[SNMP4J] Question regarding request id when doing getnext
Frank Fock
fock at agentpp.com
Mon Oct 13 23:04:00 CEST 2014
Hi,
You cannot expect anything from a request ID other than it is unique
as long as the agent is running (and the range of available numbers
is not exhausted).
SNMP4J (currently) also generates an ID for each response which has the
advantage, that even if the response cannot be fully parsed, it cannot
accidentially related to an existing request.
I will check, if I can remove that ID generation safely. Meanwhile
you have two options:
1. Ignore that fact (according to the SNMP standard, it should not be
relevant
in practice).
2. Generate your own request ID and set it in the PDU before providing it
to the Snmp class for sending.
Hope this helps.
Best regards,
Frank
Am 13.10.2014 13:23, schrieb Mátyás Kuti:
> Hello,
>
> We are doing the following:
>
> List<VariableBinding> snmpTable = new ArrayList<VariableBinding>();
> for (TreeEvent event : events) {
> if (event != null) {
> if (event.isError()) {
> logger.info
> <https://mail.internal.ericsson.com/owa/redir.aspx?C=2ipCqKJBBEyRoKqLqlcn5EPTOE5putEI6g7WPUCTE6ZOVwcy2_JaQ_aA843rf0UcX-2b_mw8x5E.&URL=http%3a%2f%2flogger.info>("oid
> [" + oid + "] " + event.getErrorMessage());
> }
> VariableBinding[] varBindings = event.getVariableBindings();
> if (varBindings == null || varBindings.length == 0) {
> continue;
> }
> for (VariableBinding varBinding : varBindings) {
> snmpTable.add(varBinding);
> }
> }
> }
> ...
>
> And we have enforced the GETNEXT behavior by setting:
> mTarget.setVersion(SnmpConstants.version1);
>
> We experience, that the request IDs increase by 2 instead of the expected 1:
>
> Java-log output:
>
> 2014-09-30 15:05:05,888 [DEBUG] Received message from /192.168.210.1/30165
> <https://mail.internal.ericsson.com/owa/redir.aspx?C=2ipCqKJBBEyRoKqLqlcn5EPTOE5putEI6g7WPUCTE6ZOVwcy2_JaQ_aA843rf0UcX-2b_mw8x5E.&URL=http%3a%2f%2f192.168.210.1%2f30165>
> with length 58:
> 30:38:02:01:00:04:05:74:72:61:70:73:a2:2c:02:04:1b:b0:d2:2d:02:01:00:02:01:00:30:1e:30:1c:06:10:2b:06:01:04:01:81:41:81:37:04:01:03:05:01:08:30:04:08:07:de:09:1e:0d:02:27:1e
> 2014-09-30 15:05:05,888 [DEBUG] Looking up pending request with handle
> PduHandle[464572973]
> 2014-09-30 15:05:05,888 [DEBUG] Cancelling pending request with handle
> PduHandle[464572973]
> 2014-09-30 15:05:05,888 [DEBUG] Running pending async request with handle
> PduHandle[464572975] and retry count left 1
> 2014-09-30 15:05:05,888 [DEBUG] Sending message to 192.168.210.1/30165
> <https://mail.internal.ericsson.com/owa/redir.aspx?C=2ipCqKJBBEyRoKqLqlcn5EPTOE5putEI6g7WPUCTE6ZOVwcy2_JaQ_aA843rf0UcX-2b_mw8x5E.&URL=http%3a%2f%2f192.168.210.1%2f30165>
> with length 50:
> 30:30:02:01:00:04:05:74:72:61:70:73:a1:24:02:04:1b:b0:d2:2f:02:01:00:02:01:00:30:16:30:14:06:10:2b:06:01:04:01:81:41:81:37:04:01:03:05:01:08:30:05:00
> 2014-09-30 15:05:05,941 [DEBUG] Received message from /192.168.210.1/30165
> <https://mail.internal.ericsson.com/owa/redir.aspx?C=2ipCqKJBBEyRoKqLqlcn5EPTOE5putEI6g7WPUCTE6ZOVwcy2_JaQ_aA843rf0UcX-2b_mw8x5E.&URL=http%3a%2f%2f192.168.210.1%2f30165>
> with length 58:
> 30:38:02:01:00:04:05:74:72:61:70:73:a2:2c:02:04:1b:b0:d2:2f:02:01:00:02:01:00:30:1e:30:1c:06:10:2b:06:01:04:01:81:41:81:37:04:01:03:05:01:08:31:04:08:07:de:09:1e:0d:02:27:50
> 2014-09-30 15:05:05,941 [DEBUG] Looking up pending request with handle
> PduHandle[464572975]
> 2014-09-30 15:05:05,941 [DEBUG] Cancelling pending request with handle
> PduHandle[464572975]
> 2014-09-30 15:05:05,941 [DEBUG] Running pending async request with handle
> PduHandle[464572977] and retry count left 1
> 2014-09-30 15:05:05,941 [DEBUG] Sending message to 192.168.210.1/30165
> <https://mail.internal.ericsson.com/owa/redir.aspx?C=2ipCqKJBBEyRoKqLqlcn5EPTOE5putEI6g7WPUCTE6ZOVwcy2_JaQ_aA843rf0UcX-2b_mw8x5E.&URL=http%3a%2f%2f192.168.210.1%2f30165>
> with length 50:
> 30:30:02:01:00:04:05:74:72:61:70:73:a1:24:02:04:1b:b0:d2:31:02:01:00:02:01:00:30:16:30:14:06:10:2b:06:01:04:01:81:41:81:37:04:01:03:05:01:08:31:05:00
> 2014-09-30 15:05:05,978 [DEBUG] Received message from /192.168.210.1/30165
> <https://mail.internal.ericsson.com/owa/redir.aspx?C=2ipCqKJBBEyRoKqLqlcn5EPTOE5putEI6g7WPUCTE6ZOVwcy2_JaQ_aA843rf0UcX-2b_mw8x5E.&URL=http%3a%2f%2f192.168.210.1%2f30165>
> with length 58:
> 30:38:02:01:00:04:05:74:72:61:70:73:a2:2c:02:04:1b:b0:d2:31:02:01:00:02:01:00:30:1e:30:1c:06:10:2b:06:01:04:01:81:41:81:37:04:01:03:05:01:08:32:04:08:07:de:09:1e:0d:02:28:1a
> 2014-09-30 15:05:05,978 [DEBUG] Looking up pending request with handle
> PduHandle[464572977]
> 2014-09-30 15:05:05,978 [DEBUG] Cancelling pending request with handle
> PduHandle[464572977]
> 2014-09-30 15:05:05,978 [DEBUG] Running pending async request with handle
> PduHandle[464572979] and retry count left 1
> 2014-09-30 15:05:05,978 [DEBUG] Sending message to 192.168.210.1/30165
> <https://mail.internal.ericsson.com/owa/redir.aspx?C=2ipCqKJBBEyRoKqLqlcn5EPTOE5putEI6g7WPUCTE6ZOVwcy2_JaQ_aA843rf0UcX-2b_mw8x5E.&URL=http%3a%2f%2f192.168.210.1%2f30165>
> with length 50:
> 30:30:02:01:00:04:05:74:72:61:70:73:a1:24:02:04:1b:b0:d2:33:02:01:00:02:01:00:30:16:30:14:06:10:2b:06:01:04:01:81:41:81:37:04:01:03:05:01:08:32:05:00
> 2014-09-30 15:05:06,026 [DEBUG] Received message from /192.168.210.1/30165
> <https://mail.internal.ericsson.com/owa/redir.aspx?C=2ipCqKJBBEyRoKqLqlcn5EPTOE5putEI6g7WPUCTE6ZOVwcy2_JaQ_aA843rf0UcX-2b_mw8x5E.&URL=http%3a%2f%2f192.168.210.1%2f30165>
> with length 58:
> 30:38:02:01:00:04:05:74:72:61:70:73:a2:2c:02:04:1b:b0:d2:33:02:01:00:02:01:00:30:1e:30:1c:06:10:2b:06:01:04:01:81:41:81:37:04:01:03:05:01:08:33:04:08:07:de:09:1e:0d:02:28:3d
> 2014-09-30 15:05:06,026 [DEBUG] Looking up pending request with handle
> PduHandle[464572979]
> 2014-09-30 15:05:06,026 [DEBUG] Cancelling pending request with handle
> PduHandle[464572979]
> 2014-09-30 15:05:06,027 [DEBUG] Running pending async request with handle
> PduHandle[464572981] and retry count left 1
> 2014-09-30 15:05:06,027 [DEBUG] Sending message to 192.168.210.1/30165
> <https://mail.internal.ericsson.com/owa/redir.aspx?C=2ipCqKJBBEyRoKqLqlcn5EPTOE5putEI6g7WPUCTE6ZOVwcy2_JaQ_aA843rf0UcX-2b_mw8x5E.&URL=http%3a%2f%2f192.168.210.1%2f30165>
> with length 50:
> 30:30:02:01:00:04:05:74:72:61:70:73:a1:24:02:04:1b:b0:d2:35:02:01:00:02:01:00:30:16:30:14:06:10:2b:06:01:04:01:81:41:81:37:04:01:03:05:01:08:33:05:00
> 2014-09-30 15:05:06,077 [DEBUG] Received message from /192.168.210.1/30165
> <https://mail.internal.ericsson.com/owa/redir.aspx?C=2ipCqKJBBEyRoKqLqlcn5EPTOE5putEI6g7WPUCTE6ZOVwcy2_JaQ_aA843rf0UcX-2b_mw8x5E.&URL=http%3a%2f%2f192.168.210.1%2f30165>
> with length 50:
> 30:30:02:01:00:04:05:74:72:61:70:73:a2:24:02:04:1b:b0:d2:35:02:01:05:02:01:00:30:16:30:14:06:10:2b:06:01:04:01:81:41:81:37:04:01:03:05:01:08:33:05:00
> 2014-09-30 15:05:06,077 [DEBUG] Looking up pending request with handle
> PduHandle[464572981]
> 2014-09-30 15:05:06,077 [DEBUG] Cancelling pending request with handle
> PduHandle[464572981]
>
> We expect on the agent side that the request IDs increase by 1 just as with
> netsnmp's snmpwalk. This behaviour (the request ID increasing by 2) was
> verified with a TCP dump also.
> What could cause this behaviour? Any idea how to fix it?
>
> Thanks a lot,
> Matyas
> _______________________________________________
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