<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<meta name="Generator" content="Microsoft Word 14 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri","sans-serif";
mso-fareast-language:EN-US;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="EN-GB" link="blue" vlink="purple">
<div class="WordSection1">
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">So similar issue. I think that with failover, both servers are allowed to respond to a request for an existing lease. However, I though the backup would only
respond if it has lost comms with the primary (i.e. the failover link had died and so the backup peer thought the primary was dead). However, this is not what we both seem to observe.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">--<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Leigh<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> dhcp-users-bounces+leigh.porter=ukbroadband.com@lists.isc.org
[mailto:dhcp-users-bounces+leigh.porter=ukbroadband.com@lists.isc.org] <b>On Behalf Of
</b>Joey D.<br>
<b>Sent:</b> 02 April 2014 17:36<br>
<b>To:</b> dhcp-users@lists.isc.org<br>
<b>Subject:</b> Multiple ACK Issue<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Below is my pastebin link to a text diagram of what we witness is happening in the event of a device reboot of a previously connected device (meaning the device is already
established in the leases db on both servers), as well as our failover config. Is there a configuration directive that can be used which mandates that only the server sending the offer can send the ACK? (much like what is done when allocating a fresh lease
like in sec 3.2 in the rfc). I can detail a bit more as to the environment layout if necessary, but I'm hoping there is an option I'm simply overlooking. </span><o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif""><a href="http://pastebin.com/xvBXxz6P">http://pastebin.com/xvBXxz6P</a></span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">Regards,</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">Joey D.</span><o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><br>
______________________________________________________________________<br>
This email has been scanned by the Symantec Email Security.cloud service.<br>
For more information please visit <a href="http://www.symanteccloud.com">http://www.symanteccloud.com</a><br>
______________________________________________________________________<o:p></o:p></p>
</div>
<br clear="both">
______________________________________________________________________<BR>
This email has been scanned by the Symantec Email Security.cloud service.<BR>
For more information please visit http://www.symanteccloud.com<BR>
______________________________________________________________________<BR>
</body>
</html>