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From "Diego Rivera (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (JCS-89) UDP Discovery fails to report correct IP address to peers for back-connect when InetAddress.getLocalHost() fails to return an externally-visible address (i.e. returns a local address)
Date Thu, 26 Jan 2012 05:19:40 GMT
UDP Discovery fails to report correct IP address to peers for back-connect when InetAddress.getLocalHost()
fails to return an externally-visible address (i.e. returns a local address)
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

                 Key: JCS-89
                 URL: https://issues.apache.org/jira/browse/JCS-89
             Project: Commons JCS
          Issue Type: Bug
            Reporter: Diego Rivera


On certain environments where reverse-lookup of the machine's IP address isn't available,
or other IP configurations restrict the ability of the JVM to determine its own "canonical"
local address, it's impossible to determine ahead of time what address should be sent into
the UDP multicast in order for lateral peers to establish the back-connection.

The fix for this is simple: when the packet is received with the discovery message, determine
the source host address of the packet that was received and set that to the discovery message's
host property (setHost(packet.getAddress().getHostAddress()).  This way, it's 100% for certain
we'll be back-connecting to the correct instance.

A patch will be uploaded shortly.

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