[SNMP4J] A question about getTable
Frank Fock
fock at agentpp.com
Thu Aug 14 09:36:38 CEST 2008
Hi Enrique,
You could use AGENT++ for a platform independent
agent and of course SNMP4J-Agent. In both cases,
however, you need to write the instrumentation
code yourself.
Best regards,
Frank
Enrique J. Garcia Diaz wrote:
> Hi Frank,
>
> You are right... It should be a bug of net-snmp agent because I have
> proved with Microsoft snmp agent and it works perfectly. The problem I
> have now is that I should find a platform independent snmp agent because
> my project should run in windows and linux...
>
> Thanks everybody for the replies!!
>
> BR,
> Kike
>
> 2008/8/13 Frank Fock <fock at agentpp.com <mailto:fock at agentpp.com>>
>
> Maybe you need to increase the timeout value
> or check if the agent has a bug regarding
> lexicographic ordering, which is often
> the case in conjunction with the tcpConnTable.
>
> Also the PDU size might impose a problem here.
> But that would be also an agent bug.
>
>
> Best regards,
> Frank
>
> Enrique J. Garcia Diaz wrote:
>
> Hi Frank,
>
> Thank you for your advice. I have tried without a dot at the
> beginning but the result is the same. Anyway, i am going to use
> the standard from now.
>
> Maybe I make a mistake and the problem is not where I am
> thinking... I do not know, do you think that is correct my approach?
>
> Thnks, BR,
> Kike
>
> 2008/8/13 Frank Fock <fock at agentpp.com <mailto:fock at agentpp.com>
> <mailto:fock at agentpp.com <mailto:fock at agentpp.com>>>
>
>
> Hi Kike,
>
> OIDs do not start with a dot! This is some
> stupid notation from NET-SNMP which is
> non-standard. Try "1.3.6.1.2.1.6.13.1.1"
> instead.
>
>
> Best regards,
> Frank
>
> Enrique J. Garcia Diaz wrote:
>
> Hi Frank,
>
> I am going to try to explain better my question...
>
> I have implemented a method that returns a list with the
> rows of
> any table. The method is called getTable and the code is
> below.
>
> public List getTable(String[] oid) {
> try {
> snmp.listen();
> }
> catch (IOException e) {
> e.printStackTrace();
> }
> TableUtils utils = new
> TableUtils(snmp, new
> DefaultPDUFactory());
> OID lowerIndex = null;
> OID upperIndex = null;
> OID[] arr = new OID[oid.length];
> for (int i=0; i<oid.length; i++) arr[i] = new
> OID(oid[i]);
> List list = utils.getTable(target, arr,
> lowerIndex, upperIndex);
> return list;
> }
>
> The input of this method is an array of String that
> represents
> the OIDs. In the case of the table TcpConnTable (from
> RFC1213)
> the array contains the following values:
>
> String [] tcpConnTable = { ".1.3.6.1.2.1.6.13.1.1",
> ".1.3.6.1.2.1.6.13.1.2", ".1.3.6.1.2.1.6.13.1.3",
> ".1.3.6.1.2.1.6.13.1.4", ".1.3.6.1.2.1.6.13.1.5" };
>
> ".1.3.6.1.2.1.6.13.1.1" belongs to tcpConnState,
> ".1.3.6.1.2.1.6.13.1.2" belongs to tcpConnLocalAddress, etc.
>
> The returned value of this method in the case of
> TcpConnTable is
> not valid (is null) and nullPointerException is thrown.
>
> I have found some cases that the method returns valid values.
> For example if I call the method with the following array
> of String:
> String [] hrSWRunTable = { ".1.3.6.1.2.1.25.4.2.1.1",
> ".1.3.6.1.2.1.25.4.2.1.2", ".1.3.6.1.2.1.25.4.2.1.3",
> ".1.3.6.1.2.1.25.4.2.1.4", ".1.3.6.1.2.1.25.4.2.1.5",
> ".1.3.6.1.2.1.25.4.2.1.6", ".1.3.6.1.2.1.25.4.2.1.7" }
>
> where,
> ".1.3.6.1.2.1.25.4.2.1.1" belongs to hrSWRunIndex (from
> HOST_RESOURCES), ".1.3.6.1.2.1.25.4.2.1.2" belongs to
> hrSWRunName, etc.
>
> So, I think that the problem is that I am not able to
> call this
> method with the correct array of String that belongs of
> the list
> of OIDs of the columns in the table. I have found with a MIB
> browser that there is a OIDs like I wrote in my previous mail
> (.1.3.6.1.2.1.6.13.1.1.127.0.0.
> 1.27015.127.0.0.1.1093).
>
> Then, I would like to know if I am doing something wrong
> and how
> people retrieve data from a table like TcpConnTable.
>
> I hope I have explained better with this mail.
>
> Thanks and BR,
> Kike
>
>
> 2008/8/12 Frank Fock <fock at agentpp.com
> <mailto:fock at agentpp.com> <mailto:fock at agentpp.com
> <mailto:fock at agentpp.com>>
> <mailto:fock at agentpp.com <mailto:fock at agentpp.com>
> <mailto:fock at agentpp.com <mailto:fock at agentpp.com>>>>
>
>
>
> Hello Kike,
>
> What exactly is the problem?
>
> Best regards,
> Frank
>
>
> Enrique J. Garcia Diaz wrote:
>
> Hello everybody!
>
> I have tried to look for an answer first to previous
> messages but,
> unfortunately I have not found anything that
> clarify me.
> So, I
> apologize if
> this is not the best place to ask or if someone
> has asked
> before.
>
> My problem is that I want to make a program that
> retrieve
> SNMP
> information.
> In particular, I have some problems retrieving
> information in
> some tables,
> in particular, TcpConnTable (RFC1213).
>
> The problem is that if I use getTable method (in
> org.snmp4j.util.TableUtils), I do not receive the
> data of the
> tables. The
> reason is because some OIDs are something like this:
> .1.3.6.1.2.1.6.13.1.1.127.0.0.1.27015.127.0.0.1.1093,
> where the
> last fields
> are my IP address and the listened port (info that
> it is
> likely
> that I do
> not know)
>
> So, I am not able to retrieve TcpConnTable using
> SNMP4J.
> Anybody
> has any
> suggestions? How can I get these variables?
>
> I have tried to use GetNext and GetBulk methods
> but the
> problem
> is the same,
> I do not know the exact name of the OID that I want to
> retrieve.
> I hope I
> have expressed correctly the problem and everybody
> understand it.
>
> Thanks in advanced,
> Kike
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>
>
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>
>
>
> -- AGENT++
> http://www.agentpp.com
> http://www.mibexplorer.com
> http://www.mibdesigner.com
>
>
>
> --
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>
>
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