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Charlie Schluting

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Cisco Flex Links: Time to Retire Spanning Tree?
Cisco Flex Links gives network operators a simple, reliable, and more scalable method of layer 2 redundancy. The Spanning Tree Protocol (STP) is not destined for the scrap bin, but it will certainly fall out of favor with many enterprise networks. Flex Links...
Troubleshoot Your Network With Cisco SPAN Ports
The Cisco Switch Port Analyzer, or SPAN, enables advanced network troubleshooting and the implementation of robust monitoring solutions. Port mirroring, as it’s also called, is required to deploy in-depth network monitoring. A SPAN port can be...
Networking 101: Understanding TCP, the Protocol
TCP is used everywhere, and understanding how TCP operates enables network and systems administrators to properly troubleshoot network communication issues. TCP is wonderfully complex, but don’t worry: We aren’t going to tell you to go read RFC...
Networking 101: Understanding the Data Link Layer
What’s more important than IP and routing? Well, Layer 2 is much more important when it’s broken. Many people don’t have the Spanning Tree Protocol (STP) (define) knowledge necessary to implement a layer 2 network that’s resilient. A...
Networking 101: Understanding Layers
Continuing our journey, it’s time to take a trip up the OSI Reference Model, and learn what this mysterious thing is all about. The network stack is of great significance, but not so much that it’s the first thing you should learn. We’ve...
Networking 101: Understanding the Internet Protocol
Welcome back! This edition of Networking 101 will give you the IP knowledge required to understand routing issues. Most everything on the Internet uses IP, and unlike Ethernet, knowing this protocol is pivotal to understanding how networking works with...
Practical VM Architecture: How Do You Scale?
Virtualization allows you to better utilize your servers, and effectively increasing that utilization can be a big cost-saver. Now that it is so easy to duplicate server instances using virtual machines, it makes sense to start talking about the best way to...
LDAP Basics: Master Queries and Filters
Last week we explained how LDAP directories work, without really explaining how to use them. This week we’ll show how LDAP queries work, after explaining how the protocol works. The LDAP protocol supports just a few fairly easy to understand operations....
Back to Basics With Unix Permissions
The most basic, yet important part of mastering Unix is to fully understand the nuances of file permissions. Tools exist to manage permissions easily, but true enlightenment and quick troubleshooting skills come to those who wholly master the concept....
Ease Disaster Recovery With SAN Booting
When creating a disaster recovery plan, try not to only think about large-scale disasters. The more realistic disasters, perhaps a failure of an entire blade server, are much more likely to be relevant. In this article, we will talk about the concept of...