Convert a list of hostnames to a list of IP addresses

I had a client with a huge list of hostnames that they needed to convert to IP addresses so they could scan them. That’s common. I used to have a Windows batch file to convert a list of hostnames to a list of IP addresses, so I dug it out of my archives. This uses ping but isn’t like a ping sweep; they knew the machine names but their tool needed IPs.

I used the file to resolve lists of machines so I could load them into a centralized logging or vulnerability management system. This client had the same need and nobody there had a similar tool. So I shared mine with them. And I present it here so I won’t lose it again, and if you need it, you can use it too.

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MAC address filtering in DD-WRT

MAC address filtering in DD-WRT

I don’t recommend MAC address filtering–it stands for Media Access Control and has nothing to do with Apple computers–as a security measure. It’s too easy to bypass it. But if you want or need to do MAC address filtering in DD-WRT it’s easy to do.

And admittedly, even though MAC filtering won’t help your security, DD-WRT’s implementation of it lets you do some neat tricks that an off-the-shelf router can’t do–like forcing a device to use 5 GHz even if it wants to use 2.4 GHz.

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Decrease your Roku resolution to save bandwidth

Decrease your Roku resolution to save bandwidth

From time to time when I’m watching baseball on my Roku, I’ll get a lot of buffering and, in extreme cases, a message stating that I may have insufficient bandwidth. If you have the same problem, the best fix for this to to decrease your Roku’s playback resolution. Or if you’re subject to a data cap, decreasing your resolution helps you stay under that too. Here’s how to change your Roku resolution.

The picture will suffer, but I’d rather watch a lower quality picture than none at all. You may also need to resize your Internet connection, but you can do this trick immediately, and for free.

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How to size your Internet connection

So I understand ISPs are upselling connection speeds saying it’ll make Netflix work better. That’s a nice theory. But if you’re already over 10 megabits, there’s a decent chance your connection speed won’t do much for Netflix at all. Here’s how to size your Internet connection. Read more

Build the best, most secure wifi in your neighborhood

My neighbor asked me for advice on setting up wi-fi in his new house. I realized it’s been a while since I’ve written about wi-fi, and it’s never been cheaper or easier to blanket your house and yard with a good signal.

Blanketing your house and yard while remaining secure, though, is still important.

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Now that Microsoft is IBM, it needs to avoid IBM’s big mistake

Whether Microsoft likes it or not, it’s turned into IBM. The biggest difference I see is that when Microsoft makes a mistake, it catches up with them much faster than the same mistake did to IBM.

But IBM’s biggest mistake was its adamant refusal to compete with itself. And that’s what Microsoft is going to have to avoid. Like Computerworld says, Apple says if you don’t compete with yourself, someone else will. Read more

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