<div dir="ltr">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.</div>
<div class="gmail_extra"><br><br><div class="gmail_quote">On Mon, Aug 25, 2014 at 11:23 AM, Taeheum Na <span dir="ltr"><<a href="mailto:thna@nm.gist.ac.kr" target="_blank">thna@nm.gist.ac.kr</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div lang="KO" link="#0563C1" vlink="#954F72"><div><p class="MsoNormal" align="left" style="margin-bottom:10.5pt;text-align:left;background:white;text-autospace:ideograph-numeric ideograph-other;word-break:keep-all"><span lang="EN-US" style="font-size:10.5pt;font-family:"Arial","sans-serif";color:#4b4b4b">Hello, I tried to measure network performance BTW VM which connected through GRE tunnel. So, I configured neutron(ML2/GRE). <u></u><u></u></span></p>
<p class="MsoNormal" align="left" style="margin-bottom:10.5pt;text-align:left;background:white;text-autospace:ideograph-numeric ideograph-other;word-break:keep-all"><span lang="EN-US" style="font-size:10.5pt;font-family:"Arial","sans-serif";color:#4b4b4b">Then I verified TCP performance between VMs which are placed on same host. <u></u><u></u></span></p>
<p class="MsoNormal" align="left" style="margin-bottom:10.5pt;text-align:left;background:white;text-autospace:ideograph-numeric ideograph-other;word-break:keep-all"><span lang="EN-US" style="font-size:10.5pt;font-family:"Arial","sans-serif";color:#4b4b4b">But I could not make Iperf connection BTW VMs (on other host), but ping is ok.<u></u><u></u></span></p>
<p class="MsoNormal" align="left" style="margin-bottom:10.5pt;text-align:left;background:white;text-autospace:ideograph-numeric ideograph-other;word-break:keep-all"><span lang="EN-US" style="font-size:10.5pt;font-family:"Arial","sans-serif";color:#4b4b4b">bellow things are current Security group configuration. I think that I allow all traffic which is needed to execute iperf.<u></u><u></u></span></p>
<div style="border:solid #888888 1.0pt;padding:2.0pt 2.0pt 2.0pt 2.0pt;background:whitesmoke"><p class="MsoNormal" align="left" style="margin-bottom:13.5pt;text-align:left;line-height:13.5pt;background:whitesmoke;text-autospace:ideograph-numeric ideograph-other;border:none;padding:0cm">
<span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">+-------------+-----------+---------+-----------+--------------+</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"><u></u><u></u></span></p>
<p class="MsoNormal" align="left" style="margin-bottom:13.5pt;text-align:left;line-height:13.5pt;background:whitesmoke;text-autospace:ideograph-numeric ideograph-other;border:none;padding:0cm"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">|</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> IP </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#660066;border:none windowtext 1.0pt;padding:0cm">Protocol</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">|</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#660066;border:none windowtext 1.0pt;padding:0cm">From</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#660066;border:none windowtext 1.0pt;padding:0cm">Port</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">|</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#660066;border:none windowtext 1.0pt;padding:0cm">To</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#660066;border:none windowtext 1.0pt;padding:0cm">Port</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">|</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> IP </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#660066;border:none windowtext 1.0pt;padding:0cm">Range</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">|</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#660066;border:none windowtext 1.0pt;padding:0cm">Source</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#660066;border:none windowtext 1.0pt;padding:0cm">Group</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">|</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"><u></u><u></u></span></p>
<p class="MsoNormal" align="left" style="margin-bottom:13.5pt;text-align:left;line-height:13.5pt;background:whitesmoke;text-autospace:ideograph-numeric ideograph-other;border:none;padding:0cm"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">+-------------+-----------+---------+-----------+--------------+</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"><u></u><u></u></span></p>
<p class="MsoNormal" align="left" style="margin-bottom:13.5pt;text-align:left;line-height:13.5pt;background:whitesmoke;text-autospace:ideograph-numeric ideograph-other;border:none;padding:0cm"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">|</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> udp </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">|</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#006666;border:none windowtext 1.0pt;padding:0cm">1</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">|</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#006666;border:none windowtext 1.0pt;padding:0cm">65535</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">|</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#006666;border:none windowtext 1.0pt;padding:0cm">0.0</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">.</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#006666;border:none windowtext 1.0pt;padding:0cm">0.0</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">/</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#006666;border:none windowtext 1.0pt;padding:0cm">0</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">|</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">|</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"><u></u><u></u></span></p>
<p class="MsoNormal" align="left" style="margin-bottom:13.5pt;text-align:left;line-height:13.5pt;background:whitesmoke;text-autospace:ideograph-numeric ideograph-other;border:none;padding:0cm"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">|</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> tcp </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">|</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#006666;border:none windowtext 1.0pt;padding:0cm">1</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">|</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#006666;border:none windowtext 1.0pt;padding:0cm">65535</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">|</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#006666;border:none windowtext 1.0pt;padding:0cm">0.0</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">.</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#006666;border:none windowtext 1.0pt;padding:0cm">0.0</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">/</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#006666;border:none windowtext 1.0pt;padding:0cm">0</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">|</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">|</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"><u></u><u></u></span></p>
<p class="MsoNormal" align="left" style="margin-bottom:13.5pt;text-align:left;line-height:13.5pt;background:whitesmoke;text-autospace:ideograph-numeric ideograph-other;border:none;padding:0cm"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">|</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> icmp </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">|</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">-</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#006666;border:none windowtext 1.0pt;padding:0cm">1</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">|</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">-</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#006666;border:none windowtext 1.0pt;padding:0cm">1</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">|</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#006666;border:none windowtext 1.0pt;padding:0cm">0.0</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">.</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#006666;border:none windowtext 1.0pt;padding:0cm">0.0</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">/</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#006666;border:none windowtext 1.0pt;padding:0cm">0</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">|</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"> </span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">|</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:black;border:none windowtext 1.0pt;padding:0cm"><u></u><u></u></span></p>
<p class="MsoNormal" align="left" style="margin-bottom:13.5pt;text-align:left;line-height:13.5pt;background:whitesmoke;text-autospace:ideograph-numeric ideograph-other;border:none;padding:0cm"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#666600;border:none windowtext 1.0pt;padding:0cm">+-------------+-----------+---------+-----------+--------------+</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";color:#333333"><u></u><u></u></span></p>
</div><p class="MsoNormal"><span lang="EN-US">Do you have any comment?<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US" style="font-family:Consolas;color:black">Regards<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:Consolas;color:black">Taeheum Na<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US" style="font-family:Consolas;color:black">****************************************************<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:Consolas;color:black">M.S. candidate of Networked Computing Systems Lab.<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US" style="font-family:Consolas;color:black">School of Information and Communications<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:Consolas;color:black">GIST (Gwangju Inst. of Sci. and Tech.)<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US" style="font-family:Consolas;color:black">E-mail: <a href="mailto:thna@nm.gist.ac.kr" target="_blank"><span style="color:blue">thna@nm.gist.ac.kr</span></a><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:Consolas;color:black">Phone: <a href="tel:%2B82-10-2238-9424" value="+821022389424" target="_blank">+82-10-2238-9424</a><u></u><u></u></span></p><p class="MsoNormal">
<span lang="EN-US" style="font-family:Consolas;color:black">Office: <a href="tel:%2B82-62-715-2273" value="+82627152273" target="_blank">+82-62-715-2273</a></span><span lang="EN-US"><u></u><u></u></span></p><p class="MsoNormal">
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