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Mike Mitchell wrote:
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<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Courier New"; color: blue;">As
the author of SNMP_util.pm I strongly disagree that the problem
lies with the SNMP_util module.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Courier New"; color: blue;">The
SNMP_util.pm module does not do any SNMP queries on its own,
rather it calls Simon Leinen’s SNMP_Session module to do all socket
I/O.
In private email I suggested Brandon Miller use 16-bit SNMP request IDs
(--use-16bit
on cfgmaker) and to enable ‘avoid_negative_request_ids’, but he did
not respond.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Courier New"; color: blue;"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Courier New"; color: blue;">Mike
Mitchell<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Courier New"; color: blue;"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Courier New"; color: blue;"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Courier New"; color: blue;"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif"; color: windowtext;">From:</span></b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif"; color: windowtext;">
<a class="moz-txt-link-abbreviated" href="mailto:mrtg-bounces@lists.oetiker.ch">mrtg-bounces@lists.oetiker.ch</a>
[<a class="moz-txt-link-freetext" href="mailto:mrtg-bounces@lists.oetiker.ch">mailto:mrtg-bounces@lists.oetiker.ch</a>] <b>On Behalf Of </b>Brandon
Miller<br>
<b>Sent:</b> Friday, January 22, 2010 10:32 AM<br>
<b>To:</b> Steve Shipway<br>
<b>Cc:</b> <a class="moz-txt-link-abbreviated" href="mailto:mrtg@lists.oetiker.ch">mrtg@lists.oetiker.ch</a><br>
<b>Subject:</b> Re: [mrtg] SNMPWALK Problem for 1.3.6.1.2.1.1 on
cross-compiled
mrtg (openwrt mipsbe)<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Steve Shipway wrote: <o:p></o:p></p>
<blockquote style="margin-top: 5pt; margin-bottom: 5pt;">
<pre>I'm attempting to cross-compile mrtg for openwrt on a mipsbe processor.<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
</blockquote>
<pre>...<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<blockquote style="margin-top: 5pt; margin-bottom: 5pt;">
<pre>SNMPv1_Session (remote host: "10.255.255.253" [10.255.255.253].161)<o:p></o:p></pre>
<pre>community: "public"<o:p></o:p></pre>
<pre>request ID: -552632565<o:p></o:p></pre>
<pre>PDU bufsize: 8000 bytes<o:p></o:p></pre>
<pre>timeout: 2s<o:p></o:p></pre>
<pre>retries: 5<o:p></o:p></pre>
<pre>backoff: 1)<o:p></o:p></pre>
<pre>at /usr/share/mrtg/bin/../lib/mrtg2/SNMP_util.pm line 631<o:p></o:p></pre>
<pre>SNMPWALK Problem for 1.3.6.1.2.1.1 on <a moz-do-not-send="true"
href="mailto:public@10.255.255.253:::::1:v4only">public@10.255.255.253:::::1:v4only</a><o:p></o:p></pre>
<pre>at ./cfgmaker line 950<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
</blockquote>
<pre>...<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<blockquote style="margin-top: 5pt; margin-bottom: 5pt;">
<pre>root@OpenWrt:/usr/share/mrtg/lib/mrtg2# snmpwalk -c public -v 1<o:p></o:p></pre>
<pre>10.255.255.253 1.3.6.1.2.1.1<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
</blockquote>
<pre>...<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<blockquote style="margin-top: 5pt; margin-bottom: 5pt;">
<pre>iso.3.6.1.2.1.1.1.0 = STRING: "router"<o:p></o:p></pre>
<pre>iso.3.6.1.2.1.1.2.0 = OID: iso.3.6.1.4.1.14988.1<o:p></o:p></pre>
<pre>iso.3.6.1.2.1.1.3.0 = Timeticks: (46821500) 5 days, 10:03:35.00<o:p></o:p></pre>
<pre>iso.3.6.1.2.1.1.4.0 = STRING: "test-box"<o:p></o:p></pre>
<pre>iso.3.6.1.2.1.1.5.0 = STRING: "wrtName"<o:p></o:p></pre>
<pre>iso.3.6.1.2.1.1.6.0 = STRING: "here"<o:p></o:p></pre>
<pre>iso.3.6.1.2.1.1.7.0 = INTEGER: 78<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
</blockquote>
<pre><o:p> </o:p></pre>
<pre>Sounds as if the problem lies in the SNMP_util module, which is part of the MRTG installation. I have no familiarity with your OS but it may be that this module is making some assumptions about SNMP - maybe there are permissions issues on who can listen the UDP responses, for example.<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Since snmpwalk works we know the issue is not the agent, but snmpwalk uses different code to SNMP_util.pm.<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>I'd suggest you direct your investigations to this module, maybe make a small Perl script to use it to make a single SNMP lookup and see if that works?<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Steve<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre> <o:p></o:p></pre>
<p class="MsoNormal" style="margin-bottom: 12pt;">Thanks for the
responses.
I took the easy way out and decided to use a different monitoring
tool.
Found that rrd was a pre-compiled package for my openwrt install. Gave
that a try and got it working.<br>
<br>
Unfortunately, this project is short-fused and I don't have much time
to
troubleshoot the mrtg install...even though I got this far :) I agree,
the problem was probably in SNMP_util.pm. I didn't get too far in
examining that or the packet dumps that I captured. I'm also wondering
if
running the perl code on a big endian machine vs a little endian
machine made a
difference?<br>
<br>
Thanks again<br>
Brandon<br>
<br>
<br>
<br>
<o:p></o:p></p>
</div>
</blockquote>
I stand corrected. I was debugging late at night. Looking over the
debugging that I managed to do, it seemed to be stuck in
SNMP_Session.pm and not in SNMP_util.pm. Also, while I was just in
there looking at it, I tried cfgmaker again with the fix Mike
suggested. I changed avoid_negative_request_ids as suggested, but
didn't seem to help. Thanks for the suggestion though. I have a
feeling that SNMP_Session or something that it uses is doing something
weird with integers that is different on a big-endian machine....<br>
<br>
Brandon<br>
<br>
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