Avoid Traffic Headaches on the Road and in your Network

Traffic congestion on the way to work is a sure way to get an immediate headache. That is why I’m a big fan of viewing live traffic patterns from my smart phone. I get a live view of traffic that shows which routes are congested and clear. With this information, I arrive at the office much faster and in a better state of mind (my co-workers agree).

Wouldn’t it be nice if finding congestion in network traffic was as simple as flipping on your smartphone and pressing a couple of buttons? Maybe someday. In the mean time, to make life as simple as possible, I use dopplerVUE which has Netflow built in, so I can look deep into routers and capture rich details about what types of traffic, which IPs are talking and how much bandwidth is being used. Take a look at dopplerVUE in action below. You can try it out free for 30 days.

If you don’t have access to tools like dopplerVUE, there are free tools that can help you as long as you’re willing to invest the time.


There are basically two types of techniques to monitor congestion - packet monitoring and packet capturing. I’ve listed some free tools for both methods below.

Packet Monitoring
Packet monitors watch the number of packets whizzing by and tell you a little bit of information about them, such as the number of packets and if there are any errors in the packet. But that is about it, you don’t get much more detail. So this method is good for watching long term trends.


1) For Windows users, look at the network interface properties. The display shows you packets sent and received. This is an easy way to see if your interface is working.

2) The Windows command line provides a number of useful tools to determine the performance of your TCP/IP connection. The Netstat command can give you details about each TCP connection including how many packets have been processed. Below is the result of a netstat –e command.

A list of the most common communications related commands available for the Windows command line are listed below:

Packet Capturing
Packet capture actually stores a copy of each packet that comes by which allows you to look at all characteristics of the packet. But all this detail comes with a down side - it will eat up storage space very quickly. So this method is best to capture a small sample of traffic for deep analysis.


1) For packet capture, the gold standard for open source tools is Wireshark. Here is a screenshot of a packet capture done with Wireshark on my laptop. As you can see, every packet is listed with full details about source and destination address, protocol type and data contents.

Wireshark is one of many open source tools that leverage the Winpcap tool for network monitoring. A list of tools that use Winpcap can be found here.


2) Windows server users have access to a similar tool called Network Monitor that helps monitor network traffic. Below is a screenshot of Network Monitor in action.

I hope these tools help you avoid congestion on your way to work and in your network.

What is Fueling Future Network Growth? Your Thoughts...

What do you think is driving future network growth?According to a new Cisco study, many residential, business, and mobile IP networking trends are being driven largely by a combination of video, social networking and advanced collaboration applications, termed “visual” networking traffic.

Service provider networks are carrying a significant amount of visual networking traffic, with more than one-third of the average global broadband connection supporting video, social networking and collaboration applications each month. Maybe social networking isn’t a fad.                                                                             

Cisco VNI (Visual Networking Index) Usage Highlights:

Aggregate Broadband Findings (Q3CY09):                               

- Globally, the average broadband connection (primarily residential subscribers and some business users) generates approximately 11.4 gigabytes of Internet traffic per month.

Per connection per day, this amount is roughly equivalent to downloading 3,000 text emails, 100 MP3 music files or 360 text-only e-books.)

- Globally, the average broadband connection consumes about 4.3 gigabytes of visual networking applications advanced services such as video, social networking and collaboration) traffic per month.

Per connection per day, this amount is roughly the equivalent of approximately 20.5 short-form Internet videos or approximately 1.1 hours of Internet video, whether streamed on its own, embedded in a Web page, or viewed as part of video communications.)

- Top 1 percent of global subscribers generated more than 20 percent of all traffic.

- Top 10 percent of global subscribers generated more than 60 percent of all traffic.

Peak Broadband Usage During Internet Prime Time:

- In an average day over the reported quarter, Internet "prime time" spans from approximately 9 p.m to 1 a.m. around the world. This contrasts with broadcast TV prime time, which is generally from 7 p.m. to 11 p.m. across most global markets.

- 25 percent (or 93.3 megabytes per day per connection) of global Internet traffic is generated during the Internet "prime time" period.

- A peak Internet hour has 20 percent more traffic than a nonpeak Internet hour. The peak Internet hour averages 18 megabytes of traffic per connection (per hour), while nonpeak Internet hours average 15 megabytes of traffic per connection (per hour).

The peak Internet visual networking hour has almost 25 percent more traffic than average hourly Internet traffic.

It’s one thing to imagine the amount of traffic passing through networks every day, but it’s another to actually see the numbers. My favorite statistic is the number of GBs used per connection per day compared to text messages, e-books and music. The numbers are huge! I can’t imagine sending 3,000 text messages per day, can you?

What do you think about these findings? What are the future implications? I’m interested in hearing your thoughts.

Before Adding More Bandwidth…

Does your network reach capacity at similar times every day? If so, before you decide to add more bandwidth at additional cost, think about adjusting traffic patterns at no cost.

As a first step, consider using a network monitoring tool to baseline the most common time periods when your network is at capacity. With this critical information, you can take some pro-active steps to optimize your network traffic.

Move maintenance tasks such as back-ups, updates, source control synchronization and large file transfers to off peak periods to decrease the load on the network.

If you can’t alter the timeline for maintenance tasks, encourage users to schedule bandwidth intensive tasks (video teleconferencing and webcasts) that are not time sensitive to business operations to off peak periods. Most users want the best possible viewing experience and will appreciate being able to schedule online events to take advantage of improved network availability.

Of course, if you don’t have flexibility to adjust traffic patterns to optimize the network, it may be time to add more bandwidth.