[jboss-jira] [JBoss JIRA] (AS7-3040) IPv6: IP address proccessing in pure IPv6 (only) network stack environment

[Brian Stansberry (Commented) (JIRA)]

    [ https://issues.jboss.org/browse/AS7-3040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12652099#comment-12652099 ] 

Brian Stansberry commented on AS7-3040:
---------------------------------------

Re: pure IPv6 behavior, from http://docs.oracle.com/javase/6/docs/technotes/guides/net/ipv6_guide/index.html

IPv6 Networking Properties
java.net.preferIPv4Stack (default: false)

If IPv6 is available on the operating system, the underlying native socket will be an IPv6 socket. This allows Java(tm) applications to connect too, and accept connections from, both IPv4 andIPv6 hosts.

If an application has a preference to only use IPv4 sockets, then this property can be set to true. The implication is that the application will not be able to communicate with IPv6 hosts.
java.net.preferIPv6Addresses (default: false)

If IPv6 is available on the operating system, the default preference is to prefer an IPv4-mapped address over an IPv6 address. This is for backward compatibility reasons—for example, applications that depend on access to an IPv4-only service, or applications that depend on the %d.%d.%d.%d representation of an IP address.
This property can be set to try to change the preferences to use IPv6 addresses over IPv4 addresses. This allows applications to be tested and deployed in environments where the application is expected to connect to IPv6 services.
                
> IPv6: IP address proccessing in pure IPv6 (only) network stack environment
> --------------------------------------------------------------------------
>
>                 Key: AS7-3040
>                 URL: https://issues.jboss.org/browse/AS7-3040
>             Project: Application Server 7
>          Issue Type: Bug
>          Components: Server
>    Affects Versions: 7.1.0.Beta1b
>            Reporter: Pavel Janousek
>            Assignee: Jason Greene
>            Priority: Blocker
>         Attachments: IPv6-adresses.png
>
>
> Actual implementation of processing IP address (e.g. from XML cfg) as 127.0.0.1 is +totally+ useless in IPv6 environment (it has its own *incompatible* ekvivalent - _::1_). The default behavior of AS7 is IPv6 disabled at all, so user should be forced to *reconfigure* his instance of AS7 to run it in pure IPv6 network stack only (the are also missing some document described this process yet! - AS7-3039).
> So one issue is when AS7 instance is bring up with default configuration (distributed standalone.xml), but in an IPv6 network environment available only like:
> {code}
> bin/standalone.sh -Djava.net.preferIPv4Stack=false
> {code}
> It uses configured address 127.0.0.1 (default from standalone.xml if key _jboss.bind.address_ isn't defined) as binding point which it could try to use. It is bad and should be avoided, because 127.0.0.1 isn't +valid IPv6 address+, nor allowed IPv6 address format specification (see [RFC 5952|http://tools.ietf.org/html/rfc5952]), and note - IPv4-Compatible IPv6 Address are deprecated (see [RFC 4291 section 2.5.1.1|http://tools.ietf.org/html/rfc4291#section-2.5.5]). Only one possibility is allowed now - IPv4-Mapped IPv6 Address, but it has it's own format and regulary defined address space, also it doesn't make sense to use it in pure IPv6 environment.
> *So conclusion - a such address setting (127.0.0.1) in pure IPv6 environment is miss-configuration error at all and starting AS7 instance in this case should only report valid error message about what happens and end itself, not trying to do with a such address format anything - nor convert to other address format, nor use its own inside logic (convert to ::ffff:<IPv4>) etc..*
> This error relates to other one - produced log contains nonsense messages as:{code}12:59:31,222 INFO  [org.jboss.as.remoting] (MSC service thread 1-2) Listening on localhost.localdomain/127.0.0.1:4447
> {code} even though it is bound and listening only on _::ffff:127.0.0.1:4447_.

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