Resolution:
Resolution:
===========
The error indicates that the interface is not multicast enabled. The error is seen when using virtual IP addresses (VIPA).  IBM's TCP/IP implementation automatically configures interfaces ability to do multicast but it does not allow a VIPA interface to support multicasting even though the underlying physical interfaces do.

The output of "netstat (or onetstat) -d" will tell if the VIPA interface being used is multicast capabable or not.  RV sets the socket to multicast automatically, which results in  the error.

The error message is for informational purposes only - the RVD is up and available for TCP/IP broadcast type processing.  This is not a fatal error, RVD is still functional and you should not experience any problems using it.  Even in broadcast mode, we set certain multicast items.  If you are doing broadcast only this error can be ignored. If you intend to do multicast in your applications you will have to specify a non-VIPA interface.

Environment:
==========
OS/400

TIBRV/RVD: failed: setsockopt(IP_ADD_MEMBERSHIP): 3421 (Address not available.)