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From "John McCarthy (JIRA)" <>
Subject [jira] Created: (AMQ-2842) Multicast discovery failure due to "alive" heartbeats not received on some multihomed systems
Date Tue, 20 Jul 2010 23:40:51 GMT
Multicast discovery failure due to "alive" heartbeats not received on some multihomed systems

                 Key: AMQ-2842
             Project: ActiveMQ
          Issue Type: Improvement
          Components: Connector
    Affects Versions: 5.3.2
         Environment: Windows 2008, multiple NICs / IP addresses
            Reporter: John McCarthy
            Priority: Minor

Ocassionaly, on some multihomed Windows 2008 systems, brokers cannot be discovered using multicast
discovery.  After investigating, it was determined that the broker "alive" heartbeats were
not being received by the MulticastDiscoveryAgent.  This was traced back to issues with joining
the multicast group using the default network interface.  As Windows socket documentation
bq. It is recommended that a local IPv4 address or interface index always be specified in
the imr_interface member of the ip_mreq  structure, rather than use the default interface.
This is particularly important on computers with multiple network interfaces and multiple
public IPv4 addresses. ([source|])

[AMQ-2381]  was submitted with similar issues for multihomed Windows systems.  It was resolved
by adding network interface parameters that plumbed through to {{MulticastSocket.setNetworkInterface(NetworkInterface)}}
and {{MulticastSocket.setInterface(InetAddress)}}.  However, this set only affects what network
interface the multicast traffic is sent on.  Another parameter is also needed to control what
network interface multicast traffic is received on, plumbed through to {{MulticastSocket.join(SocketAddress,
NetworkInterface)}}.  (The same {{networkInterface}} parameter could be overloaded, but this
could be troublesome for backwards compatibility with the current URI specification.)  

The attached patch is a proposal to add a new {{joinNetworkInterface}} parameter plumbed through
to {{MulticastSocket.join(SocketAddress, NetworkInterface)}}.

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