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What does the program netflow analyzer do?
NetFlow Analyzer is a complete traffic analytics tool. NetFlow Analyzer leverages flow technologies to provide real time visibility into the network bandwidth performance.
How would someone describe Cisco IOS NetFlow?
Someone would describe Cisco IOS NetFlow by using a visual image and labeling and analyzing key features of the service or product whilst also stating the purpose of the Cisco IOS NetFlow.
What is IP accounting?
IP Accounting is a very useful accounting feature in Cisco IOS, but it's not as well known as other features, such as NetFlow. The fact that Cisco has considered replacing IP Accounting by adding new features to NetFlow potentially turns IP Accounting into a corner case solution. However, compared to NetFlow, IP Accounting offers some advantages that make it an interesting feature to investigate: easy results retrieval via a MIB and limited resource consumption. Furthermore, access-list accounting currently cannot be solved with the NetFlow implementation.
What are some advantages of NetFlow?
NetFlow was developed by Cisco Systems to allow monitoring of internet and network traffic. The advantage of this is that possible security threats can be intercepted and workers slacking off can be monitored.
What can be monitored?
You can monitor your network performance ,your internet speed and even your netflow traffic.. Netflow Traffic Analyzer enables you to quantify exactly how your network is being used, by whom, and for what purpose. Network Monitoring helps you to quickly detect, diagnose, and resolve performance issues with your dynamic network.
I am looking for a network performance monitoring program, any suggestions?
I have been using OPNET ACE Analyst for a few years and been very pleased so far. We have been using Nimsoft at my office for the past year and have had great results so far. WhatsUp Gold network monitoring software and NetFlow Monitor.
Is there a free traffic analyzer software?
The most known free traffic analyzer software is NetFlow. The advantage with a traffic analyzer software is that you can see that your servers are online and there is no problems.
Is it possible to link a NetFlow IP address to a computer inventory tool?
Depending on how open the solutions are, general linking is usually possible between different vendor utilities. It usually requires a bit of scripting, and prepare to sit on hold as most support organizations don't know much about their own database schemas.I heard that Ipswitch is building a desktop inventory solution similar to BelManage from Belarc. Perhaps this is an attempt to help WhatsUp Gold compete more effectively against Solarwinds Orion.
Does SNMP act as a complete solution to network monitoring?
It's the backbone of network monitoring, but it's not the only thing that can or should be used. Microsoft for example does not recommend using SNMP for OS monitoring on security grounds. The more advanced monitoring software out there like NetCrunch 8 will use performance data from the OS itself, instead of relying on SNMP. Flow data like from NetFlow can also give you much deeper insight into your network traffic than SNMP can. Most simpler devices will rely on SNMP however, like your IP phones, printers, etc.
What is the best tool to monitor network traffic?
A complex question with many different options at many different price points. If you want to get the most insightful data, you'll want switches and routers that are NetFlow enabled, and something like NetCrunch 8 that can read and display the collected data.
What is bandwidth issues?
1. Confirm That It's a Bandwidth ProblemAs was stated above, not every report of a slow network connection is due to a bandwidth issue, but just about every bandwidth issue results in slow network performance for at least some users. So, if the initial report is slow network performance, we must first determine if it's related to bandwidth oversubscription or not. Fortunately, with the wide range of choices out there for network monitoring solutions, some based on flow-based technologies (NetFlow, sFlow, etc.) and some that are packet-based, correlating a problem report with overall network activity has become fairly straightforward. One simply needs to "rewind" the network activity to the period of time where slow network performance was reported, isolate the flow where the event was experienced, and then expand the view to include data collected at the router or switch level for the flow to see if the network link was oversubscribed. If so, a bandwidth issue of some sort is probably the cause, and a more detailed investigation is in order. Alternatively, most network monitoring solutions provide flexible alarms and notifications based on measurements like percentage of bandwidth utilization on a link. If a triggered alarm corresponds to the time of the report of poor performance, you've already answered the first question.2. Determine If It's a One-Time EventIf your network monitoring solution indicates that a bandwidth threshold has been exceeded, the next thing to determine is the frequency of such an event. Is this the first time, or have similar incidents occurred in the recent past? If it is the first occurrence, and especially if it is still ongoing, you should dig in quickly to see who the top talker is. Though the event could be benign, like too much video being downloaded by too many users on the day of a popular event, it could also be an indication of something serious, like a distributed denial of service attack or a worm infection. Regardless of the cause, a spike in bandwidth that is unpredicted and outside of the norms for your network should be taken seriously and addressed immediately.If similar bandwidth spikes have occurred before, or if you've already determined that certain spikes are part of the norm (eg. order processing spikes first thing in the morning when the operations department starts their day), make sure that the current spike conforms to one of these norms. The best way to determine this is to have current baseline measurements of typical network usage, since it is highly unlikely that network usage is constant throughout the day. Understanding what the load is at different times of the day, and what the peak historical usage has ever been, will help you tremendously in determining the severity of the next spike in bandwidth usage.3. Remove Unnecessary TrafficMore often than not, bandwidth problems come from unnecessary traffic on the network, like real-time video streaming during the 7th game of the World Series. By pruning your WLAN traffic and removing or reducing superfluous demands through the use of bandwidth shaping technologies you can better control overall bandwidth usage and ensure that adequate bandwidth is always available for your mission critical applications.These three steps should help you determine when and where bandwidth issues occur and how you can better manage your network to stop slow network performance caused by network bandwidth spikes.
