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<p class=MsoNormal><span style='font-size:10.0pt;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:10.0pt;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:10.0pt;font-family:"Courier New";
color:blue'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'>Mike Mitchell<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:
"Tahoma","sans-serif";color:windowtext'> mrtg-bounces@lists.oetiker.ch
[mailto:mrtg-bounces@lists.oetiker.ch] <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> mrtg@lists.oetiker.ch<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>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Steve Shipway wrote: <o:p></o:p></p>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><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:5.0pt;margin-bottom:5.0pt'><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
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:5.0pt;margin-bottom:5.0pt'><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:5.0pt;margin-bottom:5.0pt'><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:12.0pt'>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>
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