Solved

Netflow of similar without replacing our routers.

Posted on 2013-10-28
8
257 Views
Last Modified: 2013-10-29
Hello,
Perhaps someone can help me find a device that would suite our needs?  We currently have Cisco 3750 switches at each of our sites that are connected to an MPLS network.  Some of the sites have very low speed links and are often saturated.  We wanted to setup NETFLOW on the ports in question so we can easily see where the traffic is coming from but the Cisco 3750 switches do not support it.  Instead of replacing all our switches, we'd like to see if there is some sort of IN-LINE appliance or solution so that we can keep everything as is and just add something within the path of our router and MPLS.  Thanks.
0
Comment
Question by:sthubert
  • 5
  • 3
8 Comments
 
LVL 20

Expert Comment

by:rauenpc
ID: 39606867
Although this isn't inline, PRTG is an application that does all sorts of network monitoring - Netflow, sFlow, SNMP, WMI, etc. It also has the ability to do packet sniffing and reporting based on the sniff. If you were to setup the WAN-facing port on the 3750 as a span source, and the PRTG server as a destination, you would be able to get detailed reports on that info. Performance and historical data will be based on the speed of the machine you configure this on and the disk space available. I believe you can get a free version that allows up to 10 sensors, so you might be able to accomplish this particular task for free, aside from the machine it runs on.
0
 

Author Comment

by:sthubert
ID: 39607037
Would I simply be able to plug this appliance in the WAN VLAN and capture the data the same way a WireShark would?  Does it provide good reporting and top talkers based on bandwidth?
0
 

Author Comment

by:sthubert
ID: 39607048
Or perhaps I would setup a port mirror and plug the mirrored port into the appliance?


...
conf t
monitor session 1 source interface Gigabit 1/0/x
monitor session 1 destination interface Gigabit 1/0/x
0
 
LVL 20

Expert Comment

by:rauenpc
ID: 39608936
With PRTG, this would be a port mirror. PRTG won't pass traffic through two interfaces, so inline plainly isn't an option. Give it a shot for free, you just need a machine to load it on, and the port mirror to be setup.

http://www.paessler.com/prtg/?source=adwords&campaign=prtg_search_campaign_us&adgroup=prtg_network_monitor&adnum=011&gclid=CL38jYapvLoCFfA7Mgodbw0AsA
0
IT, Stop Being Called Into Every Meeting

Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

 

Author Comment

by:sthubert
ID: 39609273
I just installed PRTG but like I mentioned my Cisco Routers do not support NETFLOW so how do I use PRTG to capture network data?

I'm really looking for a software or device that can either use to create NETFLOW's or to capture and analyze network data.
0
 
LVL 20

Accepted Solution

by:
rauenpc earned 500 total points
ID: 39609310
When you install netflow, you have a device called the Probe, which is the server itself. If you go to add a sensor to the probe, you can search for sniffer. One choice will be packet sniffer which will also require you to choose an interface. From there, when viewing the sensor you should be able to see all the types of traffic, as well as the who and where, assuming that your port mirror is setup properly. You will likely need two physical interfaces on the PRTG server to handle this.
0
 

Author Comment

by:sthubert
ID: 39609336
WOW!  Works like a charm!  Thanks very much for your HELP I will easily be able to deploy this today!
0
 

Author Closing Comment

by:sthubert
ID: 39609338
Great solution
0

Featured Post

Give your grad a cloud of their own!

With up to 8TB of storage, give your favorite graduate their own personal cloud to centralize all their photos, videos and music in one safe place. They can save, sync and share all their stuff, and automatic photo backup helps free up space on their smartphone and tablet.

Join & Write a Comment

Suggested Solutions

SSL is a very common protocol used these days when browsing the web.  The purpose is to provide security to communication, but how does it do it?  There are several pieces at work that have to be setup before SSL will even work and it requires both …
PRTG Network Monitor lets you monitor your bandwidth usage, so you know who is using up your bandwidth, and what they're using it for.
Viewers will learn how to properly install and use Secure Shell (SSH) to work on projects or homework remotely. Download Secure Shell: Follow basic installation instructions: Open Secure Shell and use "Quick Connect" to enter credentials includi…
Here's a very brief overview of the methods PRTG Network Monitor (https://www.paessler.com/prtg) offers for monitoring bandwidth, to help you decide which methods you´d like to investigate in more detail.  The methods are covered in more detail in o…

747 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

12 Experts available now in Live!

Get 1:1 Help Now