This page: http://net-snmp.sourceforge.net/docs/man/snmpd.conf.html#lbAZ
describes how the snmp agent can be extended with a simple script.
Here is a very bad example of a script that I saved in the file
/usr/local/bin/snmp_extender.py ...
#! /usr/bin/python -u
import sys
# OID is passed with a -g command line switch
OID = sys.argv[2].strip()
if OID == ".1.3.6.1.3.55":
print OID + ".0"
print "counter"
print 1234
The snmp agent will run the script whenever anything in the .1.3.6.1.3.55
subtree is fetched.
To tell the SNMP agent to run the script and to allow users to read that part
of the MIB tree I added the following lines in snmpd.conf...
#
# "Pass-through" MIB extension command
#
pass .1.3.6.1.3.55 /usr/local/bin/snmp_extender.py
and
###############################################################################
#
# ACCESS CONTROL
#
# system + hrSystem groups
only
view systemonly included .1.3.6.1.3.55
I tested my script by running it manually to simulate what the snmp agent will
do when it gets a request...
alanr@pug:~$ /usr/local/bin/snmp_extender.py -g .1.3.6.1.3.55
.1.3.6.1.3.55.0
counter
1234
And then I restarted the snmp agent and tried it with snmpwalk...
alanr@pug:~$ snmpwalk -v 1 -O n -c public localhost .1.3.6.1.3.55
.1.3.6.1.3.55.0 = Counter32: 1234
End of MIB
And again without expressing the result numerically:
alanr@pug:~$ snmpwalk -v 1 -c public localhost .1.3.6.1.3.55
SNMPv2-SMI::experimental.55.0 = Counter32: 1234
End of MIB
Obviously the script is no good for anything other than an example. I hope it
helps, I'm not sure you're going in the right direction though.
Good luck
Alan
From: M.AMJAD [mailto:amji...@yahoo.com]
Sent: Thursday, May 08, 2014 11:55 PM
To: Net-snmp-users@lists.sourceforge.net
Subject: Experimenta OIDs usage
Hi,
i am trying to use experimental , but how to use (add) a personal OID or
another one, please.....
for example i want to use 1.3.6.1.3.55 , so how to add & use 55 accessible,
output is as follows,
[root@localhost amjid]# snmpwalk -v 1 -c public localhost 1.3.6.1.3
End of MIB
[root@localhost amjid]# snmpget -v 1 -c public localhost 1.3.6.1.3.55
Error in packet
Reason: (noSuchName) There is no such variable name in this MIB.
Failed object: SNMPv2-SMI::experimental
M.AMJAD
+92-345-9208119
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