[jboss-jira] [JBoss JIRA] Commented: (JGRP-956) Binding to mcast address in UDP.java is not working on Linux with IPv6

Binding to mcast address in UDP.java is not working on Linux with IPv6 ---------------------------------------------------------------------- Key: JGRP-956 URL: https://jira.jboss.org/jira/browse/JGRP-956 Project: JGroups Issue Type: Bug Reporter: Richard Achmatowicz Assignee: Bela Ban Priority: Minor Fix For: 2.8 On Linux and Solaris platforms, when setting up the main multicast receiver socket, Bela allows binding the socket to its multicast address, like this: InetAddress group_addr = ... InetAddress bind_addr = ... SocketAddress group_sock_addr = new InetSocketAddress(group_addr, port) ; MulticastSocket s = new MulticastSocket(group_sock_addr) ; // funny s.joinGroup(group_addr) ; Binding to the multicast address on Linux and Solaris was done in order to avoid the promiscuous traffic problem. A detailed discussion on the matter can be found in the bugzilla report:https://bugzilla.redhat.com/show_bug.cgi?id=231899. This works on Linux with IPv4 but is not working on Linux with IPv6 for the multicast-address ff02::1 - an error message is being generated (SocketException, invalid argument) and the code then tries to create the same multicast address in the usual way: InetAddress group_addr = ... InetAddress bind_addr = ... MulticastSocket s = new MulticastSocket(port) ; s.setInterface(bind_addr) ; s.joinGroup(group_addr) ; This is only a problem in that it generates a confusing error message about using mixed IPv4 / IPv6 stacks, but the socket continues to work correctly as far as I can tell. Haven't confirmed this, but I believe the promiscuous traffic issue does not arise with IPv6 multicast sockets.