How SNMP Traps Work In Nagios XI Learn how SNMP traps work in Nagios XI so you can monitor your critical IT infrastructure!         Final Thoughts For any support related questions please visit the Nagios Support Forums at: http://support.nagios... Read More

Overview This KB article explains how to configure Nagios XI to receive SNMP Traps that come in via IPv6 (Internet Protocol version 6). It is a requirement to have already followed this guide to install all the SNMP Trap pre-requisites:... Read More

Overview This KB article explains how to configure Nagios XI to receive SNMP traps from Nagios Network Analyzer (NNA). It is assumed that Nagios XI is already configured to receive SNMP traps, if it is not please follow the steps in this... Read More

Nagios XI - SNMP Trap Hardening This KB article explains how to harden your Nagios XI server to only accept SNMP traps from authorized sources. By default the Nagios XI server will accept inbound SNMP v2 traps from any device. SNMP v3 traps will not... Read More

Nagios XI - SNMP v3 Trap Configuration This KB article explains how to configure your Nagios XI server to accept SNMP v3 traps. By default the Nagios XI server will accept inbound SNMP v2 traps from any device. SNMP v3 traps will not be accepted by... Read More

SNMP Traps With NXTI This document describes how to use the Nagios XI SNMP Trap Interface (NXTI) to monitor and manage incoming SNMP Traps. NXTI was introduced with Nagios XI 5.5 and is enabled with the Enterprise edition license of Nagios XI.... Read More

Problem Description When starting or restarting the snmptt service you see output that looks like the following: Starting snmptt: add_mibdir: strings scanned in from /usr/share/snmp/mibs/.index are too large. count = 49 Cannot find module (SNMPv2-TC... Read More

Problem Description After following the documentation to Integrate SNMP Traps with Nagios XI (https://support.nagios.com/kb/article.php?id=232) there are five EVENTs defined in the /etc/snmp/snmptt.conf file. These five entries have uncommented EXEC... Read More

Firewall Rules These steps explain how to check if the Operating System (OS) of the Nagios server has firewall rules enabled to allow inbound SNMP Trap UDP port 162 traffic. The different supported OS's have different firewall commands which are... Read More

Overview This article shows you several methods of sending a trap to your Nagios server to test SNMP Trap functionality. Sometimes when troubleshooting an SNMP Trap issue, it can be very helpful to remove the actual device that could be causing... Read More

Inbound TCP Traffic These steps explain how to confirm that the Nagios server is receiving SNMP Trap traffic destined for it on the UDP port 162. In this example, the following applies: Remote computer sending SNMP Traps 10.25.5.20 Nagios server... Read More

snmptrapd Service The snmptrapd service is what receives an SNMP Trap from the networking stack and then places it into a spool directory for the snmptt service to process. These steps help confirm that the snmptrapd service is working correctly.... Read More

snmptt Service The snmptt service is what processes traps that have been placed into the spool directory by the snmptrapd service. "Processing Traps" means to look at the spooled trap and determine if it needs to be submitted to Nagios and how.... Read More

Nagios XI and NSTI Nagios SNMP Trap Interface (NSTI) is a stand alone product used for the searchability of trap tables, visualization of traps, and archiving of traps. It does not require a Nagios Core or Nagios XI implementation, it can exist as a... Read More

Overview This KB article explains the differences between the Standard and Embedded handler for processing SNMP Traps. Detailed steps are provided to configure Nagios XI to use either method (the standard handler is the default used). Nagios XI 5.5... Read More

Overview This KB article explains how to identify the SNMP Trap variables that exist in traps and how they are used with SNMPTT. It is assumed that you have already configured Nagios XI to receive SNMP Traps by following this guide: How to Integrate... Read More

Issue: SNMP traps that had previously worked fine are now showing UNKNOWN for the sender IP. Solution: There is a bug (https://sourceforge.net/p/snmptt/bugs/46/) in version 1.4.2 of the snmptt daemon that your server is running which is causing it to... Read More