<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: Andale Mono; font-size: 10pt; color: #000000'>I believe it is UDP. You should post your failover config from the primary and secondary here. There could be some problem in it that someone will see.<br><br><div><br></div><hr id="zwchr"><blockquote style="border-left:2px solid rgb(16, 16, 255);margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><b>From: </b>"Smith Bill" <Bill.Smith@uk.fujitsu.com><br><b>To: </b>dhcp-users@lists.isc.org<br><b>Sent: </b>Wednesday, March 14, 2012 10:20:36 AM<br><b>Subject: </b>Failover communication<br><br><style><!--
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</o:shapelayout></xml><![endif]--><div class="WordSection1"><p class="MsoNormal">Hi</p><p class="MsoNormal"> </p><p class="MsoNormal">Does anyone have any detailed information regarding the communication that happens between two dhcp servers configured for failover – I have two servers that don’t seem to talk to each other and the tcpdump is showing block icmp traffic so I guess I need to know if dhcp communicates with its failover partner via icmp.</p><p class="MsoNormal"> </p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Regards</span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Bill Smith</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif""></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Senior Solutions Architect</span></p><p class="MsoNormal" style="mso-margin-top-alt:0cm;margin-right:3.75pt;margin-bottom:0cm;margin-left:3.75pt;margin-bottom:.0001pt"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Architecture & Design H&NS North</span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Fujitsu Services</span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Tel: 07867 821165</span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Email:bill.smith@uk.fujitsu.com</span></p><p class="MsoNormal"> </p><p class="MsoNormal"> </p></div><br clear="both">
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