[SNMP4J] what does protocol family unavailable exception mean

[Frank Fock]

Hi Prathib,

May be the information available from the following site could help too:
http://diario.beerensalat.info/2008/10/12/java_and_ipv6_on_bsd.html

According to them, setting a socket option |IPV6_V6ONLY=0| could help on
dual stack OS to enable shared IPv4/v6 support as it should be supported 
by Java.
The local IP of the transport mapping must be 0.0.0.0 (INADDR_ANY) in 
any case.

Hope this helps.

Best regards,
Frank

Am 28.02.2014 08:48, schrieb Prathib Kumar:
> Hi Frank,
>
> I guess We have also hit upon the similar issue a while back with the 
> mix of IPV4 and IPV6 devices in our system 
> (http://markmail.org/message/dimkbvvewacon7vu) and solution which we 
> went was, bind to both IPV4 and IPV6 ips on the local system separatly 
> and use the separate transport mapping for IPV4 and IPV6 devices
>
> But yesterday, we have seen even that was not helping. I m yet  to 
> root cause the actual failure.
>
> However, if you get any clues on this problem, it would be great.
>
> Regards
> Prathib Kumar.
>
>
>
> On Fri, Feb 28, 2014 at 1:07 PM, Frank Fock <fock at agentpp.com 
> <mailto:fock at agentpp.com>> wrote:
>
>     Hi Syed,
>
>     The exception might be thrown because of mixing IPv4 and IPv6 on
>     the same
>     TransportMapping which is not supported by some operating systems.
>
>     In SNMP4J 2.2.6 the root cause will be included in the
>     MessageException. In SNMP4J 1.x
>     you may enable the debugging log level to get the original stack
>     trace printed to the
>     console.
>
>     Best regards,
>     Frank
>
>
>     Am 25.02.2014 18 <tel:25.02.2014%2018>:23, schrieb Ali, Syed F:
>
>         Hi,
>
>         I'm using snmp4j 1.11.1 in our application and occasionally,
>         we're seeing this exception encountered when trying to send an
>         SNMP get request:
>         org.snmp4j.MessageException: Protocol family unavailable
>                          at
>         org.snmp4j.MessageDispatcherImpl.sendPdu(MessageDispatcherImpl.java:485)[195:org.snmp4j:1.11.1]
>                          at
>         org.snmp4j.util.MultiThreadedMessageDispatcher.sendPdu(MultiThreadedMessageDispatcher.java:146)[195:org.snmp4j:1.11.1]
>                          at
>         org.snmp4j.Snmp.sendMessage(Snmp.java:1082)[195:org.snmp4j:1.11.1]
>                          at
>         org.snmp4j.Snmp.send(Snmp.java:971)[195:org.snmp4j:1.11.1]
>                          at
>         org.snmp4j.Snmp.send(Snmp.java:955)[195:org.snmp4j:1.11.1]
>         ...
>         ... (stack truncated)
>
>         I looked at the snmp4j code for 1.11.1 and it basically
>         catches an IOException and wraps only the message from the
>         exception into the "MessageException" as below:
>         Line 485:      throw new MessageException(iox.getMessage());
>
>
>         1)      Any idea what would cause the IOException to be thrown?
>
>
>         2)      If the code set the IOException as the cause of the
>         MessageException, we could unwind the whole exception cause
>         chain, and find out the root cause of the IOException, like:
>         throw new MessageException( iox );
>
>         Thanks,
>         Syed
>
>         Syed F. Ali
>         CA Technologies
>
>
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