]
Brian Stansberry commented on AS7-3040:
---------------------------------------
FWIW:
1) Starting the AS with -Djava.net.preferIPv4Stack=false but standalone.xml left
unchanged, the server boots and running the CLI app configured to connect to
127.0.0.1:9999 works.
2) Starting the AS with -Djava.net.preferIPv4Stack=false and
-Djava.net.preferIPv6Addresses=true but standalone.xml left unchanged, the server does not
start correctly because the "127.0.0.1" in the standalone.xml interface configs
cannot be resolved. The error message isn't great (which is unrelated to this issue)
but the misconfiguration is detected and reported.
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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