Problem with cluster

[alessandro.p]

Hi,
I have a cluster with two machines running for about six month. Now i see that multicast from the two servers has stopped working

root@anakin:~# omping -c 10000 -i 0.001 -F -q yoda anakin
yoda : waiting for response msg
yoda : joined (S,G) = (*, 232.43.211.234), pinging
yoda : given amount of query messages was sent

yoda :   unicast, xmt/rcv/%loss = 10000/10000/0%, min/avg/max/std-dev = 0.094/0.123/1.521/0.024
yoda : multicast, xmt/rcv/%loss = 10000/0/100%, min/avg/max/std-dev = 0.000/0.000/0.000/0.000

root@yoda:~# omping -c 10000 -i 0.001 -F -q yoda anakin
anakin : waiting for response msg
anakin : waiting for response msg
anakin : waiting for response msg
anakin : waiting for response msg
anakin : waiting for response msg
anakin : waiting for response msg
anakin : waiting for response msg
anakin : waiting for response msg
anakin : waiting for response msg
anakin : waiting for response msg
anakin : waiting for response msg
anakin : joined (S,G) = (*, 232.43.211.234), pinging
anakin : waiting for response msg
anakin : server told us to stop

anakin :   unicast, xmt/rcv/%loss = 9120/9120/0%, min/avg/max/std-dev = 0.096/0.150/0.745/0.016
anakin : multicast, xmt/rcv/%loss = 9120/9120/0%, min/avg/max/std-dev = 0.108/0.158/0.750/0.016

I have 0% loss from yoda to anakin and 100% loss from anakin to yoda. They are attacched to the same switch...

Any idea?

 

[manu]

I would suspect here the switch is blocking the multicast traffic. If you have IGMP snooping enabled, either add an IGMP querier or disable IGMP snooping althogether.

 

[alessandro.p]

Hi,
thank you for your reply.
I have a Netgear switch and I followed the multicast note for configuring and in querier page I have

querier admin mode: disable
snooping querier address: 0.0.0.0
igmp version: 2
Query interval: 60
Querier expiry interval: 125

(sorry I cannot post image...)

Is it wrong?

Thank you

 

[manu]

no idea as I am not using this hardware
you can try to disable IGMP snooping and see if that helps ...
have you though about firewall rules too ?

 

[alessandro.p]

ok I try.
I haven't changed nothing in firewall rules