SNMP v2

[Guest]

Does cacti use SNMPv2? I seem to be having a problem with 32bit versus 64bit counters...

My graph drops off after 116mbits+.

[Guest]

That's a function of the PHP support for SNMP. If you're interested in v2 and higher support, consider the Perl modules at

http://www.switch.ch/misc/leinen/snmp/perl/

They're quite nice and don't require any of the UCD SNMP software to work. Example scripts are included.

[Guest]

Assuming I have this, what's the quick way to get it to work with cacti?? Just a quick overview would be fine, thanks.

[Guest]

The trick here is to get the data results of whatever you want into .RRD format. Where Cacti really excels is in the simplicity of graphing and presenting RRDTOOL data sources - any .RRD files will work, so you don't necessarily need the data collected within Cacti. Many data "collectors" for RRDTOOL have been created already, especially in the SNMP arena.

If you want to make it easy and have an arsenal of RRDTOOL data collectors, download MRTG from http://www.mrtg.org . It is sort of the precursor to RRDTOOL, but the recent versions of the software allow you save your data results in .RRD format. Just tell MRTG to save the files in the /cacti/rra directory and to add the files as data sources in Cacti, read the Jan 17th post on RRDTOOL data here on the Raxnet board.

Nic

[Guest]

Ok, I did a quick and dirty hack to get this to work if you have SNMPv2 support installed with snmpget...

Here's the diff output:

83c83
< $snmp_octet_name = "ifHCInOctets";
---
> $snmp_octet_name = "ifInOctets";
85c85
< $snmp_octet_name = "ifHCOutOctets";
---
> $snmp_octet_name = "ifOutOctets";
95c95
< $snmp_output_octets = `$path_snmpget -v 2c $snmp_ip $snmp_community ifMIB.ifMIBObjects.ifXTable.ifXEntry.$snmp_octet_name.$snmp_interface_number`;
---
> $snmp_output_octets = `$path_snmpget $snmp_ip $snmp_community interfaces.ifTable.ifEntry.$snmp_octet_name.$snmp_interface_number`;
100c100
< }
---
> }

[DrMosh]

Ok, I finally registered, anyways... that diff above was the modifications to:

cmd_snmp_interface.php

[DrMosh]

One more thing, if you make those mods, you will break compatibility with SNMP v1... I tried to code some intelligence into the script but it wouldn't work... so in that case, you would need two copies of cacti running... one with the v2 mods and one without...

[rix]

Hi!

I have another simple patch, it can be found at http://www.ewn.ee/cacti-snmp2.diff