[jboss-jira] [JBoss JIRA] Created: (JGRP-274) Don't bind to a NIC if bind address is not set

[Bela Ban (JIRA)]

Don't bind to a NIC if bind address is not set
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                 Key: JGRP-274
                 URL: http://jira.jboss.com/jira/browse/JGRP-274
             Project: JGroups
          Issue Type: Feature Request
    Affects Versions: 2.3 SP1, 2.3, 2.2.9 SP3 (2.2.9.3), 2.2.9.2, 2.2.9.1, 2.2.9, 2.2.8, 2.4
            Reporter: Bela Ban
         Assigned To: Bela Ban
             Fix For: 2.5


If -Dbind.address or bind_addr are not set, JGroups picks the NIC to bind sockets to itself. However, especially for ServerSockets, this may not be desirable because we may want to have ServerSockets be able to receive packets through all interfaces, e.g.
- NICs are 192.168.5.2, 192.168.0.2 and 127.0.0.1 (loopback)
- When the bind address is set to 192.168.5.2, a given ServerSocket on port 7500 will *only accept packets from this NIC*
- If someone connects to 192.168.0.2:7500 or 127.0.0.1:7500, the client will not be able to establish a connection because nobody is listening on those ports on the given NICs
- If bind address was not set, this would be possible
- Affected: FD_SOCK, FD_PING, TCP, TCP_NIO etc
- We need to think about semantics for MulticastSockets where a wildcard address (not setting the bind address) means that the operating system picks the NIC, and *not* that the MulticastSocket will listen on all interfaces for incoming packets

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