Find out who is eating your bandwidth with ntopng

Posted by on Apr 27, 2017 in Network Traffic Monitoring | 0 comments

Who is eating my bandwidth

Who really knows what are the protocols used in the local network? Usually with netflow you can distinguish traffic per l4 port (80=http,443=https,..) but this is no more sufficient. Some applications use dynamic ports (see nfs, ftp, routed sap, …), several applications use the same ports, how can we distinguish them?

Applications grow and change really fast (like all stuff in IT world) and it is not easy to keep your netflow analysis tool aligned with this evolution.

Ntopng is able to automatically detect the applications that are generating the traffic without having to define and use filters.

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Why does my local network latency increase during working hours?

Posted by on Sep 22, 2016 in Capacity Management, NetEye, Network Traffic Monitoring, Real User Experience Monitoring | 0 comments

Sometimes you get a higher network latency during certain periods of the day.

Network section of a datacenter (1 Gigabit Ethernet) with normal, constant latency throughout the day

Network section of a datacenter (1 Gigabit Ethernet) with normal, constant latency throughout the day. Please consider that the typical latency for 1 Gigabit Ethernet connections is minor than 5ms.

 

Network section of a datacenter (1 Gigabit Ethernet) with increased latency during working hours

Network section of a datacenter (1 Gigabit Ethernet) with increased latency during working hours. Please consider that the typical latency for 1 Gigabit Ethernet connections is minor than 5ms.

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Discover Overloaded Machines with NetEye RUE

Posted by on Feb 24, 2016 in NetEye, Real User Experience Monitoring | 0 comments

With NetEye RUE we are able to build up a reliable Application and Network Performance Monitoring, by analyzing the real traffic. However, is there also a possibility to gather information about the state of the PCs and servers?

Yes, it is! In the TCP communication, there exists a certain event, which informs us about the state of “suffering” of a PC/server or application. This event is called zero window. If the PC/server is monitored with NetEye, we are even able to depict the state of the machine during the point in time when the event occurred.

Zero Window NetEye

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Network Performance: Explicit Congestion Notification

Posted by on Jan 15, 2016 in NetEye, Real User Experience Monitoring | 0 comments

When the network apparatuses are asking for help.

We often hear of network congestion, perhaps a little less often than what are the mechanisms that try to manage it.

The primary mechanism for managing the congestion is the drop packet. When the apparatus is in trouble it throws packets in a pseudo-random order to save time (and bandwidth), by trusting that the application protocols are able to manage their packet loss.

What are the effects of this situation for the applications that receive the packet loss?

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