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Network Scanner that shows IP that is consuming most bandwidth

Posted on 2009-04-06
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Last Modified: 2016-11-29
i have a network, where the bandwidth consumption peaks for hours and even days at a time. it slows my network to a crawl. i tried unplugging all network cables one by one to find the problem, but that didnt work.

is there a software or something i can do to see which IP is consuming the most bandwidth?
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Question by:datatechdc
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by:mickfinley
ID: 24083256
PRTG Traffic grapher will show you the port consuming the bandwidth, but not ip.
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by:datatechdc
ID: 24083800
where can i get that from?
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mickfinley earned 500 total points
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by:Kimberley from Paessler
ID: 41905678
PRTG has come a long way since this question was first opened!  

There are different methods available to see who or what is hogging your bandwidth, but the two most common are SNMP and flow:

1.      SNMP (Simple Network Management Protocol) provides traffic counters so you can collect statistics about the amount of traffic you have on a connection, over time, to see if you have enough capacity.  SNMP is an industry standard that’s supported by pretty much every vendor.  SNMP shows you the amount of traffic in/out, the number of broadcasts, multicasts, errors or discards you have on each port.

SNMP is supported by every major network vendor and every major operating system, so you’re not limited to switches here – you can use SNMP to collect stats not only from switches, but also from servers, virtual servers, storage systems, and workstations.

PRTG Network Monitor includes SNMP traffic sensors out-of-the box, so all you need to do is enter your SNMP credentials into PRTG and it will start monitoring your traffic for you.


2.      The flow protocols include NetFlow (Cisco, VMware), jFLow (Juniper), sFlow (HP) and IPFIX (Cisco, VMware).  The results from all of these are similar, and they show you not only how much traffic you have, but what machines and what protocols are using the most bandwidth.  So, you can see if one specific user or a certain application is using more than their fair share.

The switches collect data about all of the traffic flows passing through that switch, and then send summarized information about these flows to a flow “receiver”.  PRTG includes receivers for NetFlow v5, NetFlow v9, jFlow, sFlow and IPFIX, so you only need to enable flow on your switches and configure your PRTG server as the recipient of the flows.  PRTG will then analyze the incoming flow data and will show you the top talkers, top protocols, and top connections.

To see the PRTG bandwidth sensors in action, check out our video tutorials:
•      Bandwidth Monitoring with SNMP and WMI
•      Bandwidth Monitoring with NetFlow and Packet Sniffing

If you'd like to give PRTG a try, download our free 30-day trial version with unlimited sensors ([Video] What is a Sensor?).  After the 30 days it will automatically revert to our 100-sensor freeware version.

To give you an idea of what PRTG looks like, here's a screenshot from a netflow sensor:
PRTG NetFlow Sensor
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