LMS 3.1 - What application uses the administratively scoped IPv4 multicast

lotmueller · ‎11-04-2008

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

lotmueller · ‎11-05-2008

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 · ‎11-05-2008

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 · ‎03-15-2009

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 · ‎03-15-2009

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 · ‎04-06-2009

Well, then I'd like to see this change integrated in future releases of LMS.

lo.mueller · ‎07-27-2009

Update;

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

Lothar

Joe Clarke · ‎07-27-2009

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.