What is this?

This knowledgebase contains questions and answers about PRTG Network Monitor and network monitoring in general.

Learn more

PRTG Network Monitor

Intuitive to Use. Easy to manage.
More than 500,000 users rely on Paessler PRTG every day. Find out how you can reduce cost, increase QoS and ease planning, as well.

Free Download

Top Tags

View all Tags

Auto discover through a firewall



Hi, I am trying to auto-discover sensor on Cisco routers and it only discovers ping. These cisco routers have access-lists on them so only permit specific ports and protocols through. what port and protocols do I need to permit on the access-list for PRTG to get information from all the sensors that are available by default on Cisco routers? i.e other interfaces, Memory, CPU etc.. Thanks, Jaime

cisco-router port prtg

Created on Mar 8, 2012 12:16:26 PM

1 Reply




usually it's at least SNMP on UDP Port 161 (on the target device).

best regards.

Created on Mar 8, 2012 4:07:27 PM by  Torsten Lindner [Paessler Support]

Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.