Category Archives: Uncategorized

I have used GNS3 off and on for a long time. Over time, I struggled with the stability of the product. Prior to switching to the Mac, a fellow Ascolta Instructor–Patrick Geschwindner, clued me in on something. He had experimented … Continue reading →

Last week we examined a Cisco VPN construct called SVTI. This is basically using a “tunnel interface” in conjunction with an IPSec Protection profile. One of the limitations I mentioned was that, in comparison to GRE based tunnel interfaces, VTI … Continue reading →

We have all heard that telnet is bad. We have heard that it is an insecure protocol that sends information in clear text. Conceptually, that sounds simple. However, let’s take a look at what this really means. To demonstrate what … Continue reading →

I’ve had a request or two regarding what to expect at Cisco Live. If you are planning to attend Cisco Live 2012 and this is your first time to Cisco Live (formerly known as networkers, the article below is for … Continue reading →

In a branch office environment, it is often desirable to backhaul DHCP requests to a centralized DHCP server. DHCP request are initially sent to a broadcast address and therefore do not typically get forwarded through a router or other layer … Continue reading →

The OSI model is that thing that everyone seems to love to hate. The OSI is actually just a model that has its roots in the International Organization for Standardization. We’ve all had disagreements how certain protocols map to certain … Continue reading →

As the face behind PacketU.com, I wish all of my readers a very Merry Christmas and a Happy New Year. I encourage everyone to forget about Packets this season in order to enjoy time with family. Most importantly keep the … Continue reading →

I just stumbled on this video that was recorded back in July 2011.  In this interview, Marc and I briefly talk about some of the opportunities to individuals with the CCIE Security certification.  Additionally, we discuss some of the challenges … Continue reading →

According to this article, Georgia Tech researchers have found it possible to turn a nearby iPhone into a key logging device.  Their process not only utilizes the accelerometer, but also the gyroscope that made its debut in the iPhone 4.  … Continue reading →

Our FBI has caused their own version of a “force majeure” event.  According to The New York Times, the Federal Bureau of Investigation seized “3 enclosures” of equipment while actively investigating activities that were believed to be related to the … Continue reading →