Here is my dilemma. Suddenly, as of yesterday, multicast packets are no longer being received from eth1 (private gigabit network) from one node. Routing between all the nodes is fine, no collisions, packet loss, etc.
ifconfig info, inet addr, Bcast, Mask, are all fine - they all share the same bcast and netmask. Also, they all share: UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 on eth1 .
These nodes are all hosted by a Xen VM provider. All the guests are seeing each others private IP addresses. There are no
iptables rules involved. Multicast packets can be seen between all the nodes (20+) except one - using
tcpdump. The system was restarted, etc.
just to add, the affected node, according to netstat -g is not being assigned the multicast group, "eth1 1 188.8.131.52" as all the others.
What would cause something like this? It seems that one node is no longer part of the multicast group - I have a ticket opened but I have a feeling they are stumped.