About Cloud Toad

CloudToad is adrift on the great sea of network serenity.
CCIE #15672 (RS, SP)
JNCIE-M #721
Twitter: @cloudtoad
LinkedIn: http://www.linkedin.com/in/derickwinkworth
Derick's opinions are his own and do not reflect those of the company he works for.

IT is dead. All hail Systems Engineering!


IT vendors live or die based on their ability to manage complexity on behalf of their users. This is true of all vendors: … [Read more...]

Root Cause Analysis, or Path Scrub?

In the Service-Provider world, there is the concept of a "circuit design review" or "path scrub" or "Class A."  Typically you … [Read more...]

Infineta and Parallelization, Part 1


1. Opinions are like... In the past 5 years I've participated in three proper evaluations of WAN acceleration products. … [Read more...]

The Sad State of Data Center Networking

The Inconsistent Network

Something about next-generation Data Center networking has been bothering me lately.  For a while now, there has been this … [Read more...]

Virtualizing Network Services, Part 1: The Beginning

An abstract representation of network functions

  The Purpose of the "Network" In this series of articles I intend to walk through a series of diagrams with a … [Read more...]

Pill-Chomping Hackers and Security Whack-a-Mole

Tonight on twitter I saw an argument about how social-security numbers and credit card numbers are benign pieces of … [Read more...]

Network, Interrupted

Dear Cisco and Juniper: Its been a good run, Cisco.  Thank you for the CCIE.  Thank you Juniper for the JNCIE.  I learned … [Read more...]

Being Good at IT Stuff

I've been meaning to write a brief entry about careers in IT.  After reading Ethan's  CCIE vs  Experience and First Job … [Read more...]

DLSw+ performance

Just days before 2012 arrives and heralds in the Mayan apocalypse, I thought I'd do something ridiculous.   Like shoot heroin … [Read more...]

SQL*Net (a.k.a Oracle TNS) and firewalls…

Most vendor’s firewalls have a SQL ALG that handles SQL*Net traffic. They listen on TCP port 1521. SQL*Net is based on … [Read more...]

More Open Flow Symposium notes…


1. OpenFlow and standards. "Laws, decrees, edicts, ordinances, writs will shower down upon the poor people like … [Read more...]

Secure multi-tenant VMWare, vGW, and VLAN Normalization


Yesterday I did some lab work with an SE from Juniper with their hypervisor-based FW solution, vGW.  As a virtual-networking … [Read more...]

“Virtual-Networking” is as meaningless a term as “Cloud” now.

With so much virtual-networking stuff going on these days, its worth taking a step back and trying to understand what the … [Read more...]

More OpenFlow thoughts… then I’m done, I promise.


Lets get straight into it.  Below is a diagram depicting a hypothetical (and entirely realistic) OpenFlow network.  I pieced … [Read more...]

Big Switch Network, OpenFlow, and Virtual-Networking

There's been a lot of movement happening lately under the "Virtual Networking" moniker.  I sat down this morning and thought … [Read more...]