Latest Posts

Today’s blog is about things to look out for, and some things to look at, to fix FCIP and SRDF performance problems. FCIP and SRDF are technologies used to replicate [...]

This is the second article on my series on QoS on the Nexus 5000 (N5K) and Nexus 2000 (N2K) for medical grade networks. The first article was QoS on the Nexus 5000/2000 - Part 1. (I apologize it took me so long to get back to this series!)In the previous…

In my last posts, Application Analysis Using TCP Retransmissions, Part 2, I described how application performance is impacted by TCP Retransmissions. Of course, there are many other causes of poor [...]

My intent today is to continue our quest for Simplicity in Network Design in a more systematic fashion, by tackling Simplicity and Layer 2.What is simple and what is not [...]

In my last post, Wikipedia on Transmission Control Protocol). A packet is assumed to be lost when an ACK has not been received within 2 * RTT. So network buffering [...]

This blog discusses simplicity of network design, Segmentation and Security. It continues the series started in Designing a Medical Grade Network Using BGP with VRF-Lite for Shared Service Support CE Design [...]

I was talking to some network engineers at an organization I will call Charlie. They thought they had a redundant network, but after looking at their network I believe it [...]

I’ve been contemplating simplicity in design over the last couple of years, while doing design assessments and grappling with just what is the right design in certain situations. I’d like [...]

An organization named Able once acquired a small organization called Baker. While reviewing Baker’s network, I found pervasive and overlapping configuration issues. I thought I’d briefly describe the issues here. [...]

On October 12, 2011 Terry Slattery will be presenting at the Enterprise Connect Webinar: Top 3 Reasons Your Network is Slow and How to Fix It.He plans to cover: The [...]

I’ve been doing a number of network assessments recently and one of the factors that I use to determine network health is the number of TCP retransmissions that occur. I [...]

Here is my list of the top ten security mistakes that IT staff makes.  These mistakes leave your network vulnerable to attack and compromise. Mistake #7:  Not compartmentalizing your internal network.