[jboss-jira] [JBoss JIRA] Commented: (JGRP-615) UDP: JGroups always allocates the same ports

[Bela Ban (JIRA)]

    [ http://jira.jboss.com/jira/browse/JGRP-615?page=comments#action_12385552 ] 
            
Bela Ban commented on JGRP-615:
-------------------------------

I chose not to implement the kludge described below. This is overhead, especially on operating systems where it is not used.

According to http://tools.ietf.org/html/draft-larsen-tsvwg-port-randomization-02 (section 2.2), the algorithm for port allocation is:

       next_ephemeral_port = 1024;  /*initialization, could be random */

       /* Ephemeral port selection */
       count = max_ephemeral - min_ephemeral + 1;

       do {
           port = next_ephemeral;
           if (next_ephemeral == max_ephemeral) {
               next_ephemeral = min_ephemeral;
           } else {
               next_ephemeral++;
           }

           if (four-tuple is unique)
               return port;

       } while (count > 0);

       return ERROR;


This should actually always allocate the next available port ! Need to investigate why this is not the case...

> UDP: JGroups always allocates the same ports
> --------------------------------------------
>
>                 Key: JGRP-615
>                 URL: http://jira.jboss.com/jira/browse/JGRP-615
>             Project: JGroups
>          Issue Type: Task
>            Reporter: Bela Ban
>         Assigned To: Bela Ban
>            Priority: Minor
>             Fix For: 2.6, 2.5.2
>
>
> In 2.5 and 2.6, JGroups always allocates the same ports with UDP and no bind_port set. This is different from 2.4, where different (increasing) ports were used.
> Investigate why this is the case, and what changed between 2.4 and 2.5.
> This doesn't happen on Windows and macOS, just on Linux.

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