[mrtg] Works sometimes

[Bart Vandyck]

Hi All,

I've just installed a Netscreen 5 FW and now I'm trying to monitor it with
mrtg. I create an SNMP community Admin. I've installed Getif2 and i can walk
the MIB's and request data without any errors....

Next I ran cfgmaker Admin at 192.168.123.1 and no problems the script got
created. I just changed the workdir manually. I Started up the script and i
ran fine. It created the HTML & png files. Ran the script a couple more
times and even say the data. Everything for now I run the updates from a
looping batch file.
The problem: After about 10 good runs it stops working and generates the
following errors:

2002-07-24 19:26:29 -- SNMP Error:
no response received
SNMPv1_Session (remote host: "192.168.123.1" [192.168.123.1].161)
                  community: "Admin"
                 request ID: -58132192
                PDU bufsize: 8000 bytes
                    timeout: 20s
                    retries: 5
                    backoff: 1)
2002-07-24 19:26:29 -- SNMPGET Problem for ifInOctets.2 ifOutOctets.2
sysUptime sysName on Admin at 192.168.123.1::20:5::
2002-07-24 19:26:29 -- WARNING: skipping because at least the query for
ifInOctets.2 on  192.168.123.1 did not succeed
2002-07-24 19:26:29 -- ERROR: Target[192.168.123.1_1][_IN_] '
$$target[0]{$mode} ' did not eval into defined data
2002-07-24 19:26:29 -- ERROR: Target[192.168.123.1_1][_OUT_] '
$$target[0]{$mode} ' did not eval into defined data
2002-07-24 19:26:29 -- WARNING: Skipping Update of 192.168.123.1_1, inlast
is not defined
2002-07-24 19:26:29 -- WARNING: Skipping Update of 192.168.123.1_1, outlast
is not defined
2002-07-24 19:26:29 -- ERROR: Target[192.168.123.1_2][_IN_] '
$$target[1]{$mode} ' did not eval into defined data
2002-07-24 19:26:29 -- ERROR: Target[192.168.123.1_2][_OUT_] '
$$target[1]{$mode} ' did not eval into defined data
2002-07-24 19:26:29 -- WARNING: Skipping Update of 192.168.123.1_2, inlast
is not defined
2002-07-24 19:26:29 -- WARNING: Skipping Update of 192.168.123.1_2, outlast
is not defined
2002-07-24 19:31:30 -- Started mrtg
2002-07-24 19:36:30 -- Started mrtg
2002-07-24 19:41:31 -- Started mrtg

As you can see after the errors I again get 3 good runs.... So I got script
that works half of time.

What I tried so far (including 20 recreations of the script)
	- Ran SNMPTrafficGrapher to see if it was a problem with the FW Device (at
the moment mrtg gave errors)
	- ran Getif2 at same moment the errors occured --> no problems
	- snmputil no problem
	--> conclusion: no problem with SNMP on the FW

	- Downgraded MRTG 2.9.21 to 2.9.18 (just to check)
	- Increased the timeout values (to 20 seconds)
	  my string now looks like this
	  -->Target[192.168.123.1_1]: 1:Admin at 192.168.123.1::20:5::

The moments it doesn't function appear to be completly random. After 5 days
I'm ready give up.

Does mrtg (or activeperl) usses windows scripting engine? I've got version
5.1  en now I'm suspecting everything...

Someone got an idea??

rgds

Bart

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