hadbm createdomain fails, but two split domains are created

Description

If running the HADB management agent on a host with multiple network interfaces, the createdomain command may fail if not all network interfaces are on the same subnet:

hadbm:Error 22020: The management agents could not establish a domain, 
please check that the hosts can communicate with UDP multicast.

By default, the management agents use the “first” interface for UDP multicasts (“first” as returned by java.net.NetworkInterface.getNetworkInterfaces()).

Solution

The best solution is to tell the management agent which subnet to use by setting ma.server.mainternal.interfaces in the configuration file; for example:

ma.server.mainternal.interfaces=10.11.100.0

Alternatively, one may configure the router between the subnets to route multicast packets. By default, the management agent uses multicast address 228.8.8.8.