Hi Dave,
This is part of my MIB output using snmptranslate
MyTables
|-------- Table1
|-------- Table1Entry
| |------- Index: RowIndex
| |
| |---------------- Iteger32 RowIndex
| |------ CR String AlarmDateTime
| |------ CR String AlarmType
| |------ CR String
AlarmDescription
Table2
|-------- Table2Entry
|-------- Index: RowIndex
|
|---------------- Integer32 RowIndex
|------ RW String IPAddress
|------ RW Integer32 PortNumber
|------ RW Integer32 Enabled
I have 3 modules;
agent.c agent.h
table.c table.h
conf.c conf.h
agent.c implements all the scalars oid on my mib, also, it implements the
Table1 handler using net-snmp helper handler. The initialization is called
initialize_alarm_helper();
table.c contains my custom handlers for Table1. If I include this module, I
disable the net-snmp helper handler above (initialize_alarm_helper());
conf.c contains my custom handlers for Table2.
Table1 has 2 rows, RowIndex=1 to 2
Table2 has 4 rows, RowIndex=0 ~ 3
With snmpd compiled with agent, table, conf modules (no net-snmp helper handler)
snmpwalk –v1 –cprivate localhost IPAddress // works OK
snmpwalk –v1 –cprivate localhost PortNumber // works OK
snmpwalk –v1 –cprivate localhost Enabled // works OK
snmpwalk –v1 –cprivate localhost AlarmDateTime // works OK
snmpwalk –v1 –cprivate localhost AlarmType // works OK
snmpwalk –v1 –cprivate localhost AlarmDescription // hangs @ AlarmDescription.2
I used snmpd –Dagent, table, conf –d
And snmpd.log reveals that
snmpwalk-v1 –cprivate localhost AlarmDescription
issue getnext and conf.c MODE_GET handler is called. So you are right, the
problem is in Table2.
I removed table.c module, and compile snmpd with agent.c (using net-snmp helper
handler) and conf.c. and I get the same results.
I further remove conf.c module and compile only with snmpd with agent.c (using
net-snmp helper handler) only. The problem is gone, snmpd does not hangs on
AlarmDescription.2
This is what I got with snmpd (--with-mib-modules=”agent”) when invoking
snmpgetnext
snmpgetnext –v1 –cprivate localhost AlarmDescription.2
UCD-SNMP-MIB::memIndex.0 = INTEGER: 0
Of course, this is with the net-snmp helper, I will try with my own module
(snmpd –agent.c table.c) and see if there’s any errors.
Leo;
--- On Tue, 10/19/10, Dave Shield <d.t.shi...@liverpool.ac.uk> wrote:
From: Dave Shield <d.t.shi...@liverpool.ac.uk>
Subject: Re: Understanding snmpwalk
To: "Leo Lin" <hayashi_...@yahoo.com>
Cc: "Net-snmp-users" <net-snmp-users@lists.sourceforge.net>
Date: Tuesday, October 19, 2010, 5:29 AM
On 19 October 2010 13:20, Leo Lin <hayashi_...@yahoo.com> wrote:
> Actually I have 2 tables, and on both it behaves differently.
What are the root OIDs of each table?
What other objects are defined between the two?
> On both tables, if I perform snmpgetnext, it works fine.
That's a bit vague.
What OIDs are you running "snmpgetnext" on?
Remember, I suggested you ran snmpgetnext on the *last*
instance of the table. I.e. the final value returned by snmpwalk
before it hangs.
> I'm going to try to revert table 1 using the netsnmp helper handler
> instead, to check if this happens with the helper as well.
My suspicion is actually with table2, not table1.
But you haven't given enough detail to confirm this.
Dave
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