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<div class="moz-cite-prefix">We usually serves reduced MTU to
instances via DHCP option:<br>
<br>
(at network node for neutron)<br>
/etc/neutron/dnsmasq-neutron.conf:<br>
dhcp-option-force=26,1476<br>
<br>
On 08/26/2014 05:19 AM, Taeheum Na wrote:<br>
</div>
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<p class="MsoNormal" style="word-break:break-hangul"><span
style="font-size:10.0pt;font-family:"Malgun
Gothic";color:#1F497D" lang="EN-US">Hello, David<o:p></o:p></span></p>
<p class="MsoNormal" style="word-break:break-hangul"><span
style="font-size:10.0pt;font-family:"Malgun
Gothic";color:#1F497D" lang="EN-US">Your comment was
exactly correct!!<o:p></o:p></span></p>
<p class="MsoNormal" style="word-break:break-hangul"><span
style="font-size:10.0pt;font-family:"Malgun
Gothic";color:#1F497D" lang="EN-US">I refer following
blog. Then adjust MTU on the VM<o:p></o:p></span></p>
<p class="MsoNormal" style="word-break:break-hangul"><span
style="font-size:10.0pt;font-family:"Malgun
Gothic";color:#1F497D" lang="EN-US">And current it’s
work well.<o:p></o:p></span></p>
<p class="MsoNormal" style="word-break:break-hangul"><span
lang="EN-US"><a moz-do-not-send="true"
href="http://techbackground.blogspot.kr/2013/06/path-mtu-discovery-and-gre.html">http://techbackground.blogspot.kr/2013/06/path-mtu-discovery-and-gre.html</a></span><span
style="font-size:10.0pt;font-family:"Malgun
Gothic";color:#1F497D" lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="word-break:break-hangul"><span
style="font-size:10.0pt;font-family:"Malgun
Gothic";color:#1F497D" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="word-break:break-hangul"><span
style="font-size:10.0pt;font-family:"Malgun
Gothic";color:#1F497D" lang="EN-US">Thank you for your
comment.<o:p></o:p></span></p>
<p class="MsoNormal" style="word-break:break-hangul"><span
style="font-size:10.0pt;font-family:"Malgun
Gothic";color:#1F497D" lang="EN-US">It was helpful to
save my time.<o:p></o:p></span></p>
<p class="MsoNormal" style="word-break:break-hangul"><span
style="font-size:10.0pt;font-family:"Malgun
Gothic";color:#1F497D" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""
lang="EN-US">From:</span></b><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""
lang="EN-US"> <a class="moz-txt-link-abbreviated" href="mailto:medberry@gmail.com">medberry@gmail.com</a> [<a class="moz-txt-link-freetext" href="mailto:medberry@gmail.com">mailto:medberry@gmail.com</a>]
<b>On Behalf Of </b>David Medberry<br>
<b>Sent:</b> Tuesday, August 26, 2014 1:40 AM<br>
<b>To:</b> Taeheum Na<br>
<b>Cc:</b> <a class="moz-txt-link-abbreviated" href="mailto:openstack-operators@lists.openstack.org">openstack-operators@lists.openstack.org</a><br>
<b>Subject:</b> Re: [Openstack-operators] Iperf isn't work
between VMs which are placed in other host<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span lang="EN-US">What MTU are you using
(try different ping sizes to see if this problem also
occurs with large pings.) You will likely want to limit
the vms to 1454 MTU and re-run your tests. Google for GRE
OPENSTACK MTU for more info.<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span
lang="EN-US"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span lang="EN-US">On Mon, Aug 25, 2014
at 11:23 AM, Taeheum Na <<a moz-do-not-send="true"
href="mailto:thna@nm.gist.ac.kr" target="_blank">thna@nm.gist.ac.kr</a>>
wrote:<o:p></o:p></span></p>
<blockquote style="border:none;border-left:solid #CCCCCC
1.0pt;padding:0cm 0cm 0cm
6.0pt;margin-left:4.8pt;margin-right:0cm">
<div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;margin-bottom:10.5pt;background:white;text-autospace:ideograph-other"><span
style="font-size:10.5pt;font-family:"Arial","sans-serif";color:#4B4B4B"
lang="EN-US">Hello, I tried to measure network
performance BTW VM which connected through GRE
tunnel. So, I configured neutron(ML2/GRE). </span><span
lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;margin-bottom:10.5pt;background:white;text-autospace:ideograph-other"><span
style="font-size:10.5pt;font-family:"Arial","sans-serif";color:#4B4B4B"
lang="EN-US">Then I verified TCP performance
between VMs which are placed on same host. </span><span
lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;margin-bottom:10.5pt;background:white;text-autospace:ideograph-other"><span
style="font-size:10.5pt;font-family:"Arial","sans-serif";color:#4B4B4B"
lang="EN-US">But I could not make Iperf connection
BTW VMs (on other host), but ping is ok.</span><span
lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;margin-bottom:10.5pt;background:white;text-autospace:ideograph-other"><span
style="font-size:10.5pt;font-family:"Arial","sans-serif";color:#4B4B4B"
lang="EN-US">bellow things are current Security
group configuration. I think that I allow all
traffic which is needed to execute iperf.</span><span
lang="EN-US"><o:p></o:p></span></p>
<div style="border:solid #888888 1.0pt;padding:2.0pt
2.0pt 2.0pt 2.0pt">
<p class="MsoNormal"
style="mso-margin-top-alt:auto;margin-bottom:13.5pt;line-height:13.5pt;background:whitesmoke;text-autospace:ideograph-other"><span
style="font-size:9.0pt;font-family:"Courier
New";color:#666600;border:none windowtext
1.0pt;padding:0cm" lang="EN-US">+-------------+-----------+---------+-----------+--------------+</span><span
lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;margin-bottom:13.5pt;line-height:13.5pt;background:whitesmoke;text-autospace:ideograph-other"><span
style="font-size:9.0pt;font-family:"Courier
New";color:#666600;border:none windowtext
1.0pt;padding:0cm" lang="EN-US">|</span><span
style="font-size:9.0pt;font-family:"Courier
New";color:black;border:none windowtext
1.0pt;padding:0cm" lang="EN-US"> IP </span><span
style="font-size:9.0pt;font-family:"Courier
New";color:#660066;border:none windowtext
1.0pt;padding:0cm" lang="EN-US">Protocol</span><span
style="font-size:9.0pt;font-family:"Courier
New";color:black;border:none windowtext
1.0pt;padding:0cm" lang="EN-US"> </span><span
style="font-size:9.0pt;font-family:"Courier
New";color:#666600;border:none windowtext
1.0pt;padding:0cm" lang="EN-US">|</span><span
style="font-size:9.0pt;font-family:"Courier
New";color:black;border:none windowtext
1.0pt;padding:0cm" lang="EN-US"> </span><span
style="font-size:9.0pt;font-family:"Courier
New";color:#660066;border:none windowtext
1.0pt;padding:0cm" lang="EN-US">From</span><span
style="font-size:9.0pt;font-family:"Courier
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1.0pt;padding:0cm" lang="EN-US"> </span><span
style="font-size:9.0pt;font-family:"Courier
New";color:#660066;border:none windowtext
1.0pt;padding:0cm" lang="EN-US">Port</span><span
style="font-size:9.0pt;font-family:"Courier
New";color:black;border:none windowtext
1.0pt;padding:0cm" lang="EN-US"> </span><span
style="font-size:9.0pt;font-family:"Courier
New";color:#666600;border:none windowtext
1.0pt;padding:0cm" lang="EN-US">|</span><span
style="font-size:9.0pt;font-family:"Courier
New";color:black;border:none windowtext
1.0pt;padding:0cm" lang="EN-US"> </span><span
style="font-size:9.0pt;font-family:"Courier
New";color:#660066;border:none windowtext
1.0pt;padding:0cm" lang="EN-US">To</span><span
style="font-size:9.0pt;font-family:"Courier
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1.0pt;padding:0cm" lang="EN-US"> </span><span
style="font-size:9.0pt;font-family:"Courier
New";color:#660066;border:none windowtext
1.0pt;padding:0cm" lang="EN-US">Port</span><span
style="font-size:9.0pt;font-family:"Courier
New";color:black;border:none windowtext
1.0pt;padding:0cm" lang="EN-US"> </span><span
style="font-size:9.0pt;font-family:"Courier
New";color:#666600;border:none windowtext
1.0pt;padding:0cm" lang="EN-US">|</span><span
style="font-size:9.0pt;font-family:"Courier
New";color:black;border:none windowtext
1.0pt;padding:0cm" lang="EN-US"> IP </span><span
style="font-size:9.0pt;font-family:"Courier
New";color:#660066;border:none windowtext
1.0pt;padding:0cm" lang="EN-US">Range</span><span
style="font-size:9.0pt;font-family:"Courier
New";color:black;border:none windowtext
1.0pt;padding:0cm" lang="EN-US"> </span><span
style="font-size:9.0pt;font-family:"Courier
New";color:#666600;border:none windowtext
1.0pt;padding:0cm" lang="EN-US">|</span><span
style="font-size:9.0pt;font-family:"Courier
New";color:black;border:none windowtext
1.0pt;padding:0cm" lang="EN-US"> </span><span
style="font-size:9.0pt;font-family:"Courier
New";color:#660066;border:none windowtext
1.0pt;padding:0cm" lang="EN-US">Source</span><span
style="font-size:9.0pt;font-family:"Courier
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1.0pt;padding:0cm" lang="EN-US"> </span><span
style="font-size:9.0pt;font-family:"Courier
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1.0pt;padding:0cm" lang="EN-US">Group</span><span
style="font-size:9.0pt;font-family:"Courier
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1.0pt;padding:0cm" lang="EN-US"> </span><span
style="font-size:9.0pt;font-family:"Courier
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1.0pt;padding:0cm" lang="EN-US">|</span><span
lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;margin-bottom:13.5pt;line-height:13.5pt;background:whitesmoke;text-autospace:ideograph-other"><span
style="font-size:9.0pt;font-family:"Courier
New";color:#666600;border:none windowtext
1.0pt;padding:0cm" lang="EN-US">+-------------+-----------+---------+-----------+--------------+</span><span
lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;margin-bottom:13.5pt;line-height:13.5pt;background:whitesmoke;text-autospace:ideograph-other"><span
style="font-size:9.0pt;font-family:"Courier
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1.0pt;padding:0cm" lang="EN-US">|</span><span
style="font-size:9.0pt;font-family:"Courier
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1.0pt;padding:0cm" lang="EN-US"> udp </span><span
style="font-size:9.0pt;font-family:"Courier
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1.0pt;padding:0cm" lang="EN-US">|</span><span
style="font-size:9.0pt;font-family:"Courier
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1.0pt;padding:0cm" lang="EN-US"> </span><span
style="font-size:9.0pt;font-family:"Courier
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1.0pt;padding:0cm" lang="EN-US">1</span><span
style="font-size:9.0pt;font-family:"Courier
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1.0pt;padding:0cm" lang="EN-US"> </span><span
style="font-size:9.0pt;font-family:"Courier
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1.0pt;padding:0cm" lang="EN-US">|</span><span
style="font-size:9.0pt;font-family:"Courier
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1.0pt;padding:0cm" lang="EN-US"> </span><span
style="font-size:9.0pt;font-family:"Courier
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1.0pt;padding:0cm" lang="EN-US">65535</span><span
style="font-size:9.0pt;font-family:"Courier
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1.0pt;padding:0cm" lang="EN-US"> </span><span
style="font-size:9.0pt;font-family:"Courier
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1.0pt;padding:0cm" lang="EN-US">|</span><span
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1.0pt;padding:0cm" lang="EN-US">|</span><span
style="font-size:9.0pt;font-family:"Courier
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style="font-size:9.0pt;font-family:"Courier
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lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;margin-bottom:13.5pt;line-height:13.5pt;background:whitesmoke;text-autospace:ideograph-other"><span
style="font-size:9.0pt;font-family:"Courier
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1.0pt;padding:0cm" lang="EN-US">|</span><span
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style="font-size:9.0pt;font-family:"Courier
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style="font-size:9.0pt;font-family:"Courier
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<p class="MsoNormal"
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style="font-size:9.0pt;font-family:"Courier
New";color:#666600;border:none windowtext
1.0pt;padding:0cm" lang="EN-US">.</span><span
style="font-size:9.0pt;font-family:"Courier
New";color:#006666;border:none windowtext
1.0pt;padding:0cm" lang="EN-US">0.0</span><span
style="font-size:9.0pt;font-family:"Courier
New";color:#666600;border:none windowtext
1.0pt;padding:0cm" lang="EN-US">/</span><span
style="font-size:9.0pt;font-family:"Courier
New";color:#006666;border:none windowtext
1.0pt;padding:0cm" lang="EN-US">0</span><span
style="font-size:9.0pt;font-family:"Courier
New";color:black;border:none windowtext
1.0pt;padding:0cm" lang="EN-US"> </span><span
style="font-size:9.0pt;font-family:"Courier
New";color:#666600;border:none windowtext
1.0pt;padding:0cm" lang="EN-US">|</span><span
style="font-size:9.0pt;font-family:"Courier
New";color:black;border:none windowtext
1.0pt;padding:0cm" lang="EN-US"> </span><span
style="font-size:9.0pt;font-family:"Courier
New";color:#666600;border:none windowtext
1.0pt;padding:0cm" lang="EN-US">|</span><span
lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;margin-bottom:13.5pt;line-height:13.5pt;background:whitesmoke;text-autospace:ideograph-other"><span
style="font-size:9.0pt;font-family:"Courier
New";color:#666600;border:none windowtext
1.0pt;padding:0cm" lang="EN-US">+-------------+-----------+---------+-----------+--------------+</span><span
lang="EN-US"><o:p></o:p></span></p>
</div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
lang="EN-US">Do you have any comment?<o:p></o:p></span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:Consolas;color:black"
lang="EN-US">Regards</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:Consolas;color:black"
lang="EN-US">Taeheum Na</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:Consolas;color:black"
lang="EN-US">****************************************************</span><span
lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:Consolas;color:black"
lang="EN-US">M.S. candidate of Networked Computing
Systems Lab.</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:Consolas;color:black"
lang="EN-US">School of Information and
Communications</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:Consolas;color:black"
lang="EN-US">GIST (Gwangju Inst. of Sci. and
Tech.)</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:Consolas;color:black"
lang="EN-US">E-mail: <a moz-do-not-send="true"
href="mailto:thna@nm.gist.ac.kr" target="_blank">thna@nm.gist.ac.kr</a></span><span
lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:Consolas;color:black"
lang="EN-US">Phone: <a moz-do-not-send="true"
href="tel:%2B82-10-2238-9424" target="_blank">+82-10-2238-9424</a></span><span
lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:Consolas;color:black"
lang="EN-US">Office: <a moz-do-not-send="true"
href="tel:%2B82-62-715-2273" target="_blank">+82-62-715-2273</a></span><span
lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
lang="EN-US"> <o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span
lang="EN-US"><br>
_______________________________________________<br>
OpenStack-operators mailing list<br>
<a moz-do-not-send="true"
href="mailto:OpenStack-operators@lists.openstack.org">OpenStack-operators@lists.openstack.org</a><br>
<a moz-do-not-send="true"
href="http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators"
target="_blank">http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators</a><o:p></o:p></span></p>
</blockquote>
</div>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
</div>
</div>
<br>
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<br>
<pre wrap="">_______________________________________________
OpenStack-operators mailing list
<a class="moz-txt-link-abbreviated" href="mailto:OpenStack-operators@lists.openstack.org">OpenStack-operators@lists.openstack.org</a>
<a class="moz-txt-link-freetext" href="http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators">http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators</a>
</pre>
</blockquote>
<br>
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