[jboss-jira] [JBoss JIRA] (AS7-5359) CLONE - Config XML with <interface ...><any-ipv4-address /></interface> + -Djava.net.preferIPv4Stack=false produces binding to ANY address (error)

[Brian Stansberry (JIRA)]

    [ https://issues.jboss.org/browse/AS7-5359?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12717623#comment-12717623 ] 

Brian Stansberry commented on AS7-5359:
---------------------------------------

AFAICT in the absence of -Djava.net.preferIPv4Stack=true there is no way to tell the VM to bind a socket to all IPv4 addresses, but only to IPv4 addresses.

So, all we can is check when we see this <any-ipv4-address/> and fail if we don't see -Djava.net.preferIPv4Stack=true.

But, testing on Windows shows that this problem doesn't exist there, which makes my proposed fix problematic; i.e. rejecting <any-ipv4-address/> without a corresponding -Djava.net.preferIPv4Stack=true would break things on Windows.

The <any-ipv4-address/> and <any-ipv6-address/> config elements basically don't have any value, since in the end the behavior we'll support will be what <any-address/> plus the -Djava.net.preferIPv4Stack specifies. So those elements will likely be removed in AS 8.
                
> CLONE - Config XML with <interface ...><any-ipv4-address /></interface> + -Djava.net.preferIPv4Stack=false produces binding to ANY address (error)
> --------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: AS7-5359
>                 URL: https://issues.jboss.org/browse/AS7-5359
>             Project: Application Server 7
>          Issue Type: Bug
>          Components: Domain Management
>    Affects Versions: 7.1.2.Final (EAP)
>            Reporter: Pavel Janousek
>            Assignee: Brian Stansberry
>             Fix For: 7.2.0.Alpha1
>
>
> The same situation is with every shipped and supported configuration/profile. As base for my explanation I'm using standalone.xml. Standalone.xml declares xmlns as:
> {code}
> <server xmlns="urn:jboss:domain:1.3">
> {code}
> The real XSD file which defined elements is jboss-eap-6.0/docs/schema/jboss-as-config_1_3.xsd.
> The very common Linux system has implemented and enabled dualstack in these days. If we instruct AS instance to bind to +any+ IPv4 address via {code}<interface name="public">
>     <any-ipv4-address />
> </interface>{code}
> The real result is to bind running AS instance to +any+ IP address, not only in IPv4 address space but in IPv6 too!
> With default setting (= -Djava.net.preferIPv4Stack=true), result is correct - it is bound to ANY IPv4 addresses only.

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