[mrtg] Final: FreeBSD Ports: MRTG + Nagios + Net-SNMP + p5-*
Mike.Mitchell at sas.com
Tue Apr 10 00:22:10 CEST 2007
SNMP_util.pm is a wrapper for SNMP_Session.pm. SNMP_util.pm will restrict source queries to a specific VIP, however it does not know about ".snmp-dis/snmp.conf".
Here is a part of the README.SNMP_util file shipped with SNMP_util.pm:
The port parameter was recently augmented to allow the specification of
the IP address (or hostname) and port of the machine doing the query in
addition to the IP address (or hostname) and port of the machine being
queried. Some machines have additional security features that only allow
SNMP queries to come from certain IP addresses. If the host doing the
query has multiple interface, it may be necessary to specify the interface
the query should come from. The port parameter is further broken down
into "remote_port!local_address!local_port". Here are some examples:
somehost:161!192.168.2.4!4000 use 192.168.2.4 and port 4000 as source
somehost:!192.168.2.4 use 192.168.2.4 as source
somehost:!!4000 use port 4000 as source
Most people will only need to use the first form ("somehost").
In the previous text "recently" is sometime before 2001.
Over a year ago, in January of 2006, MRTG version 2.13.0 was released. That version was the first version of MRTG to include support for SNMPv3. The support for SNMPv3 is derived from Net::SNMP, using another wrapper (Net_SNMP_util.pm). Net_SNMP_util.pm has the same API as SNMP_util.pm. Since it calls Net::SNMP->session directly, if Net::SNMP supports the ".snmp-dis/snmp.conf" file, then Net_SNMP_util.pm supports the ".snmp-dis/snmp.conf" file.
I do not see any reference to a "snmp.conf" file in the documentation for Net::SNMP, http://search.cpan.org/~dtown/Net-SNMP-5.2.0/lib/Net/SNMP.pm Maybe you're confusing the Net-SNMP (http://www.net-snmp.org) suite of applications with the CPAN perl module "Net::SNMP".
SAS Institute Inc.
Mike.Mitchell at sas.com
From: mrtg-bounces at lists.oetiker.ch [mailto:mrtg-bounces at lists.oetiker.ch] On Behalf Of Brian A. Seklecki
Sent: Monday, April 09, 2007 5:32 PM
To: mrtg at lists.oetiker.ch
Subject: [mrtg] Final: FreeBSD Ports: MRTG + Nagios + Net-SNMP + p5-*
Regarding original bug report in 2006:
"I can't tell the MRTG to source queries form a specific VIP on the
utility box by setting:
# more .snmp-dis/snmp.conf
The PERL POD SNMP_Util doesn't seem to honor these the way the Net-SNMP
CLI/lib/p5-Net-SNMP does, thus I can't create system-service abstraction.
Plus, it complicates firewall rules!"
Conclusion: For the record, MRTG does not and can not use Net::SNMP, it
uses SNMP::Util and SNMP::Session instead.
If one needs a network resource graphing solution and system-service
abstraction is a priority (HA/Load Balance), then consider a system that
uses the Net-SNMP libraries.
-lava (Brian A. Seklecki - Pittsburgh, PA, USA)
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