Computers can communicate over networks. (Surprise!) That’s how you’re reading this post. The machine that this site is hosted on is listening for requests for connection. When it receives a request it answers back with a web page. In fact, computers can listen for a great many different kinds of connection at the same time. In networking we talk about a computer listening on a given “port”. The web server for this site (and most web sites) listens on what’s called port 80. There are 65535 possible network ports that a computer can listen for incoming connections on.
Category: Computers
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Network Security guide for the home or small business network – preface
OK, this is an ambitious idea, but the two articles on Titan Rain and the lack of IT security training has planted a bug under the saddle so to speak…. I don’t know how many parts will be in this series. In fact, I may add to it from time to time even after an initial series. This is intended as a “crash course” in the essentials of network security. It’s aimed at the home users and managers of small networks (small business owners?) that haven’t thought about network security before and maybe will be a reference of some value even to those that are more intermediate. The essentials of network security will be covered in the first few posts.
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More information on Titan Rain (“Hack attacks”)
Earlier this year there was an article or two about a rumored “hack attack” that was ongoing against US Government (and contractor) computer systems. The stories claimed that the attacks seemed to be coming from China. Today I’m seeing a couple of articles on the topic. First up is an AFP story on the problem it sounds as though little attention has been paid to hardening systems. There is speculation that the Chinese military is involved in the breakins. One incident was very neatly and methodically done, planting a backdoor in 30 minutes.
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Neat grep intro
Linuxgangster.org (??) has a good article up on the powerful grep command. GREP is one of the most useful command line tools in linux (really, there are so many it’s hard to choose, but this is one I use more frequently than most others…) grep can stand on it’s own to look for a term in many files (for example)
grep soughtafterterm *.txt
it will display which line numbers and which files it appears in.
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Tools of the trade…. External USB drive adapter
This is the first of a few articles that will highlight some of the tools/gadgets/gizmos that I find useful. I’m starting off with one that’s almost essential. External USB hard drive adapter. Recently, I’ve been looking for something a bit leaner than your typical usb -> hard drive converter. Yes, I’ve carried something like this for large (3.5″) hard drives to appointments. The idea is if you need to transfer data from an old pc to a new one, put the old drive in an external adapter and copy away.
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Global White Space Reset (CSS/html)
This may not be useful to many people, but I thought it was interesting. If you do web design and use css you’ll probably like this… I found this post at leftjustified.net about a neat way to “reset” the padding and margin css information which can help for designing sites to display the same when using CSS. Unfortunately, many browsers have little quirks in displaying css, maybe they have strange default settings which cause css placement to look, well, strange, from one browser to another… in comes this little trick…
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Frontier Labs – nexblack
I know it’s not an ipod… but I’m looking forward to hearing some word when Fronteir Labs releases their “Nexblack”. For background…. the nexblack is priced at around $89 (at the frontier labs store), but I’ve found $69 here. It’s a portable mp3/wma/wma with drm/ogg player (according to the spec sheet.) It uses AA batteries (2), has built-in recording, uses compactflash cards and according to the spec sheet will have a line-in (line-in recording as well). It also will have fm radio functions.
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How-to – NXserver on OpenSUSE
I’ve played around with NXserver before and been impressed with it’s speed (and quality) of remote X desktop over slow connections. It’s been about a year since I’ve actively looked at it, but I found this how-to yesterday from madpenguin. The how-to is related to getting nxserver up and running on OpenSuSE using freenx (a free version of NoMachine’s NX server).
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Wikipedia Class action suit?
ZDNet’s the Open Source blog is talking about a possible Classaction suit against the wikipedia. He calls it the next SCO suit and summarizes things like this…
The SCO suits were an attempt to shut down open source based on the idea that everything is owned, or comes from something that is owned, and so the use of any code requires payment to someone.
While that lawsuit is winding down, a new threat is now emerging. It’s a class action against Wikipedia, aimed at ending open source information by demanding that “someone take responsibility” for everything published on the Web.
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More Command Line Interface Magic…. Aliases
Enterprise Linux has a good article on some handy aliases under linux that can make CLI usage much more handy. The only warning I would have is to be careful that an alias you want to create doesn’t conflict with another useful program. (One of the comments noted that ld is the executable of the linker).