LMS 3.1 - What application uses the administratively scoped IPv4 multicast

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Nov 4th, 2008
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Hi there,


our Firewall blocked UDP-Requests of CW2000 LMS 3.1 with IP-Address 239.255.2.3 and Port 6155.

With googling I discovered that this IP-Range belongs to "Scoped IPv4 multicasts".

Anybody out there which application inside CW2000 uses multicasts and for what?

As I'm not very familiar with Multicasting can you give me a rough survey?


Thanks in advance


Lothar

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lotmueller Wed, 11/05/2008 - 00:49
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Hi,


with searching I found that ESS-Process uses UDP-Port 6155.

Are there any possiblities to tell ESS not to multicast the traffic on the LAN-Port, or is that just normal behavior?


Why does ESS (Event Service Software) use that multicast feature?


Many thanks


Lothar

Joe Clarke Wed, 11/05/2008 - 10:04
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This is part of the ActiveMQ component of ESS. It can be disabled by editing the NMSROOT/objects/ess/conf/activemq.xml file, and changing the line:




to:




Backup this file before making the change. Restart Daemon Manager after making the change.

andrew.butterworth Sun, 03/15/2009 - 08:28
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What are the consequences of disabling this? What is the reason it is enabled by default?

I am seeing constant Multicast traffic to this destination (239.255.2.3:6155) from my test LMS 3.1 server. I googled it and found some information regarding Active-MQ and multicast discovery but I am not sure why this is enabled by default with LMS 3.1?


The line in the .xml isn't exactly as you describe either:



Andy

Joe Clarke Sun, 03/15/2009 - 10:32
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There is no impact to LMS as we do not make use of the multi-agent sync capabilities of ActiveMQ.


The line you want to change is:


g.meerkoetter Mon, 04/06/2009 - 23:03
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Well, then I'd like to see this change integrated in future releases of LMS.

lo.mueller Mon, 07/27/2009 - 01:11
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Update;


Unfortunately this is not fixed with fresh install of LMS 3.2!!!


Lothar

Joe Clarke Mon, 07/27/2009 - 07:38
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As far as I know, there was no bug or enhancement request made to get this changed, and thus LMS 3.2 will need the same modification to disable the multicast traffic.

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