Why MAC address filtering doesn’t help security

The other question that came out of my recommended DD-WRT settings was why not filter MAC addresses. I hate to be flip, but MAC address filtering doesn’t help, so why bother?

The reason is because your MAC addresses are broadcast as part of the network traffic, and it’s unencrypted. So your MAC addresses aren’t any secret at all. So it doesn’t do any good. One could argue it doesn’t do any harm. But it adds an extra step every time you put something on your wireless network. Why go to the inconvenience if you don’t gain anything from it?

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Why hiding your SSID makes your security worse

I got a couple of questions about my recommended DD-WRT settings, but I’m going to start with the question about why not to hide the SSID. It actually turns out that hiding your SSID is bad for you, and makes your security worse. I’ll explain.

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Recommended DD-WRT settings

I’ve been asked a few times now for my recommended DD-WRT settings, or at least my good-enough settings. I think that’s a great idea, so I’ll walk through how I configure a DD-WRT router. Follow these steps and I can almost guarantee you’ll have the most secure network on your block.

For the purposes of this tutorial, I am going to assume you are configuring DD-WRT as your primary router.

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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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How to use the lock in your web browser’s location bar

How to use the lock in your web browser’s location bar

A commenter asked me last week if I really believe the lock in a web browser means something.

I’ve configured and tested and reviewed hundreds of web servers over the years, so I certainly hope it does. I spend a lot more time looking at these connections from the server side, but it means I understand what I’m seeing when I look at it from the web browser too.

So here’s how to use it to verify your web connections are secure, if you want to go beyond the lock-good, broken-lock-bad mantra.

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Cutting through the fluff around the Target PIN breach

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

Hostsman makes it easy to block malware with a hosts file

I’ve written before about using the hosts file to block domains that are hosting malware. The idea is pretty simple. There’s a known list of domains that are either hosting or controlling malware, so by blocking your computer from accessing those domains, you make it much harder to get infected in the first place, and in the event that you do get infected, at least you block access to the command and control servers.

The problem is that Windows doesn’t make this easy. Well, I found an easy way: Hostsman. You can have it up and running in minutes.

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Upgrading a D-Link DIR-615 to DD-WRT

Last year I bought my mother in law a D-Link router, an oddball DIR-615 revision E1 that was only sold at a few stores. It was supposed to be a Fry’s exclusive, but I bought hers at Micro Center. It worked for a while, then gave her trouble, so this year I was working with it again, and when I was setting it up, I noticed it had some security vulnerabilities–remote code execution, UPnP vulnerabilities, and who knows what else.  So that got me some practice upgrading a D-Link DIR-615 to DD-WRT.

DD-WRT’s track record and attitude towards security research could be better, but I’d rather trust my mother in law to DD-WRT’s B+ security than D-Link’s F.

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