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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Since this is the secondary, mclt should not be set... but I did test this as the documentation standard 3600 as a test with no change.<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="divRpF899815"><font color="#000000" face="Tahoma" size="2"><b>From:</b> dhcp-users-bounces+rgrimsha=syr.edu@lists.isc.org [dhcp-users-bounces+rgrimsha=syr.edu@lists.isc.org] on behalf of perl-list [perl-list@network1.net]<br>
<b>Sent:</b> Tuesday, August 07, 2012 2:29 PM<br>
<b>To:</b> Users of ISC DHCP<br>
<b>Subject:</b> Re: critical FYI secondary in partner-down<br>
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<span style="color: rgb(0, 0, 0); font-family: arial,helvetica,sans-serif; font-size: 10pt;">what is your mclt set to?</span>
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<div style="color: rgb(0, 0, 0); font-size: 10pt;"><font face="courier new, courier, monaco, monospace, sans-serif">failover peer "dhcp" {</font></div>
<div style="color: rgb(0, 0, 0); font-size: 10pt;"><font face="courier new, courier, monaco, monospace, sans-serif"> primary;</font></div>
<div style="color: rgb(0, 0, 0); font-size: 10pt;"><font face="courier new, courier, monaco, monospace, sans-serif"> address
<i>x.x.x.x</i>;</font></div>
<div style="color: rgb(0, 0, 0); font-size: 10pt;"><font face="courier new, courier, monaco, monospace, sans-serif"> port
<i>N</i>;</font></div>
<div style="color: rgb(0, 0, 0); font-size: 10pt;"><font face="courier new, courier, monaco, monospace, sans-serif"> peer address
<i>x.x.x.x</i>;</font></div>
<div style="color: rgb(0, 0, 0); font-size: 10pt;"><font face="courier new, courier, monaco, monospace, sans-serif"> peer port
<i>N</i>;</font></div>
<div style="color: rgb(0, 0, 0); font-size: 10pt;"><font face="courier new, courier, monaco, monospace, sans-serif">
<span style="background-color: rgb(248, 250, 51);"><b>mclt 990;</b></span></font></div>
<div style="color: rgb(0, 0, 0); font-size: 10pt;"><font face="courier new, courier, monaco, monospace, sans-serif"> split 128;</font></div>
<div style="color: rgb(0, 0, 0); font-size: 10pt;"><font face="courier new, courier, monaco, monospace, sans-serif"> max-response-delay 60;</font></div>
<div style="color: rgb(0, 0, 0); font-size: 10pt;"><font face="courier new, courier, monaco, monospace, sans-serif"> max-unacked-updates 10;</font></div>
<div style="color: rgb(0, 0, 0); font-size: 10pt;"><font face="courier new, courier, monaco, monospace, sans-serif"> load balance max seconds 5;</font></div>
<div style="color: rgb(0, 0, 0); font-size: 10pt;"><font face="courier new, courier, monaco, monospace, sans-serif">}</font></div>
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mclt is only set on the primary and determines the length of leases when in failover on the non-primary ... from the man page:</div>
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<div><font face="courier new, courier, monaco, monospace, sans-serif" size="2">The mclt statement</font></div>
<div><font face="courier new, courier, monaco, monospace, sans-serif" size="2"><br>
</font></div>
<div><font face="courier new, courier, monaco, monospace, sans-serif" size="2"> mclt seconds;</font></div>
<div><font face="courier new, courier, monaco, monospace, sans-serif" size="2"><br>
</font></div>
<div><font face="courier new, courier, monaco, monospace, sans-serif" size="2"> The mclt statement defines the Maximum Client Lead Time. It must be specified on the primary, and may not be specified on the secondary. This is the length of
time for which a lease may be renewed by either failover peer without contacting the</font></div>
<div><font face="courier new, courier, monaco, monospace, sans-serif" size="2"> other. The longer you set this, the longer it will take for the running server to recover IP addresses after moving into PARTNER-DOWN state. The shorter you set it,
the more load your servers will experience when they are not communicating. A</font></div>
<div><font face="courier new, courier, monaco, monospace, sans-serif" size="2"> value of something like 3600 is probably reasonable, but again bear in mind that we have no real operational experience with this.</font></div>
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<b>From: </b>"Randall C Grimshaw" <rgrimsha@syr.edu><br>
<b>To: </b>dhcp-users@lists.isc.org<br>
<b>Sent: </b>Tuesday, August 7, 2012 2:21:48 PM<br>
<b>Subject: </b>critical FYI secondary in partner-down<br>
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Internet Systems Consortium DHCP Server 4.1.1-P1 as distributed by Red Hat Enterprise Linux Server release 6.3 (Santiago) and possibly other versions.<br>
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To my great surprise when I brought up my secondary in partner-down mode, all of the leases issued had a zero duration. This was quite disruptive - All of my windows machines with dynamic leases failed.<br>
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The work-around is to change the server to primary. (but it took a bit of work and dented reputation to determine this)<br>
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FYI FYI FYI<br>
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has anyone else seen this?<br>
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Randall Grimshaw rgrimsha@syr.edu<br>
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