Paessler PRTG

PRTG receives and
analyzes your SNMP traps

PRTG lets you send, receive and analyze SNMP traps


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    PRTG receives thousands of SNMP traps per second

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    PRTG filters SNMP traps automatically

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    PRTG immediately notifies you in the event of critical situations






What is an SNMP trap?

SNMP traps are one of the oldest standards for network equipment fault notification. Being one of the oldest standard protocols, most network devices with basic management capabilities usually support SNMP traps. When a device detects an error or a change, the device will send a notification to one or more trap receivers.

SNMP traps contain information like:

  • Time, source, and version of event
  • Severity, agent, and event OID (ID of specific event)
  • Event message/description or “Bindings”

Some trap examples are:

  •  Someone activates a network port by plugging in a computer
  • An internet connection goes down on a router
  • Loss of power on an UPS
  • An open case in a server
  • A dead drive in a NAS/SAN or other storage device

Use the following PRTG sensor to start receiving and analyzing SNMP traps

 i How PRTG defines sensors

In PRTG, “sensors” are the basic monitoring elements. One sensor usually monitors one measured value in your network, e.g. the traffic of a switch port, the CPU load of a server, the free space of a disk drive. On average you need about 5-10 sensors per device or one sensor per switch port.

View video (3:26 min.)

How the sensor works:
The PRTG SNMP Trap Receiver Sensor is a passive receiving sensor. It does not actively query data at fixed intervals, but instead collects incoming trap messages. The PRTG server uses this sensor to receive data and – depending on the filter rule – sound the alarm. 


What the sensor displays: The SNMP Trap Receiver Sensor displays the total number of traps received per second, as well as the number of messages that are classified as warnings or errors. It also indicates how many trap packets are lost per second. When using this sensor, you can set your own filter rules.


Inspect traps with the SNMP Trap Receiver Sensor from PRTG


PRTG saves incoming trap messages as regular system files, and neatly displays them in the sensor. The SNMP Trap Receiver Sensor lets you analyze traps and filter them according to date, source, agents, bindings, and more. Be sure to copy the MIB file from the source device and save it in your PRTG program path. PRTG will use this MIB to make your trap messages legible.


How PRTG helps you analyze SNMP traps

 i SNMP stands for Simple Network Monitoring Protocol. Its usefulness in network administration comes from the fact that it allows information to be collected about network-connected devices in a standardized way across a large variety of hardware and software types. SNMP is a protocol for management information transfer in networks, for use in LANs especially, depending on the chosen version.
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Critical system monitoring

Above all else, SNMP trap monitoring is designed for the critical systems that are fundamental to your company. If one of these systems malfunctions, then time is of the essence.

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Immediate notifications

If a critical situation arises, you’ll be notified by PRTG at once – not just when the next scanning interval is scheduled to query your data. PRTG receives the traps, classifies them as errors or warnings, and sounds the alarm.

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Quick troubleshooting

If a device crashes, often it continues to send log messages with information about the crash, including that which may have caused it. By using PRTG as your trap receiver, you’ll see what happened just before the malfunction, and can therefore quickly get to the root of the problem.

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Increased security

Not a single administrator enjoys spending all their time monitoring network components for unwanted intrusions. SNMP trap monitoring uses trap messages to keep you in the know – such as when someone logs into your system during the night even though no one is in the office.

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Easy setup

Thanks to the pre-configured sensor of PRTG, your SNMP trap monitoring will be up and running in no time. Step-by-step instructions facilitate the setup process.


Keep a constant eye on your network – even while on the go

PRTG is set up in a matter of minutes and can be used on a wide variety of mobile devices.


PRTG comes with all the features you need, plus more your IT infrastructure won't want to live without.

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PRTG monitors these vendors and applications, and more, in one view!



Tutorial: 5 easy steps for setting up SNMP trap monitoring

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Step 1: Configure the target device

Configure your target device so it can send SNMP traps. This configuration varies according to the device and its manufacturer (Cisco, HP, Dell, etc.). In general, the IP address and the trap receiver port will be requested.

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Step 2: Add the SNMP Trap Receiver Sensor

In this step, you’ll incorporate the SNMP Trap Receiver Sensor into your PRTG monitoring. Use the “Sensor/Add Sensor” menu option to search for and add the sensor. Be sure to add the sensor to your probe device. By doing so, you’ll receive traps from all the devices that are connected to the probe. If you add the sensor to a specific device, then only the traps of that device will be received.

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Step 3: Configure the sensor

Configure the filter rules in the sensor settings. By default, every trap will be received. The “Exclude” filter lets you exclude certain types of trap messages, e.g. traps from a specific IP address that do not need to be considered. Use the warning and error filters to define those traps which will prompt PRTG to sound the alarm.

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Step 4: Set up the notification system

In “Notifications,” choose whether you’d like to be alerted by email, SMS, push notification, or some other action. You can also opt to be notified when trap messages are received, and have these messages saved so you can analyze the incidents later.

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Step 5: Sit back and relax

Your SNMP trap monitoring is configured and ready to go. You can now get back to your other tasks.


Video: How the SNMP trap monitor PRTG works


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The short and sweet of it: All you need to know about SNMP traps

What is an SNMP trap?

The network protocol SNMP (Simple Network Management Protocol) supplies information on the statuses of individual systems and devices. An SNMP trap is a log-like message that is sent from a device to a “receiver.”   

What does an SNMP trap contain?

SNMP packets consist of a packet header, a PDU header, and a PDU body. For trap messages, the information sent in the PDU header can vary. The PDU header of an SNMP trap packet contains the packet types, the OID of the device, the IP address of the sender, general and company-specific IDs, and the time the trap event occurred. The actual values are sent in the PDU body.

How can I receive SNMP traps?

An SNMP Trap Receiver collects SNMP messages that are sent from network devices to the network management station. Monitored devices send SNMP traps at will to report incidents to the management system. PRTG can handle thousands of SNMP traps per second.

Will I need a trap server?

The term “trap server” is sometimes used synonymously with “trap receiver.” This server receives and processes messages. The SNMP Trap Receiver Sensor lets you configure any PRTG probe device as an SNMP trap server. PRTG supports SNMP v1 traps as defined in RFC 1157, and SNMP v2c traps as outlined in RFC 3416.

Can PRTG analyze and display SNMP traps?

PRTG receives the traps, which include the number of messages received per second, warnings, errors, and lost data packets. PRTG presents trap content and messages in an easy-to-read table. Data can be filtered however you like.


How thoroughly are the SNMP traps analyzed?

With PRTG, you get a quick overview of the traps and their contents, and will be notified immediately in the event of a problem. If you need a more thorough analysis, various specialized tools will allow you to examine traps in detail.


Which port is used for the transmission of SNMP messages?

By default, SNMP traps are sent via UDP port 162. This port must be set as the destination port in your source devices.



What is the difference between Get, GetNext, Set, and Trap?

SNMP works on the assumption that a network management system submits a query, and a managed device returns an answer. There are four possibilities for this exchange: Get, GetNext, Set, and Trap. With Trap, SNMP traps are automatically sent from a device to a compatible receiver – without the receiver requesting them. This is not the case with Get and GetNext. With these commands, queries are performed manually. Set is not a traditional monitoring function.

Does the SNMP trap monitor work with Windows?


PRTG has always been developed for Windows systems, which means you can also set up your trap monitoring in Windows.


We asked: would you recommend PRTG?
Over 95% of our customers say yes!


Paessler AG conducted trials in over 600 IT departments worldwide to tune its network monitoring software closer to the needs of sysadmins.
The result of the survey: over 95% of the participants would recommend PRTG – or already have.


Recommend PRTG


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“We can all work with greater peace of mind knowing
that our systems are constantly being monitored.”

Markus Puke, Network Administrator, Schüchtermann Klinik, Germany


PRTG makes your job easier

Our monitoring software frees you to focus on other tasks by promptly notifying you of potential issues.


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Save effort

PRTG gives you one central monitoring tool for your servers and entire network. Enjoy a quick overview of your whole infrastructure via our dashboard and app.

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Save time

Getting started with PRTG is a breeze. Setting up or switching from another network monitoring tool is easy thanks to the auto-discovery and pre-configured device templates.

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Save money

80% of our customers report substantial cost savings with network monitoring. Your costs of licenses will likely pay for themselves within weeks.



“Easy to implement and configure with good technical support.”

R. v. S., ICT Manager at Heinen & Hopman Eng BV


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3 reader tips from our knowledge base

See our knowledge base for thousands of helpful articles on PRTG. When it comes to SNMP and SNMP traps, we recommend the following:




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TIP: You are still new to SNMP monitoring and need a
little support?

Paessler offers a free, 4-part email course on how to use SNMP for network monitoring which will help you improve your network operations.

Sign up here for our free email coaching and learn to use SNMP in the best way.


Create innovative solutions with Paessler’s IT partners

Partnering with innovative IT vendors, Paessler unleashes synergies to create
new and additional benefits for joined customers.

IP Fabric

Combining the broad monitoring feature set of PRTG with IP Fabric’s automated network assurance creates a new level of network visibility and reliability.

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By integrating PRTG with Martello iQ, you can add a fast analytics layer to improve uptime, visualize your IT environment, and integrate all of your IT systems into a single pane of glass.

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With ScriptRunner, Paessler integrates a powerful event automation platform into PRTG Network Monitor.

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Want to learn more about PRTG? Please do!


PRTG comes with several pre-configured SNMP sensors, some of which have been designed especially for device manufacturers such as Cisco, Dell, and HP. Learn which applications and servers are putting the greatest strain on your network’s bandwidth.

Windows Syslog Monitoring

PRTG provides for efficient and centralized Syslog message management. It collects Syslog messages according to origin and severity, as well as time and IP address. With PRTG, you can seek out weak spots and take action at once. 

 iSyslog stands for System Logging Protocol and is a standard protocol used to send system log or event messages to a specific server, called a syslog server. It is primarily used to collect various device logs from several different machines in a central location for monitoring and review. The protocol is enabled on most network equipment such as routers, switches, firewalls, and even some printers and scanners. In addition, syslog is available on Unix and Linux based systems and many web servers including Apache.
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PRTG is comprehensive network monitoring software. It lets you monitor systems, devices, and applications by working with a variety of different technologies, including SNMP, NetFlow, packet sniffing, and WMI.


PRTG the multi-tool

PRTG: The multi-tool for sysadmins

Adapt PRTG individually and dynamically to your needs and rely on a strong API:

  • HTTP API: Access monitoring data and manipulate monitoring objects via HTTP requests
  • Custom sensors: Create your own PRTG sensors for customized monitoring
  • Custom notifications: Create your own notifications and send action triggers to external systems
  • REST Custom sensor: Monitor almost everything that provides data in XML or JSON format


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More than 500,000 sysadmins love PRTG

Paessler PRTG is used by companies of all sizes. Sysadmins love PRTG because it makes their job a whole lot easier.

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Network Monitoring Software - Version (September 20th, 2023)


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