The good folks over at Wireshark (formerly Ethereal) have a pretty comprehensive howto on capturing packets. While they wrote it specifically for use with Wireshark, it is also useful when working with any piece of equipment or software that requires you to get something off the wire (such as tcpdump, Snort or any other IDS software, NetSensory and more).

Wireshark Howto Capture

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This site has been around for a while, but I was recently reminded of how useful it is. It has links to a wide variety of technically oriented books, all available for free online. Some of them are a bit dated, but many are published within the past two years and many of the older ones deal with technology issues that just never go out of style. A great resource to remember when you need to quickly come up to speed on a new technology and don’t want to invest in dead trees, or just to build up your general background knowledge.

FreeTechBooks

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Now, I’m pretty good when it comes to networking, routing, etc., but I’ve never worked in a Cisco shop. Consequently, I can’t configure or troubleshoot my way out of a paper bag if a Cisco device stands between me and freedom. I always have to have some help just remembering the basics. Luckily, there are tons of great resources out there, and this one from The Network Administrator seems like a pretty good place to start. Cisco Router Tips Top 10 ’show’ Commands list the basics for getting the goods out of a Cisco router. It’s not a tutorial on configuring a Cisco, but it does list a pile of useful commands for getting information about how a router is configured, and what might be going on with it (assuming you are troubleshooting some sort of a problem). Good stuff.

Cisco Router Tips Top 10 ’show’ Commands

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