20.2. Configure JGroups Interfaces

Before JGroups Interface configuration, configure the bind_addr property in the JGroups configuration file to a key word rather than a dotted decimal or symbolic IP address as follows: 
<socket-binding name="jgroups-udp" ...  interface="site-local"/>
Then, configure the JGroups Interface as follows: 
<interfaces>
 <interface name="link-local"><link-local-address/></interface>
 <interface name="site-local"><site-local-address/></interface>
 <interface name="global"><any-address/></interface>
 <interface name="non-loopback"><not><loopback/></not></interface>
</interfaces>
The configuration values used in the example are as follows:
  • link-local: Uses a 169.x.x.x or 254.x.x.x address. This suits the traffic within one box.
  • site-local: Uses a private IP address, for example 192.168.x.x. This prevents extra bandwidth charged from GoGrid, and similar providers.
  • global: Picks a public IP address. This should be avoided for replication traffic.
  • non-loopback: Uses the first address found on an active interface that is not a 127.x.x.x address.
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