<div dir="ltr">Is it being dropped by iptables? Check the following:<div><br></div><div>* Your VM using the correct IPv6 address assigned to it by Neutron<br></div><div>* The security group associated with the port allows outbound IPv6 traffic</div><div>* ensure bridge-nf-call-ip6tables is set to 1 in the kernel of the compute node</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, May 25, 2017 at 9:28 PM, <a href="mailto:zhouzhihong@cmss.chinamobile.com">zhouzhihong@cmss.chinamobile.com</a> <span dir="ltr"><<a href="mailto:zhouzhihong@cmss.chinamobile.com" target="_blank">zhouzhihong@cmss.chinamobile.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div>
<div><span></span>Hi All,</div><blockquote style="margin-top:0px;margin-bottom:0px;margin-left:0.5em"><div><div class="m_-3958623034758240046FoxDiv20170526122755033734"><div><br></div><div>I met a problem of dns packet lost in openstack environment. I need help. </div><div><br></div><div>The problem desc:</div><div><br></div><div><span style="color:rgb(0,0,0);font-size:10.5pt;line-height:1.5;background-color:rgba(0,0,0,0)">In the vm, I use "curl</span><span style="font-size:10.5pt;line-height:1.5;background-color:window"> </span><a href="http://www.baidu.com" style="font-size:10.5pt;line-height:1.5;background-color:window" target="_blank">http://www.baidu.com"</a> to do test. And the cmd takes almost 5 seconds return.</div><div>So I use tcpdump to capture the packets. And found a dns packet lost which is AAAA packet for ipv6.</div><div><br></div><div>The <span style="background-color:rgba(0,0,0,0);font-size:10.5pt;line-height:1.5">packet-lost-on-qbr.zip are the captured packets which is from qbr to qvb. It clearly shows the lost packet.</span></div><div><span style="color:rgb(0,0,0);background-color:rgba(0,0,0,0)">  </span></div><div><span style="color:rgb(0,0,0);background-color:rgba(0,0,0,0)">In my another openstack environment, the problem can not occur.  The </span><span style="background-color:rgba(0,0,0,0);font-size:10.5pt;line-height:1.5">qbr-no-packet-lost.zip is the captured packets.</span></div><div><span style="background-color:rgba(0,0,0,0);font-size:10.5pt;line-height:1.5"><br></span></div><div><span style="background-color:rgba(0,0,0,0);font-size:10.5pt;line-height:1.5">Thanks</span></div><div><span><div style="margin:10px"><font face="verdana" size="2"><span style="color:rgb(0,0,0);background-color:rgba(0,0,0,0)"></span></font></div></span></div>
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