif" ;FONT-SIZE:"8.0pt" ;COLOR:"#1F497D"'> </SPAN></span><span style="font-size: 7.5pt; font-family: Verdana,sans-serif; color: #1F497D"><SPAN STYLE='FONT-FAMILY:"Verdana,sans-serif" ;FONT-SIZE:"7.5pt" ;COLOR:"#1F497D"'>CA 92868</SPAN></span><span style="color: #1F497D"><font color="#1F497D"><o style="color: #1F497D; font-weight: bold" p="#DEFAULT"></o style="color: #1F497D; font-weight: bold"></font></span></b> </p>
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<span style="font-size: 7.5pt; font-family: Verdana,sans-serif; color: #1F497D"><SPAN STYLE='FONT-FAMILY:"Verdana,sans-serif" ;FONT-SIZE:"7.5pt" ;COLOR:"#1F497D"'><b>(714)628-2738</b></SPAN></span><b><span style="color: #1F497D"><font color="#1F497D"><o style="color: #1F497D; font-weight: bold" p="#DEFAULT"></o style="color: #1F497D; font-weight: bold"></font></span></b> </p>
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<span style="font-size: 7.5pt"><SPAN STYLE='FONT-FAMILY:"Verdana,sans-serif" ;FONT-SIZE:"7.5pt" ;COLOR:"#1F497D"'><b><a href="mailto:mausmus@chapman.edu">mausmus@chapman.edu</a></b></SPAN></span><b><span style="font-size: 10.0pt; font-family: Verdana,sans-serif; color: #1F497D"><SPAN STYLE='FONT-FAMILY:"Verdana,sans-serif" ;FONT-SIZE:"10.0pt" ;COLOR:"#1F497D"'><o style="font-size: 10.0pt; color: #1F497D; font-weight: bold; font-family: Verdana,sans-serif" p="#DEFAULT"></o style="font-size: 10.0pt; color: #1F497D; font-weight: bold; font-family: Verdana,sans-serif"></SPAN></span></b> </p>
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<span style="color: #A50021"><font color="#A50021"> </font></span><span style="font-size: 10.0pt; font-family: Verdana,sans-serif; color: #A50021"><SPAN STYLE='FONT-FAMILY:"Verdana,sans-serif" ;FONT-SIZE:"10.0pt" ;COLOR:"#A50021"'><o style="font-size: 10.0pt; color: #A50021; font-family: Verdana,sans-serif" p="#DEFAULT"></o style="font-size: 10.0pt; color: #A50021; font-family: Verdana,sans-serif"></SPAN></span> </p>
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<span style="font-size: 13.5pt; font-family: Comic Sans MS; color: #A50021"><SPAN STYLE='FONT-FAMILY:"Comic Sans MS" ;FONT-SIZE:"13.5pt" ;COLOR:"#A50021"'>"Nothing is ever accomplished by a reasonable man."</SPAN></span><span style="font-size: 10.0pt; font-family: Verdana,sans-serif; color: #A50021"><SPAN STYLE='FONT-FAMILY:"Verdana,sans-serif" ;FONT-SIZE:"10.0pt" ;COLOR:"#A50021"'><o style="font-size: 10.0pt; color: #A50021; font-family: Verdana,sans-serif" p="#DEFAULT"></o style="font-size: 10.0pt; color: #A50021; font-family: Verdana,sans-serif"></SPAN></span> </p>
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<span style="color: #A50021"><font color="#A50021"> </font></span><span style="font-family: Comic Sans MS; color: #A50021"><font color="#A50021" face="Comic Sans MS">-Bucy’s Law</font></span><span style="font-size: 11.0pt; font-family: Calibri,sans-serif; color: #1F497D"><SPAN STYLE='FONT-FAMILY:"Calibri,sans-serif" ;FONT-SIZE:"11.0pt" ;COLOR:"#1F497D"'><o style="font-size: 11.0pt; color: #1F497D; font-family: Calibri,sans-serif" p="#DEFAULT"></o style="font-size: 11.0pt; color: #1F497D; font-family: Calibri,sans-serif"></SPAN></span> </p>
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<span style="font-size: 10.0pt; font-family: Tahoma,sans-serif; color: black"><SPAN STYLE='FONT-FAMILY:"Tahoma,sans-serif" ;FONT-SIZE:"10.0pt" ;COLOR:"black"'><b>From:</b></SPAN></span><SPAN STYLE='FONT-FAMILY:"Tahoma,sans-serif" ;FONT-SIZE:"10.0pt" ;COLOR:"black"'><span style="font-size: 10.0pt; font-family: Tahoma,sans-serif; color: black"> Jiri Popelka [mailto:jpopelka@redhat.com]<br style="font-size: 10.0pt; font-family: Tahoma,sans-serif; color: black"><b>Sent:</b> Thursday, August 26, 2010 4:39 AM<br style="font-size: 10.0pt; font-family: Tahoma,sans-serif; color: black"><b>To:</b> Users of ISC DHCP<br style="font-size: 10.0pt; font-family: Tahoma,sans-serif; color: black"><b>Subject:</b> Re: "Peer holds all free leases"<o style="font-size: 10.0pt; color: black; font-family: Tahoma,sans-serif" p="#DEFAULT"></o style="font-size: 10.0pt; color: black; font-family: Tahoma,sans-serif"></span></SPAN> </p>
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On 08/26/2010 01:09 PM, Pooja Gada wrote: <o p="#DEFAULT"></o> </p>
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<span style="font-size: 10.0pt; font-family: Dialog,serif"><SPAN STYLE='FONT-FAMILY:"Dialog,serif" ;FONT-SIZE:"10.0pt"'>Hi ,</SPAN></span><o p="#DEFAULT"></o> </p>
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<span style="font-size: 10.0pt; font-family: Dialog,serif"><SPAN STYLE='FONT-FAMILY:"Dialog,serif" ;FONT-SIZE:"10.0pt"'>I have been observing certain issues with the failover set up i currently have.</SPAN></span><o p="#DEFAULT"></o> </p>
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<span style="font-size: 10.0pt; font-family: Dialog,serif"><SPAN STYLE='FONT-FAMILY:"Dialog,serif" ;FONT-SIZE:"10.0pt"'>I have been hitting this particular issue when i set the Split Value to 255.</SPAN></span><o p="#DEFAULT"></o> </p>
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<span style="font-size: 10.0pt; font-family: Dialog,serif"><SPAN STYLE='FONT-FAMILY:"Dialog,serif" ;FONT-SIZE:"10.0pt"'>Initially the Address Allocation for the clients works fine , and the primary and the failover server are always in sync.</SPAN></span><o p="#DEFAULT"></o> </p>
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<span style="font-size: 10.0pt; font-family: Dialog,serif"><SPAN STYLE='FONT-FAMILY:"Dialog,serif" ;FONT-SIZE:"10.0pt"'>Now when i bring down the primary server , secondary is not able to allocate all of the IP addresses which are free in the pool, after a certain time , it logs the message </SPAN></span><o p="#DEFAULT"></o> </p>
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<span style="font-size: 10.0pt; font-family: Dialog,serif"><SPAN STYLE='FONT-FAMILY:"Dialog,serif" ;FONT-SIZE:"10.0pt"'>"Peer holds all free leases".</SPAN></span><o p="#DEFAULT"></o> </p>
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<span style="font-size: 10.0pt; font-family: Dialog,serif"><SPAN STYLE='FONT-FAMILY:"Dialog,serif" ;FONT-SIZE:"10.0pt"'> And i am certain that there are certain IP addresses which are in free state and hence can be allocated , but are not allocated by the secondary server.</SPAN></span><o p="#DEFAULT"></o> </p>
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<span style="font-size: 10.0pt; font-family: Dialog,serif"><SPAN STYLE='FONT-FAMILY:"Dialog,serif" ;FONT-SIZE:"10.0pt"'>Now when i bring up the primary server , the primary is able to allocate all of the remaining IP addresses.</SPAN></span><o p="#DEFAULT"></o> </p>
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<span style="font-size: 10.0pt; font-family: Dialog,serif"><SPAN STYLE='FONT-FAMILY:"Dialog,serif" ;FONT-SIZE:"10.0pt"'>Can you let me know what may be causing this issue ?</SPAN></span><o p="#DEFAULT"></o> </p>
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<span style="font-size: 10.0pt; font-family: Dialog,serif"><SPAN STYLE='FONT-FAMILY:"Dialog,serif" ;FONT-SIZE:"10.0pt"'>Thanks,</SPAN></span><o p="#DEFAULT"></o> </p>
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<span style="font-size: 10.0pt; font-family: Dialog,serif"><SPAN STYLE='FONT-FAMILY:"Dialog,serif" ;FONT-SIZE:"10.0pt"'>Pooja</SPAN></span><o p="#DEFAULT"></o> </p>
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What is the version of dhcp you are using ?<br>This problem has been fixed in dhcp-3.1.2.<br>See<br><a href="http://www.isc.org/files/release-notes/31esv.html">http://www.isc.org/files/release-notes/31esv.html</a><br>for Changes since 3.1.1<br>* A partner-down failover server no longer emits 'peer holds all free leases' if it is able to newly-allocate one of the peer's leases.<br><br>Jiri Popelka<o p="#DEFAULT"></o>
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