Hi, ICMP is not UDP. Which peer should send what message and which peer closes the socket. I am confused...
Best regards, Frank Am 16.02.2013 00:52, schrieb vitz me: > Hello, > Thanks for the reply. I probably used wrong wording here (as I have seen > something like UdpPortUnreachable exception in Java).. But still there should > be an ICMP port unreachable message (type 3, code 3) in case if UDP port is > closed (and not filtered; RFC 792 if I'm not mistaken)...which in turn should > make it possible to process the message and not wait for the timeouts.. > Please, correct me if I'm wrong... > Thanks.. > > > Пятница, 15 февраля 2013, 23:47 +01:00 от Frank Fock <[email protected]>: >> Hi, >> >> It seems that you mix up connection oriented communication (TCP) with >> connection less (UDP). >> With UDP you will never know if a target port is reachable or if the >> application listening on the >> target port is not responding. In both cases you simply wait forever for >> a response (=timeout). >> >> Thus, there is no need to change SNMP4J. >> >> Best regards, >> Frank >> >> >> Am 15.02.2013 16:30, schrieb vitz me: >>> I'm a beginner with Java and SNMP and trying to perform simple get >>> requests. I faced an issue when the connection timeouts seem to still have >>> an effect, even though the port specified for SNMP connection is closed on >>> the target host. >>> Is it possible to somehow process the UdpPortUnreachable (exception) within >>> snmp4j? So that if the port is closed the timeout setting would not have >>> any effect. Or what could be a way for getting around this problem? >>> The only way I could think of was trying to check the port using Java >>> sockets before even trying to send SNMP requests.. >>> Thanks. >>> _______________________________________________ >>> SNMP4J mailing list >>> [email protected] >>> http://lists.agentpp.org/mailman/listinfo/snmp4j >> -- >> --- >> AGENT++ >> Maximilian-Kolbe-Str. 10 >> 73257 Koengen, Germany >> https://agentpp.com >> Phone: +49 7024 8688230 >> Fax: +49 7024 8688231 >> >> _______________________________________________ >> SNMP4J mailing list >> [email protected] >> http://lists.agentpp.org/mailman/listinfo/snmp4j > _______________________________________________ > SNMP4J mailing list > [email protected] > http://lists.agentpp.org/mailman/listinfo/snmp4j -- --- AGENT++ Maximilian-Kolbe-Str. 10 73257 Koengen, Germany https://agentpp.com Phone: +49 7024 8688230 Fax: +49 7024 8688231 _______________________________________________ SNMP4J mailing list [email protected] http://lists.agentpp.org/mailman/listinfo/snmp4j
