Marcelo Toledo Blog

startups, empreendedorismo e tecnologia

Mobile Hotspot – Wi-Fi in your car, bus, taxi cab, …

Today we launched our first pilot of the VexBox Mobile Hotspot solution. It’s our linux distribution with a new hardware that can take the internet from 3.5G, 3G, EDGE or GPRS, whatever is available and faster. It can be used in places where fiber doesn’t reach or buses, taxi cabs, cars, … It’s been months doing reverse engineering to understand how the hardware works, also writing the device drivers for a chip that is not perfectly designed and well, we made it! October 1st is the official launch date. Congratulations for all the team, I know you all worked very…

What actually 802.11r do?

After 4 years of hard working, IEEE approved the standard 802.11r, which handles a fast BSS transition. What this means? A big wireless network, is built with a lot of access points, this means that if you would like to cover a big city, you might have thousands of access points spreaded around. This brought a new challenge to 802.11, with the introduction of applications such as voip, the transition between access points needs a very small delay, you would be amazing how annoying is to have a delay bigger then 300ms, can turn your call into something unacceptable if…

How to NOT apply for a job

Two days ago I posted a job opportunity in one of those sites where engineers and computer professionals watch often, I described the company and the profile I was looking for very carefully, in the end of the profile I made one simple request: Include your salary expectation I did it in the late evening and early in the morning it was already appearing in the website and I already received a bunch of applications. Checking one by one, I noted that most of the applications didn’t do the simple request, like usual. How experienced people don’t realize this can…

Hacking commercial wireless

Lately a number of blogs posted comments on a very old post, dated 2006 about how to hack a commercial wireless, goes like this: “I continued to try a couple other things, like checking if they eventually forgot some ports like 21 (ftp) or 110 (pop3). But no, all of them were properly blocked. After a lot of unsuccesfull attempts, I had some intuition telling me to check how they handle pictures. Without any hope of success I typed http://www.google.com/.jpg into my browser’s adress bar, and to my big surprise I saw the page you see when you follow the…

Canada blocks outgoing email

Few weeks ago I was in Vancouver for a few meetings, while in this company that produces routers, they told me that they also offer a mail service that can come within the router, making absolute non-sense for me, I asked: Q: “why?” A: “Most ISPs in Canada blocks port 25″ *sigh* Q: “Why?” A: “They think this way they will block spam” *sigh* It’s incredible how from time to time you can hear incredible ideas like this, how come no one ever realized that blocking port 25 would reduce spam, uh? Because of this fantastic solution this company has…

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