[jboss-jira] [JBoss JIRA] (AS7-4509) CLONE - Server start without any problem or message even specification of IP address(-s) is ambiguous

[Pavel Janousek (JIRA)]

    [ https://issues.jboss.org/browse/AS7-4509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12685034#comment-12685034 ] 

Pavel Janousek commented on AS7-4509:
-------------------------------------

Richard,

I assume you know everything what follows, but for sure:
- ping6 is implemented in C, his behavior is *different* from how JDK/JVM works in several cases
- there are several things which are different in IPv4 -> IPv6 transition in C and Java world
- several things (especially in IPv4 -> IPv6 transition) JVM and JDK API implementation hides from Java user application code

And for sure - Are you aware ping6 forces his majesty to explicit specify interface +every time+ when you try to ping to IPv6 link-local IP address?
{code}

[pjanouse at pjanouse EAP]$ ping6 fe80::f2de:f1ff:fe41:8826
connect: Invalid argument
[pjanouse at pjanouse EAP]$ ping6 fe80::f2de:f1ff:fe41:8826%1 -c 1
PING fe80::f2de:f1ff:fe41:8826%1(fe80::f2de:f1ff:fe41:8826) 56 data bytes
64 bytes from fe80::f2de:f1ff:fe41:8826: icmp_seq=1 ttl=64 time=0.058 ms

--- fe80::f2de:f1ff:fe41:8826%1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.058/0.058/0.058/0.000 ms
[pjanouse at pjanouse EAP]$ ping6 fe80::f2de:f1ff:fe41:8826 -I em1 -c 1
PING fe80::f2de:f1ff:fe41:8826(fe80::f2de:f1ff:fe41:8826) from fe80::f2de:f1ff:fe41:8826 em1: 56 data bytes
64 bytes from fe80::f2de:f1ff:fe41:8826: icmp_seq=1 ttl=64 time=0.057 ms

--- fe80::f2de:f1ff:fe41:8826 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.057/0.057/0.057/0.000 ms
[pjanouse at pjanouse EAP]$ 
{code}
                
> CLONE - Server start without any problem or message even specification of IP address(-s) is ambiguous
> -----------------------------------------------------------------------------------------------------
>
>                 Key: AS7-4509
>                 URL: https://issues.jboss.org/browse/AS7-4509
>             Project: Application Server 7
>          Issue Type: Bug
>          Components: Domain Management
>    Affects Versions: 7.1.1.Final
>            Reporter: Pavel Janousek
>            Assignee: Brian Stansberry
>              Labels: eap6_ipv6
>             Fix For: 7.1.2.Final-redhat1
>
>
> In IPv6 world it is possible if two or more network interfaces has the same IPv6 address. It is legally and true especially in Link-local address scope.
> So if we configure 2 or more network interfaces with a manually defined IPv6 address (link-local prefix fe80::/10 is the best) and try to start-up EAP and do this like:{code}./standalone.sh -Djava.net.preferIPv4Stack=false -b=fe80::200:ff:fe00:5 -bmanagement=fe80::200:ff:fe00:5 -c standalone-full.xml{code}there isn't *any* warning message reported, nor any notice that this specification is ambiguous.
> I prefer in a such case to reject this specification as ambiguous (especially for the case - there is a risk of accidentally open EAP instance to the world), refuse start with error message and immediately exit. Although this situation has its roots in administrator mistake, it can became very hard risk of customer's data when it will be overseen for awhile. (*)
> (*) some case-studies report blind clear MS Windows station is attacked up to 10 minutes from it boot when is directly connected to unsecure Internet network without any firewall etc... my own personal experience is at least the same... - yes, it is dangerous to work in a such environment and situation on a Internet directly connected server host, but an admins really works like that...
> Anyway - the missed part of specification needed for correct set-up in this case is *zone id* identifier. When it is supplied, star-up is correct.
> Although this is really +edge case+ of using EAP and its configuration, it can accidentally expose customer's sensitive data so we should take it very carefully.

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