Author: Dave Farquhar

DD-WRT as an access point

Dave Farquhar DD-WRT, Servers and Networking , , , , ,

There’s an addition on the back of our house, probably added in the 1970s or 80s, where the wi-fi reception is exceptionally poor. Something about the walls makes it tricky, and I also suspect we get some interference from the neighbors behind us. I solved the problem with a cheap router running DD-WRT as an access point. Read more

How I upgraded a TP-Link TL-WR841N to DD-WRT

Dave Farquhar DD-WRT, security, Servers and Networking , , , , ,
How I upgraded a TP-Link TL-WR841N to DD-WRT

If you want a nice router or access point, you can do a lot worse than upgrading a TP-Link TL-WR841N to DD-WRT. The TL-WR841N is inexpensive and reliable, and DD-WRT runs well on it once you get the right build.

You can configure it to be a router, an access point, or a repeater, based on what you need. It usually costs $25 and sometimes you can find one on sale for $20 or even $15, so it’s a huge bargain. Even if you want 802.11ac speeds, a TL-WR841N makes a fantastic secondary access point to improve your connectivity.

Let’s get on with the upgrade. In the case of the TP-Link TL-WR841N (or TL-WR841ND, which uses the same build), it’s really easy–10 steps. Read more

How I fixed a Lionel RW transformer

Dave Farquhar Toy trains ,
How I fixed a Lionel RW transformer
Lionel RW
The Lionel RW transformer, produced from 1948 to 1954, is one of Lionel’s larger single-throttle transformers.

I had a Lionel RW transformer that I bought nearly 10 years ago, at one of my first estate sales. I’m sure I remember using it after I bought it, but it was far from in working order when I found it this time. The accessory posts all showed voltage, but the critical A and B posts showed zero volts when connected to the U post, no matter how I turned up the handle. So while the transformer could power accessories, I couldn’t run a train off it using the variable output.

And I was uncomfortable using it without knowing exactly why part of it wasn’t working.

Fixing turned out to be easy, however.

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Another day, another router backdoor

Dave Farquhar security , , , , , , ,

Bad news everyone: There’s a backdoor in Linksys and Netgear (and possibly other) routers. The exploit works on a weird port, so it’s not remotely exploitable, nor is someone going to drop it with some crafty Javascript like the recent D-Link backdoor, but it’s not out of the question at all for malware to do a pivot attack. Here’s how it would work: Once a computer is infected, it could attack the router and infect it too, so that once someone disinfects their computer, the router could re-infect the computer at a later date. A router is a great place to hide, because nobody looks at it, and they have ample storage on them to exploit..

What can you do about it? Read more

Beyond compliance: Maturity models

Dave Farquhar security , , , , , ,

A lot of organizations equate security with regulatory compliance–they figure out what the law requires them to do, then do precisely that.

Forward-thinking organizations don’t. They see security as a way to get and maintain a competitive advantage, and rather than measure themselves against regulations that are often nearly out of date by the time they’re approved, they measure themselves against a maturity model, which compares their practices with similar companies in similar lines of work so they can see how they measure up. Read more

Gene Kim on scheduled maintenance

Dave Farquhar security , , , , ,

The excellent book The Phoenix Project has a choice quote that stuck with me.

In this scenario, the Yoda-like character asks the hero to imagine a company that makes deliveries. If the trucks break down, the deliveries stop, right? So you change the oil, since not changing the oil causes trucks to break down.

“Metaphors like oil changes help people make that connection. Preventative oil changes and maintenance policies are like preventative vendor patches and change management policies. By showing how IT risks jeopardize business performance measures, you can start making better business decisions.”

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My $30 desktop PC upgrade

Dave Farquhar Hardware , ,

I built my main desktop PC three and a half years ago and have no complaints about it, save one. Hard to believe, but PC hardware has improved considerably in recent years. This weekend, I sunk $30 into it to solve my single complaint, and now I can reasonably expect to get another three years out of it, if not longer.

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How to paint model railroad scenery

Dave Farquhar Toy trains , ,

When it comes to model railroad scenery, you tend to see two extremes–a plywood board painted a solid color of green, or an attempt (with varying success) at detailed scenery using ground foam and other materials, such as those sold by Woodland Scenics, at a price.

What if you want something in between? Well, on the Facebook Marx page, I saw a brilliant idea: sponge painting. The results looked really good, especially given the cost and effort required.

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Cutting through the fluff around the Target PIN breach

Dave Farquhar security , , , , , , ,

OK, so Target is back in the news, and it’s nowhere nearly as bad this time but there’s some posturing and some fluff in the news, so I’ll take it upon myself to demystify some of it. Some of it’s PR fluff, and some of it’s highly technical, so I’ll cut through it.

I’m just glad–I guess–to be talking about this stuff outside of a job interview. Like I said, this time the news isn’t nearly as bad as it could be. Read more

Those marketers targetted the wrong guy

Dave Farquhar Uncategorized ,

So, I’ve been seeing one particular ad incessantly lately. It’s a fairly generic-looking ad, with the words “Jesus Christ is Lord” in bold letters across the top. Scroll down a little further, and there’s a very heavily tanned woman, under a thick layer of makeup wearing a skimpy halter top. She’s probably in her early 20s. It’s an ad for a certain Christian-themed dating web site I won’t mention by name.

It seems to be targeted advertising. Fine, my religion is no great secret. Most public databases that I’ve queried about myself identify me as a Protestant, and some even peg me as Lutheran too. But there’s this one other little detail that’s even easier to find out than what religion I practice.

I happen to be married. Read more