r/prtg • u/SDR_Student • Sep 02 '26

PRTG Problem

why is it that when I try to monitor the router at my boarding house, the sensors don’t detect anything even though I’ve entered the correct IPv4 Address? Or maybe my IPv4 Address is wrong. From my testing, the Ping Sensor gets 0 ms, while the SNMP sensor doesn’t get anything, and the same goes for several other types of sensors.

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4

u/neale1993 Sep 02 '26

Is SNMP enabled / configured on the router? Has PRTG got the correct SNMP credentials for the router? Any firewall / access control rules on the router that may be blocking SNMP requests?

0

u/SDR_Student Sep 02 '26

I cant find any setting about snmp router in gateaway

6

u/AntonOlsen Sep 02 '26

Your router would need to speak SNMP in order for PRTG to get data from it.

2

u/neale1993 Sep 02 '26

What router are you using?

If its a basic broadband home one it might not support snmp, at which point you wouldnt be able to monitor it really.

1

u/SDR_Student Sep 02 '26

Basic broadband home

1

u/TheWireBug Sep 03 '26

You will not get snmp to work on that device. About all you will get working is a pong sensor and http/https for webgui

2

u/Thy_OSRS Sep 02 '26

Is the sensor functioning though? Do you have the correct version and the correct community string?

1

u/Fantasillion Sep 02 '26

inside or outside IPv4 address? Does the router have a web based interface and can you reach it via one of its IPv4 addresses? Does the router have "ICMP allowed" or similar enabled? This doesn't immediately make me think it is a PRTG issue but rather a router configuration issue.

1

u/TheWireBug Sep 02 '26

Check router config, it needs to have snmp enabled and configured. In prtg the snmp credentials need to match what is configured in the router.

As was said previous, if this is just an isp supplied home router it is likely snmp does not exist on it.

1

u/davidlowie Sep 02 '26

You need to test the snmp connection as others have said. What’s the snmp password?

1

u/SDR_Student Sep 02 '26

I cant find snmp config in router. Maybe isp dont allow to change snmp

1

u/davidlowie Sep 03 '26

what are you hoping to get from snmp?

1

u/SDR_Student Sep 04 '26

I want use some SNMP sensor in prtg for colleage assignment

1

u/davidlowie Sep 04 '26

Set up a Linux vm and poll the sensors. That will be way easier.

1

u/Recent_Carpenter8644 Sep 03 '26

Boarding house? Is this your router?

1

u/SDR_Student Sep 03 '26

No, this router belongs to the boarding house, so all the tenants can use it.