Tag Archives: cisco

Securing Your Connection Anywhere You Go

We all know that there are a lot of incomplete security models. Firesheep made this fact painfully obvious to those who regularly work from public hotspots. Although this issue extends beyond insecure wireless deployments, unencrypted hotspots are an easy target. … Continue reading

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Using Ping Sweep to Find MTU Ceiling

Earlier this week I had breakfast with a very interesting group. One of those present had an extensive history with Cisco systems. We talked about his tenure and several of the projects that he had been involved in. For some … Continue reading

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IP Subnetting Part 5: Subnetting Across the Octet Boundary

Throughout this series, we have examined several fundamental building blocks of subnetting. In IP Subnetting Part 4, we looked at what was required to subnet a Class C network. This article takes the fundamentals one step further and looks at … Continue reading

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IP Subnetting Part 4: Subnetting a Class C Network

At this point in the PacketU subnetting series, we have worked through the following– What is a Subnet? Simple Subnetting Examples Understanding the Binary This article takes the concept of subnetting to the next step. Today we are going to look at … Continue reading

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Useful Links — Cisco Quicklinks

I just wanted to take a quick moment to share a site Dan DeBusschere has created. This site is a list of very useful config snippets, information and links. Most of the content is focused on Datacenter and UCS. If … Continue reading

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IP Subnetting Part 3: Understanding the Binary

I’ve often stated how simple subnetting really is. While each individual concept is rather simple, it is the combination that make the holistic process challenging. If we, as humans, could look at the process more like computers and network devices, … Continue reading

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Using Cisco’s DevNet “All-in-One VM” as a Free Router Lab

I know many have been [not so patiently] waiting for the arrival of a Cisco virtual lab. Although I haven’t heard any official release date for VIRL or CML, there is a small scale virtual router lab available today. This lab is … Continue reading

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IP Subnetting Part 2: Simple Subnetting Examples

Subnetting is a foundational concept in IP networking. Although it is often misunderstood and even dreaded, this is a simple concept if we could look at things from the perspective of binary. However the combination of binary concepts, IP addressing and subnet masking is … Continue reading

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Cisco IOS – Understanding IGP Network Statements

One of the things that I find both counterintuitive and often misunderstood is the role of the network command in interior gateway protocols. This command is used in the router configuration mode on Cisco devices. While there are some protocol … Continue reading

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Understanding Tunnel Path MTU Discovery

After experimenting with Tunnel Path MTU Discovery on Cisco IOS based devices, I understand it’s operation. The configuration is simple and there are only a couple of optional parameters that may be set. This feature basically extends the Path MTU Discovery to … Continue reading

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Cisco Announces 2014 VIPs for CLN and CSC

Earlier today, Cisco announced those who will be part of their Designated VIP program for 2014. This program encompasses both the Cisco Learning Network and Cisco Support Community. This is one way that the company recognizes those who spend a … Continue reading

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Defining Cisco’s onePK

I’m going to be the first to admit that I feel like a fresher when it comes to discussions about software defined networking, or SDN. The concepts of programatic networking are quite radical at first glance. Like many others, I … Continue reading

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