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<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">I see a similar issue with a similar config, however the duplicate ACK is not on the initial request but for lease renewals.<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">I’ve not bothered investigating so far as it seemed to do no harm for now..<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"><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 17:04<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" style="margin-bottom:12.0pt"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> Below is a 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. <br>
<br>
<br>
</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> Server A Client Server B<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> v v v<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> | | |<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> | Begins initialization |<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> | | |<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> | _____________/|\____________ |<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> |/DHCPDISCOVER | DHCPDISCOVER\|<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> | | |<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> | | |<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> | | ___________/|<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> | | /DHCPOFFER |<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> | |/ |<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> | Selects configuration |<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> | | |<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> | _____________/|\____________ |<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> |/ DHCPREQUEST | DHCPREQUEST\|<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> | | |<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> | | |<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> | | |<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> |\_____________ | ____________/|<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> | DHCPACK \|/ DHCPACK |<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> | | |<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> | Initialization complete | <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> <br>
<br>
SERVER A: <br>
stash-agent-options true; <br>
<br>
failover peer "iah-kcm" { <br>
primary; <br>
address x.x.1.248; <br>
port 647; <br>
peer address x.x.2.248; <br>
peer port 647; <br>
auto-partner-down 121; <br>
max-response-delay 120; <br>
max-unacked-updates 10; <br>
load balance max seconds 5; <br>
mclt 3600; <br>
split 128; <br>
<br>
} <br>
server-identifier x.x.1.248; <br>
ping-check false; <br>
<br>
<br>
SERVER B: <br>
stash-agent-options true; <br>
<br>
failover peer "iah-kcm" { <br>
<br>
secondary; <br>
address x.x.2.248; <br>
port 647; <br>
peer address x.x.1.248; <br>
peer port 647; <br>
auto-partner-down 121; <br>
max-response-delay 120; <br>
max-unacked-updates 10; <br>
load balance max seconds 5; <br>
} <br>
server-identifier x.x.2.248; <br>
ping-check false; <br>
<br>
<br>
- Joey D. </span><o:p></o:p></p>
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