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Charlie Schluting

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Networking 101: Understanding OSPF Routing (Part 2)
The real nuts and bolts of everyone’s IGP of choice, OSPF, are a bit complex, but strangely satisfying. After understanding how it works, we’re left wondering, “what else do we need?” Make sure to review the first part of our look at...
Networking 101: Understanding OSPF Routing
Open Shortest Path First is a robust link-state interior gateway protocol (IGP). People use OSPF when they discover that RIP just isn’t going to work for their larger network, or when they need very fast convergence. This installment of Networking 101...
Networking 101: Understanding RIP Routing
Welcome to the heart of networking: the routing protocols. We begin our series of looks at these protocols with one of the originals, and the most simple: RIP, the Routing Information Protocol. RIP, like all routing protocols, is designed to disseminate...
Networking 101: TCP In More Depth
Last week’s introduction to TCP promised that this article would enlighten, entertain and obviate all other documentation. Well the last one isn’t quite possible in this much space, but let’s go ahead and take a look at TCP operational...
Networking OSs: Pick a NOS, Any NOS?
Like all good things, this journey must come to an end. In the previous three articles, we’ve endeavored to logically discuss and explore the important considerations one should be mindful of when choosing an operating system for networked services. So...
Expanding Storage? Know Your NAS from Your SAN
SAN (Storage Area Network) solutions have historically targeted large, enterprise-grade consumers. With prices continually dropping, SAN storage is looking more and more attractive to budget-constrained operations. The technology is also changing, and...
On Your Network: What the Heck is a TCAM?
Let’s talk about TCAM hardware, Cisco SDM, and try to answer that elusive question: “why do I have to reboot my router to enable certain features, which in turn disables others?” First, CAM stands for Content Addressable Memory. A CAM is a...
Prevent DNS Cache Poisoning with BIND9
DNS cache poisoning has been around since 1993. The concept behind cache poisoning is to simply inject false information into a DNS server, where it will be cached. Then, when an unsuspecting user connects to, say, their bank’s website, they are...
Tune and Tweak NFS for Top Performance
As promised in our previous NFS article, we will now explore mount options in a bit more detail. We will also talk about differences between NFS implementations among various UNIX flavors, and the wonderful capability automatic mounting provides. More options...
Network Your Files in a Snap with NFS
NFS, Network File System, is the original file-sharing method among UNIX-based computers. Originally developed by Sun, NFS is still widely used, since it is a (relatively) simple and effective means to provide a centralized file server. We will be...