<html>
<head>
<meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<p>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
</p>
<table summary="Note: Configure MTU for VXLAN tunnelling"
style="background: inherit !important; color: rgb(0, 0, 0);
border: 1px solid black; margin-bottom: 20px; border-collapse:
collapse; font-family: Verdana, Geneva, sans-serif; font-size:
12px; font-style: normal; font-variant-ligatures: normal;
font-variant-caps: normal; font-weight: normal; letter-spacing:
normal; orphans: 2; text-align: start; text-indent: 0px;
text-transform: none; white-space: normal; widows: 2;
word-spacing: 0px; -webkit-text-stroke-width: 0px; caret-color:
auto; text-decoration-style: initial; text-decoration-color:
initial;" border="0">
<tbody style="background: inherit !important; color: inherit
!important; border: inherit !important;">
<tr style="background: inherit !important; color: inherit
!important; border: inherit !important;">
<th style="background: gray; color: white; font-weight: bold;
text-align: left; border: inherit !important; padding: 5px;"
align="left">Configure MTU for VXLAN tunnelling</th>
</tr>
<tr style="background: inherit !important; color: inherit
!important; border: inherit !important;">
<td style="font-style: normal; font-variant: normal;
font-weight: normal; font-stretch: normal; font-size: 10pt;
line-height: normal; font-family: Verdana, Geneva,
sans-serif; background: inherit !important; color: inherit
!important; border: 1px solid black; padding: 5px;"
align="left" valign="top">
<p style="font-style: normal; font-variant: normal;
font-weight: normal; font-stretch: normal; font-size:
10pt; line-height: normal; font-family: Verdana, Geneva,
sans-serif; background: inherit !important; color: inherit
!important; border: inherit !important; margin-top: 0px;">Specific
MTU configuration is necessary for VXLAN to function as
expected:</p>
<div class="itemizedlist" style="background: inherit
!important; color: inherit !important; border: inherit
!important;">
<ul class="itemizedlist" style="font-style: normal;
font-variant: normal; font-weight: normal; font-stretch:
normal; font-size: 10pt; line-height: normal;
font-family: Verdana, Geneva, sans-serif; background:
inherit !important; color: inherit !important; border:
inherit !important;" type="disc">
<li class="listitem" style="font-style: normal;
font-variant: normal; font-weight: normal;
font-stretch: normal; font-size: 10pt; line-height:
normal; font-family: Verdana, Geneva, sans-serif;
background: inherit !important; color: inherit
!important; border: inherit !important;">
<p style="font-style: normal; font-variant: normal;
font-weight: normal; font-stretch: normal;
font-size: 10pt; line-height: normal; font-family:
Verdana, Geneva, sans-serif; background: inherit
!important; color: inherit !important; border:
inherit !important; margin-top: 0px;">One option is
to increase the MTU value of the physical interface
and physical switch fabric by at least 50 bytes. For
example, increase the MTU value to 1550. This value
enables an automatic 50-byte MTU difference between
the physical interface (1500) and the VXLAN
interface (automatically 1500-50 = 1450). An MTU
value of 1450 causes issues when virtual machine
taps are configured at an MTU value of 1500.</p>
</li>
<li class="listitem" style="font-style: normal;
font-variant: normal; font-weight: normal;
font-stretch: normal; font-size: 10pt; line-height:
normal; font-family: Verdana, Geneva, sans-serif;
background: inherit !important; color: inherit
!important; border: inherit !important;">
<p style="font-style: normal; font-variant: normal;
font-weight: normal; font-stretch: normal;
font-size: 10pt; line-height: normal; font-family:
Verdana, Geneva, sans-serif; background: inherit
!important; color: inherit !important; border:
inherit !important; margin-top: 0px;">Another option
is to decrease the virtual Ethernet devices' MTU.
Set the<span class="Apple-converted-space"> </span><code
class="option" style="background: inherit
!important; color: inherit !important; border:
inherit !important;">network_device_mtu</code><span
class="Apple-converted-space"> </span>option to
1450 in the<span class="Apple-converted-space"> </span><code
class="filename" style="background: inherit
!important; color: inherit !important; border:
inherit !important;">neutron.conf</code><span
class="Apple-converted-space"> </span>file, and
set all guest virtual machines' MTU to the same
value by using a DHCP option. For information about
how to use this option, see<span
class="Apple-converted-space"> </span><a
class="link"
href="http://docs.openstack.org/admin-guide-cloud/networking_config-agents.html"
target="_top" style="background: inherit
!important; color: inherit !important; border:
inherit !important;">Configure OVS plug-in</a>.</p>
</li>
</ul>
</div>
</td>
</tr>
</tbody>
</table>
<a class="moz-txt-link-freetext" href="https://www.openstack.org/assets/presentation-media/the-notorious-mtu.pdf">https://www.openstack.org/assets/presentation-media/the-notorious-mtu.pdf</a><br>
<br>
如果是vxlan overlay, 很有可能是因为这个。<br>
至于帐号密码报错不知道是什么原因。<br>
<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">On 01/04/2017 07:36 PM, 张博 wrote:<br>
</div>
<blockquote
cite="mid:1a459cd5.598d.1596cb2d525.Coremail.zhangbo_jnu@163.com"
type="cite">
<div
style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial">
<div>大家好：<br>
我司部署的OpenStack+KVM架构的资源池出现了如下问题： （下面的操作都是在同一个网段下进行的。）<br>
在不同物理机下的计算节点创建windos虚拟机（2008和2012都试过）A和B。<br>
（1）A ping B成功，且A telnet B的 3389端口成功。<span
style="color: rgb(255, 0, 0);">但是A无法与B远程桌面，且远程桌面的时输入账号密码后报错。</span><br>
（2）A 能向 B传输几KB的文件，<span style="color: rgb(255, 0, 0);">但是几M的文件或者更大则传输失败，且报错。</span><br>
但是相同物理机下面创建的windows虚拟机A、B，它们之间既能远程桌面也能传输大文件。<br>
且不论是在相同的物理机还是在不同的物理机下面创建centos虚拟机A、B，它们之间也能完成远程登录和大文件的传输。<br>
<br>
请问社区各位学者有无遇到过类似的问题，该如何解决呢？十分感谢！<br>
<br>
<br>
</div>
</div>
<br>
<br>
<span title="neteasefooter">
<p> </p>
</span><br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
Openstack-zh mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Openstack-zh@lists.openstack.org">Openstack-zh@lists.openstack.org</a>
<a class="moz-txt-link-freetext" href="http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-zh">http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-zh</a>
</pre>
</blockquote>
<br>
</body>
</html>