PRTG Graphs


I have noticed that usage of my bandwidth is high during the night.  My PRTG traffic graph always was show minimum activity during night but now i have equal spikes.

Do you know how to find out what host is using the bandwidth ?

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Dear aucklandnz,

please check the link :

Good Luck
Fred MarshallPrincipalCommented:
There are two ways that you might consider:

1) Since you have SNMP running already.... you didn't say how/where you get the data shown.  If you have managed switches that reasonably isolate the various devices then you might monitor port traffic using PRTG and see which one matches the traffic you're seeing.  That's good for looking at traffic patterns.

2) Again, if you have managed switches then you can mirror port-by-port onto a monitoring computer - need a cable for this.  I usually use a 2nd NIC with a nonsense private IP address manually entered and connect it to the mirror port on the switch.  Then, use Wireshark to sniff/capture the packets at the firewall or modem or gateway.  Look at Statistics / Endpoints of the data collected.  You want to grab the packets during a peak to see where the traffic is coming from and where it's going to.  Alternately you might temporarily insert a tap or a hub for the same purpose.
aucklandnzAuthor Commented:
i found the cause.

It was my exchange, someone sent a huge email and my exchange was rejecting it. Unfortunately exchange was downloading the content before rejecting it. i called the sender and they remove it from their queues.

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