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Screencast: Knowledge Management in Technology – Part 3

Network Engineers have to manage a lot of information. Products, technologies, textbooks, study notes and research material as well as new protocols and features. Just simple tasks like keeping product manuals handy for 40 or 50 products is a real problem. How do you keep the information organised, referenced, accessible and useful ? Your employer […]

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Screencast: Knowledge Management in Technology – Part 2

Network Engineers have to manage a lot of information. Products, technologies, textbooks, study notes and research material as well as new protocols and features. Just simple tasks like keeping product manuals handy for 40 or 50 products is a real problem. How do you keep the information organised, referenced, accessible and useful ? Your employer […]

Screencast-Logo-1

Screencast: Knowledge Management in Technology – Part 1

Network Engineers have to manage a lot of information. Products, technologies, textbooks, study notes and research material as well as new protocols and features. Just simple tasks like keeping product manuals handy for 40 or 50 products is a real problem. How do you keep the information organised, referenced, accessible and useful ?

This three part screencast is about how I manage all the “inputs” so I don’t feel lost in information after many, many people asked.

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Service Models – “Pets and Cattle”

Two types of servers “pets” & “cattle” to denote service levels. Human oriented service models.

Response:Source Code Pro – monospaced terminal font from Adobe

Blog post from Adobe that discusses the background behind the Source Code monospace font and why it’s different. Today, my preferred monospace font for terminal use is Consolas but I’ll be trying this out for a while since it’s free and freely available. Once problem with Consolas is that it doesn’t anti-alias very well. That’s […]

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Top 20 Practical Cabling Tips for Network Engineers – Part One

Most engineers think that cable is simply plug and play. And mostly, that true. In recent years, Ethernet standards and manufacturing Here are 20 things that Network Engineers have forgotten or don’t know about network cabling in a two part series on things I have learned in twenty years of looking after networks.

Cat 5 and Cat 6 Bundle - side by side (Click for larger)

Size Differences – Cat5 and Cat6 Cable Bundles

I’ve talked bit about the problems of using Category 6 copper cabling in the data centre. The sheer size and weight of the cable is a serious problem. Here are some photos showing the comparison of Category 5 and Category 6 cable bundles.

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Basics: What’s the Difference between STP BPDU Guard and Root Guard

BPDU Guard and Root Guard are enhancements to Spanning Tree Protocol (STP) enhancements that improve the reliability of the protocol to unexpected events ad are primarily to ensure design enforcement ( integrity / security). There they must configured in specific locations in the networks.

Cisco NX-OS CLI Tip – Feature Enabled, License and CLI Syntax

When working on NX-OS it’s kind of annoying to attempt to use a feature that hasn’t been enabled and get an error message. Why not get an “not enabled” or “not licensed” error message ?

Tech Note: Command Line for Alternate PAC file for Chrome

Sometimes you need to use many different Proxy Auto Configuration files with a web browser, usually when testing or trying out new installation of the proxy servers.

11 Things About Using A Transparent or Layer 2 Firewall ?

You can deploy some modern firewalls in Layer 2 mode such that they are transpart

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WiFi Interference – MetaGeek Chanalyser and DBx Help!

I’ve got wireless problems that I can’t solve. I’m using the MetaGeek Chanalyser and a Wispy DBx to perform spectrum analysis and I can’t work out what these bursts are.

Basics: Cisco VLAN Trunking Protocol – Transparent discard and passing VTP Packets

It’s a common discussion about when Cisco VTP protocol is actually forwarded through Cisco switches and when it’s isn’t. I’ve always gotten it somewhat confused and when I stumbled across some old notes on the topic I had an ah-hah moment. I’m answering the equation about when using VTP in your network, which versions are risky – that’s risky is terms of how do you prevent VTP updates from ‘crossing’ a switch.

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From the “Why use a VPN?” Department. Microsoft RDP flaw announced.

Microsoft announces zero-day exploitable RDP flaw that gets full compromise of server. Expects worm to be available within thirty days. I get to gloat and say “I told you so” to all Microsoft admins everywhere.

Using Underscores, Hyphens or CamelCase in Naming Standards

I’ve been considering a small but vital problem in naming conventions in Networking. Namely, the use of underscores and hyphens in object names and devices. It’s a hot topic for argument when the time comes for corporate standards (and when Network Engineers have beverages in a public house). Now, I figure that there are three possible grammar options for making names – hyphens, underscore and CamelCase.

Can Fibre Optic Ethernet Cables Be Longer Than The Standard ?

Short Answer is “It depends, but usually yes.” Long answer follows with a discussion of launch power, receiver sensitivity, and cable losses.

Responding: On optimizing traffic for network virtualization

I’m responding to Brad Hedlund’s post “On optimizing traffic for network virtualization” where he seems to missed a key point. It’s about cost of ownership in terms of ability to troubleshoot.

ASA 5520 and ASA 5540 with only one DIMM Memory Socket – Counterfeit Hardware

There is a significant numbers of ASA5110 chassis that have been reworked to look and act like ASA5520 or ASA5540 firewalls. Refer this bug toolkit for more details.

Cisco Nexus NXOS and Fixing broken “switchto” syntax with alias

Why does Nexus NXOS use ‘switchto’ instead of ‘changeto’ for the CLI ?

Fibre Connectors

A short summary of the Fibre Cable Connectors, description and some notes on usage. This is summary notes and intended for reference.

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