The Silicon Underground https://dfarq.homeip.net David L. Farquhar, computer security professional, train hobbyist, and landlord Wed, 27 Oct 2021 14:23:00 +0000 en-US hourly 1 https://i2.wp.com/dfarq.homeip.net/wp-content/uploads/2018/11/cropped-silicon-underground.jpg?fit=32%2C32&ssl=1 The Silicon Underground https://dfarq.homeip.net 32 32 16321610 Private vs public IP address https://dfarq.homeip.net/private-vs-public-ip-address/?utm_source=rss&utm_medium=rss&utm_campaign=private-vs-public-ip-address https://dfarq.homeip.net/private-vs-public-ip-address/#respond Thu, 28 Oct 2021 13:03:26 +0000 https://dfarq.homeip.net/?p=26979 It is important to know how to distinguish between a private vs public IP address. IT professionals and security professionals frequently have to work with them, and it is a very common job interview question, and certification question. Here are the ranges of private IP addresses, and why we need them. In the early days… Read More »Private vs public IP address

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How to tell what motherboard you have https://dfarq.homeip.net/how-to-tell-what-motherboard-you-have/?utm_source=rss&utm_medium=rss&utm_campaign=how-to-tell-what-motherboard-you-have https://dfarq.homeip.net/how-to-tell-what-motherboard-you-have/#respond Wed, 27 Oct 2021 13:03:04 +0000 https://dfarq.homeip.net/?p=26993 Your motherboard determines how much you can upgrade your PC. It also determines what upgrades will and won’t work in your PC. Here’s how to tell what motherboard you have, possibly without even opening your computer. You can check which motherboard you have by running a WMI command in Windows, dmidecode in Linux, or looking… Read More »How to tell what motherboard you have

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What is denatured alcohol? https://dfarq.homeip.net/what-is-denatured-alcohol/?utm_source=rss&utm_medium=rss&utm_campaign=what-is-denatured-alcohol https://dfarq.homeip.net/what-is-denatured-alcohol/#comments Tue, 26 Oct 2021 13:03:49 +0000 https://dfarq.homeip.net/?p=26970 Hardware stores sell denatured alcohol as a cleaner, a fuel, or a solvent. What does denatured mean? What’s the difference between denatured and other alcohol, such as what you find at a drug store, or the liquor store? Denatured alcohol is ethanol, sometimes as little as 50 percent by volume, mixed with other chemicals to… Read More »What is denatured alcohol?

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What WHIP is in baseball https://dfarq.homeip.net/what-whip-is-in-baseball/?utm_source=rss&utm_medium=rss&utm_campaign=what-whip-is-in-baseball https://dfarq.homeip.net/what-whip-is-in-baseball/#respond Mon, 25 Oct 2021 13:03:38 +0000 https://dfarq.homeip.net/?p=26901 WHIP is my all-time favorite baseball statistic. I’ll get into why in a bit. What WHIP measures is how many base runners a pitcher allows in an average inning. It’s a pretty easy way to calculate a pitcher’s effectiveness. What elite pitchers in baseball have in common: low WHIP I independently discovered WHIP playing computer… Read More »What WHIP is in baseball

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Is data privacy important? https://dfarq.homeip.net/is-data-privacy-important/?utm_source=rss&utm_medium=rss&utm_campaign=is-data-privacy-important https://dfarq.homeip.net/is-data-privacy-important/#comments Thu, 21 Oct 2021 13:03:52 +0000 https://dfarq.homeip.net/?p=26441 I hear the argument all the time that if you aren’t doing anything wrong, you don’t have to worry about privacy. So is data privacy important? I’ll tell you why it is. There was a very vocal element of society that was very anti-data privacy until 2021. Once the COVID vaccine was released, suddenly they… Read More »Is data privacy important?

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Recommended operating systems for vintage PCs https://dfarq.homeip.net/recommended-operating-systems-for-vintage-pcs/?utm_source=rss&utm_medium=rss&utm_campaign=recommended-operating-systems-for-vintage-pcs https://dfarq.homeip.net/recommended-operating-systems-for-vintage-pcs/#comments Wed, 20 Oct 2021 13:00:33 +0000 https://dfarq.homeip.net/?p=26697 I was watching a YouTube video where someone was talking about his new acquisition, and he commented that he thought the operating system might be too new for that PC. So I thought maybe a list of recommended operating systems for vintage PCs might be helpful. A definitive guide to the sort of thing would… Read More »Recommended operating systems for vintage PCs

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What whitewood is at Home Depot or Lowe’s https://dfarq.homeip.net/what-whitewood-is-at-home-depot-or-lowes/?utm_source=rss&utm_medium=rss&utm_campaign=what-whitewood-is-at-home-depot-or-lowes https://dfarq.homeip.net/what-whitewood-is-at-home-depot-or-lowes/#respond Tue, 19 Oct 2021 13:03:36 +0000 https://dfarq.homeip.net/?p=26912 If you shop at Home Depot or Lowe’s, and possibly other home improvement stores, you will hear or see the phrase whitewood. What is whitewood at Home Depot and what does it mean? What is whitewood made of? Whitewood is a generic term that Home Depot, Lowe’s, and other US home improvement stores use for… Read More »What whitewood is at Home Depot or Lowe’s

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Why Nolan Ryan never won a Cy Young Award https://dfarq.homeip.net/why-nolan-ryan-never-won-a-cy-young-award/?utm_source=rss&utm_medium=rss&utm_campaign=why-nolan-ryan-never-won-a-cy-young-award https://dfarq.homeip.net/why-nolan-ryan-never-won-a-cy-young-award/#comments Mon, 18 Oct 2021 13:03:15 +0000 https://dfarq.homeip.net/?p=26895 If you want to sound like you know baseball, one of the fun facts you can drop is that Nolan Ryan never won a Cy Young award. He was so good for so long, that sounds astounding. But if you look it up, it’s true. Here’s why Nolan Ryan never won a Cy Young award.… Read More »Why Nolan Ryan never won a Cy Young Award

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What is period correctness? https://dfarq.homeip.net/what-is-period-correctness/?utm_source=rss&utm_medium=rss&utm_campaign=what-is-period-correctness https://dfarq.homeip.net/what-is-period-correctness/#comments Thu, 14 Oct 2021 12:00:45 +0000 https://dfarq.homeip.net/?p=26632 When talking about retro computers or any other collectible, sometimes you’re run into the term period correctness. What does it mean? Period correctness is simply a term that means correct for the era. It means that an accessory or add-on came from the same era as the item you are using with, and the two… Read More »What is period correctness?

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Fix wp-cron.php to improve WordPress speed and reliability https://dfarq.homeip.net/fix-wp-cron-php-to-improve-wordpress-speed-and-reliability/?utm_source=rss&utm_medium=rss&utm_campaign=fix-wp-cron-php-to-improve-wordpress-speed-and-reliability https://dfarq.homeip.net/fix-wp-cron-php-to-improve-wordpress-speed-and-reliability/#respond Wed, 13 Oct 2021 13:03:57 +0000 https://dfarq.homeip.net/?p=26813 My WordPress has been acting strange for a while, missing scheduled posts and other general weirdness. I eventually traced the problem to a file called wp-cron.php. Here’s how I automated wp-cron.php to improve WordPress speed and reliability. Note: My fix involves running commands directly. If you don’t have shell access to your server, you’ll need… Read More »Fix wp-cron.php to improve WordPress speed and reliability

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