<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type">
</head>
<body bgcolor="#ffffff" text="#000000">
Hi Louis,<br>
<br>
We implemented this check specifically to identify network issues. The
subscribers sends 'large' udp packets to the pub on port 8500. Those
packets must arrive in tact. I've seen 3 causes for this so far:<br>
1. the name configured on the publisher does not match the name
configured on the subscriber. Check this very carefully as this is a
prime opportunity for user error and is currently not handled very well<br>
2. the MTU on the publisher is smaller than the MTU on the subscriber.
In this case the large IP packets are delivered to the publisher but
they are discarded by the NIC because they are larger than MTU. from
the cli 'show network eth0 detail':<br>
<br>
Duplicate IP : no<br>
Queue Length : 1000 MTU : 1500<br>
MAC Address : 00:17:a4:aa:d2:05<br>
<br>
3. transit network device such as a firewall that does not support IP
fragments. Because the UDP datagram can be very large (it grows with
the number of servers in the cluster) it may be fragmented at the IP
layer. Transit network devices that attempt any sort of inspection
will have to reassmble the fragments to inspect the payload. This is
frequently performed incorrectly whereby the fragments are simply
dropped, modified, or combined into a single frame that is larger than
the publisher MTU resulting in the same behavior as #2 above.<br>
<br>
/Wes<br>
<br>
<br>
<br>
Louis Koekemoer (ZA) wrote:
<blockquote
cite="mid:1CBD5CFC1E81F640943AC50946F269D51AEF907C1E@ZABRYSVMBX01.af.didata.local"
type="cite">
<meta http-equiv="Content-Type" content="text/html; ">
<meta name="Generator" content="Microsoft Word 12 (filtered medium)">
<style>
<!--
/* Font Definitions */
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:windowtext;}
span.EmailStyle18
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page Section1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.Section1
{page:Section1;}
-->
</style>
<!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
<div class="Section1">
<p class="MsoNormal">I need help on adding a subscriber server to a
cluster. I
did create the subscriber on the Publisher, and after some time
installing
subscriber, at the point of joining to Publisher I get the following
message “<span style="color: rgb(31, 73, 125);">The configuration
validation with ZAMDH06056
(xxx.xxx.xxx.xxx.) failed. The server could not send /receive UDP
packets to
the Publisher on port 8500. Is network connection to ZADMH06056 up? Is
the MTU
size correct for this network? Does the network allow packet
fragments?“ </span>We
can ping this server from the voice VLAN, and I can ping Subscriber IP
from
Publisher, so we don’t think we have network connectivity issues here. <o:p></o:p></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Kind
Regards<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Louis<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<p>This email and all contents are subject to the following
disclaimer:</p>
<p>"<a moz-do-not-send="true"
href="http://www.dimensiondata.com/emaildisclaimer.htm">http://www.dimensiondata.com/emaildisclaimer.htm</a>"</p>
<pre wrap="">
<hr size="4" width="90%">
_______________________________________________
cisco-voip mailing list
<a class="moz-txt-link-abbreviated" href="mailto:cisco-voip@puck.nether.net">cisco-voip@puck.nether.net</a>
<a class="moz-txt-link-freetext" href="https://puck.nether.net/mailman/listinfo/cisco-voip">https://puck.nether.net/mailman/listinfo/cisco-voip</a>
</pre>
</blockquote>
</body>
</html>