Want to analysis actual bandwidth provided to us by ISP

Posted on 2009-04-21
Last Modified: 2013-12-06
Hi friends !

I am working as Network Administrator in an educational institute. We are experiencing VERY SLOW internet connection.

We have purchased 3 Mbps / 1Mbps (Total 4 Mbps) Fiber Optics Lease Line from our ISP. ISP claims that it is giving the committed bandwidth but we are not using it or there is some problem in our server comfigurations or internal network.

We have Cisco Router 2620 at the end of our network. It is connected to ISP ONU device. Now I want to know how can I really analysis and find out that what our ISP is claiming is true or not.

Means I want to know the actual bandwidth we are getting. Someone told me to use SNMP tools but I don't know about them.

The matter is urgent. Please help.



Question by:JatinHemant
    LVL 3

    Assisted Solution

    Have you configured NetFlow and dumped it back to a machine running an analyzer?
    You can do it for free, there are plenty of opensource Netflow analyzers out there.


    Author Comment

    Thanks for reply.

    As I told you that I have Cisco 2620 Router. Can this utility "NetFlow" work on this router.

    I don't know anything about network analysis. Please guide me from where to start. Means do I need to install this NetFlow in Router then how and how to monitor on the Computer Screen ?


    LVL 3

    Assisted Solution

    A quick search through Experts Exchange turned up this solution:

    If you are using Linux here is one config guide for using cflow.

    Here is the Cisco Netflow page including configuration (look under NetFlow IOS Configuration)

    You need to read up on NetFlow a little before talking you through the configuration will be reasonable.
    Once you have a basic understanding give it a try. If you have problems post your scrubbed config with some basic data and we can talk you through it.

    Are you using a firewall inside of the 2620?
    If so what type?
    There are some firewall analyzers that might meet your needs as well.

    Hope this all helps.
    A basic config should not take you long even if it's your first one and the learning is priceless.

    LVL 32

    Accepted Solution


    To check the total bandwidth available to you, you may use the below tools;

    Iperf      Open-Source
    ttcp      Open-Source
    Netperf      Open-Source
    NetQoS      Propriety
    Qcheck      Propriety
    simplenetsoftware      Propriety
    Bandwidth Meter      Propriety

    IPerf is recommended personally.

    Now to check the bandwidth consumed by you, you need an SNMP-based NMS. There are plenty out here. For reference there are a few;


    SolarWinds Orion      Propriety
    Adventnet OP Manager      Propriety
    WhatsupGold      Propriety
    CommView      Propriety
    Observer      Propriety

    Open-Source NMS            

    Ntop      LAMP based NMS
    Bandwidthd      LAMP based NMS
    Nagios      LAMP based NMS
    JFFNMS      LAMP based NMS
    Hyperic HQ      LAMP based NMS
    Etherape      LAMP based NMS
    GroundWork      LAMP based NMS
    MRTG      RRDTool
    Cacti      RRDTool

    Recommendations are using Ntop, Cacti in Open-source and SolarWinds Orion, WhatsUPGold, or Observer in paid solutions.

    Does your router support Netflows? If it does then you can use a netflow analyzer. Below are a few examples;

    SolarWinds NetFlow Analyzer      NetFlow/SFlow
    Scrutinizer NetFlow/Sflow Analyzer      NetFlow/SFlow
    Caligare Flow Inspector      NetFlow/SFlow
    PRTG      NetFlow/RRDTool
    Adventnet Netflow Analyzer      NetFlow

    The benefict of these flow technologies is that you get per IP per protocol level details. If your router does not support netflow, then there is a work arround of NProbe;

    Author Comment

    Thanks for your replies.

    Let me go through the links and explore them.

    tom_philly !

    We are using Cisco 2620 Router and we have purchased Cisco 2801 Router. So I am going to replace the old with new one. And we are NOT using any firewall righ now. (Even no any ACL on Router)



    Author Comment

    Hi tom_philly ! Hi uetian1707 !

    Please hold on. I am still exploring the links you provided.


    Author Comment

    Hi both !

    My router's IOS doesn't support NetFlow. From another discussion on Experts-exchange, I got to know that to use NetFlow, I will have to upgrade my Router's IOS to use NetFlow. (This is the link for that discussion:

    For this, I will have to purchase new IOS. I don't have access to login at What may be the alternate solution.

    Please note that: I just want to check the actual bandwidth available on the router. Right now, I am NOT talking about how much we are utilizing. I am interested in knowing that we are getting what we purchased.

    LVL 32

    Assisted Solution

    by:Kamran Arshad
    I mentioned Nprobe.

    Author Comment


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