On Wed, Sep 10, 2008 at 03:36:50PM -0400, Lieting Yu wrote:
> 
>    I can dump out the XML data from 'telnet host_b 8649', and it seems the
>    data has not been updated for the past 4 hours. But tcpdump on 'host_b'
>    does see all network traffic going to the multicast address.

your gmond has become deaf, restarting it should fix it

>    Any thoughts on how to troubleshoot this issue?

look in the system logs for gmond having problems sending to the multicast
channel, and confirm your interface is still bound to that multicast address
in the interface that gmond is attached to with something like :

 # ip maddr show
 # netstat -anp | grep gmond

doing an strace to gmond to try to guess what it is doing could help too in
helping fixing the bug that make it deaf, but it is most likely because of
network reconfiguration after gmond started as documented already in BUG38

  http://bugzilla.ganglia.info/cgi-bin/bugzilla/show_bug.cgi?id=38

Carlo

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