]
Jason Greene commented on AS7-3040:
-----------------------------------
Pavel, you leave out one of the major reasons for IPv4 mapped addresses, which is that
applications written using IPv4 addresses can communicate with an IPv6 application.
Part of the reason why an IPv4 mapped address shows up printed as a pure IPv4 address is
just that Java converts them internally into a pure IPv4 address.
Also, preferIPv4Stack does not really indicate the user wants pure ipv6 binding.
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
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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