Sajeev,

My guess is your switch is not configured for multicasting.  This is the
commonly shipped configuration for high end Cisco switches and some
other brands.  I suggest working with your switch vendor to determine
the proper settings, but here is some information you might find useful:

Which brand and model of switch do you have?
http://www.openais.org/doku.php?id=faq:cisco_switches

Another common problem is that your operating system has a firewall
installed.  You could turn this off or enable the proper rules for the
port and udp multicast.

If you determine the exact issue please let us know what it was and the
resolution so we can update our faqs.

Regards
-steve

On Tue, 2008-03-25 at 14:47 -0400, Sajeev Vallat wrote:
> We are observing a problem where the AISEXEC nodes sending data on the
> multicast address is not seen on the wire.  Sniffing on the network
> reveals that ARP requests are send for the multicast address, to which
> none of the machines with AISEXEC nodes  respond.  Is this desired ?
> 
>  
> 
> We also did “strace” on aisexec process, observed that process is
> sending data to multicast address.
> 
>  
> 
> Has anyone seen this behavior before ?
> 
>  
> 
> Thanks
> 
> -Sajeev
> 
> 
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