Carlos M. Martinez-Cagnazzo

Este trabajo fue aceptado para su publicacion en el Congreso Ibero Americano de Seguridad Informática (CIBSI) edición 2009. Mas información acerca del mismo puede encontrarse en su sitio web.

My laptop's x64 Win Vista Driver Store got corrupted yesterday, after a CHKDSK was performed on the C: drive. How did I realize this? Because I tried to install a printer and got bizarre errors and an empty driver list (where Windows will usually list tons of drivers)

I followed the steps mentioned in this post, and the basically worked, now I can see the full list of printer drivers. In short, the steps are:

I use "Unison" regularly as a folder synchronization tool. As much as I have searched, I have yet to find something that comes even close to it as a sync tool. However, Unison has its dark side as well. Unison, defying all reason, is not backward compatible with itself, and worse, has no fallback mechanisms built-in.

Yesterday I was in need of detecting when a web site or page is accessed via either IPv6 or IPv4. I wrote two rather simplistic PHP functions that so far seem to be up to the job. They just look for an ocurrence of the symbol ":" in the "REMOTE_ADDR" server variable. Here they are:

If you are like me, chances are that you could not resist the urge to download and install Microsoft's public beta of the upcoming Windows 7 release.

So, I did install it at the expense of having my Fedora 10 GRUB overwritten by Windows 7's installer. Although W7 works fine now, I lost the ability to boot into FC10.

I booted the laptop using my FC 10 LiveCD and tried to do the mount root / chroot / grub-install routine that is described everywhere in the Internet, but I found that the chrooted system has no devices under /dev and this makes grub-install fail.

6to4 es uno de los varios mecanismos de transicion de IPv4 a IPv6 que han sido propuestos por el IETF. Es un mecanismo de tunelizacion de IPv6 en un payload IPv4 con la caracteristica adicional de que el extremo remoto del tunel puede congurarse automaticamente ya que usa una direccion well-known como extremo remoto. Es facil de congurar y tiene buena performance. Sin embargo, presenta algunos desafíos a la hora de poderlo utilizar de manera estable detras de un NAT con IP publica variable, como es el caso de la inmensa mayoria de servicios ADSL hogarenos.

I've been running some OpenBSD guests on a Linux VmWare Server host with great success. Performance is great since OpenBSD is a light system packed with all the features you might need and VmWare Server does a great job virtualizing even this unsupported platform.