Specifies the IP address of the interface to be used for sending multicast packets, and the multicast group address to be used.
The format is as follows:
interface; multicast group address
The value for
interface is unique to a node. It must also be the same in both the discovery and the listen URLs for a node. If there are multiple interfaces on one machine, specify the interface you want to use and do not rely on the default value.
The value for
multicast group address must be the same on all machines in the cluster.
The default value for
interface is the first available interface provided by the operating system hosts file for the machine.
Note: If the desired interface is not listed in the hosts file then PGM picks the first available interface in the file. (On most operating systems, this file is called the /etc/hosts file.) If the first interface is the loopback interface (127.0.0.1) then PGM fails to start. In this case you would see a stacktrace exception in the log file such as the following:
SYS_ERROR (multicast_error - (8) grp_iface not a valid multicast interface)
To resolve this issue, either modify the hosts file, or provide the desired interface explicitly in the
network argument.
The default value for
multicast group address is the multicast group address
239.8.8.9.
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