About Charles Galler

Charles is a network and UC engineer for an integrator. He has worked in the networking industry for about 15 years. He started as a network administrator for a small CLEC (carrier) where he did it all in internal IT and worked on the carrier network. After the CLEC, Charles went to work for a large healthcare organization in the Houston area and stayed with them for about three and a half years. Now he works for a reseller in the professional services part of the organization. He is currently studying for his CCIE in Routing and Switching and plans on passing it sometime. You can find him on the Twitter @twidfeki.

Planning a Project Before Your Execution

This year I have worked on a number of projects and most of them had no planning while others had very little. The planning … [Read more...]

Cisco Internal VLAN Usage


About a month ago I worked on an old CatOS switch. Working on this switch reminded me about some of the differences between … [Read more...]

Out with the old, in with the new


A few weeks ago I was asked to help a client turn up and move everything over to a new network. I have done this many times … [Read more...]

Securing a DMVPN spoke – Part 2

In Part 1 we went through protecting the spoke from the outside world on the Internet and using the stateful inspection … [Read more...]

Securing a DMVPN spoke – Part 1

For organizations that have many remote offices a DMVPN solution is a great option. You can purchase a cheap DSL or cable … [Read more...]

Teamwork in a Disconnected Environment

As an introvert, I don't like ice breakers or team building exercises at team meetings. Building the team camaraderie is done … [Read more...]

Using IP SLA Delay Feature to Safely Monitor Lossy Links


IP SLA is a great feature if you want to add some automation and intelligence into the network. SLA is no SDN/OpenFlow, but … [Read more...]

Network Documentation Best Practices: What’s Important & How To Track It


As a consultant, I have done several network assessments for clients. One of the biggest items that is almost always missing … [Read more...]

Cisco Configuration Archive & Rollback: Using ‘Revert’ Instead of ‘Reload’


I wrote an earlier blog article about using the reload command. The reload command used to be the only tool to recover from … [Read more...]

VTP v2 Transparent Mode: Mismatched Domain Names Cause Advertisements To Be Dropped


Cisco's documentation on VTP version 2 transparent mode states that it will pass VTP messages without inspecting the domain … [Read more...]

A Cisco IOS Template With Commands & Explanations: Expecting The Same Result

We have all heard that the definition of insanity is doing the same thing over and over and expecting a different result. … [Read more...]

The Power and Peril of the IOS Reload Command


Over the years, I have used the reload command for more than upgrading the IOS on a switch or router. The reload command has … [Read more...]