As reported by Rado Husar on JBPAPP-3117:

> Setting an incorrent mcast_addr results in the exception below, which points to stale location:
>
> http://www.jboss.com/wiki/Edit.jsp?page=CrossTalking
>
> [JBoss] 05:57:35,544 WARN [UDP] could not bind to /234.1.78.86 (IPv4 address); make sure your mcast_addr is of the same type as the preferred IP stack (IPv4 or IPv6) by checking the value of the system properties java.net.preferIPv4Stack and java.net.preferIPv6Addresses.
> [JBoss] Will ignore mcast_addr, but this may lead to cross talking (see http://www.jboss.com/wiki/Edit.jsp?page=CrossTalking for details).
> [JBoss] Exception was: java.net.BindException: Cannot assign requested address

I'll change this to the permanent (knock on wood) URL for this page: https://www.jboss.org/community/docs/DOC-9469