[jboss-jira] [JBoss JIRA] Commented: (JGRP-1268) Allow 0.0.0.0 as bind address

[Bela Ban (JIRA)]

    [ https://issues.jboss.org/browse/JGRP-1268?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12573380#comment-12573380 ] 

Bela Ban commented on JGRP-1268:
--------------------------------

[comment by Jayesh Seshadri]

What would be the address visible to other entities (i.e. where would
they send their packets to)?
Note that currently if you use the external address 'override' for
that, jgroups resolves the external_addr property using
InetAddress.getByName on the node that the external_addr was assigned
to, prior to advertising that address to the peers.

A simple fix would be to skip that resolution on the node that the
external_addr is assigned and simply advertise the supplied
external_addr string as-is to the other nodes, requiring that to be
resolvable from the other nodes. So if I set external_addr =
'foobar.corp.com', peers would get the peer address as
"foobar.corp.com", and attempt to send packets to "foobar.corp.com",
instead of the single IP returned by InetAddress.getByName().


> Allow 0.0.0.0 as bind address
> -----------------------------
>
>                 Key: JGRP-1268
>                 URL: https://issues.jboss.org/browse/JGRP-1268
>             Project: JGroups
>          Issue Type: Feature Request
>            Reporter: Bela Ban
>            Assignee: Bela Ban
>             Fix For: 2.12
>
>
> Currently, bind_addr has to be a valid interface and the wildcard (0.0.0.0) address is not permitted. The reason is that bind_addr determines the physical address of a node, e.g. 192.168.1.5:46537, and using 0.0.0.0:46537 wouldn't allow us to identify the node in order to send it a message.
> To allow for TCP and UDP sockets to bind to the wildcard address, we could either use a bind_addr of 0.0.0.0 and introduce an additional property to pick the physical address (e.g. physical_addr="192.168.1.5" / physical_addr="GLOBAL"), or continue using bind_addr to determine the physical address and add a property (bind_to_wild_card_addr="true") to make the UDP and TCP sockets bind to the wildcard address (if true).

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