My Side Notes

I downloaded an .rpm package but if I run # rpm -ivh xxx.rpm It shows a long list of dependences needed to install. If I run yum install xxx.rpm I’ve got an error message Package xxx.rpm is not signed Solution: Edit /etc/yum.conf replace gpgcheck=1 to gpgcheck=0

This is the way I successfully fight spam using Postfix and Real-time Block Lists. I used to use Sendmail with RBLs but a couple of years ago switched all my servers to Postfix since I found the latter easier to configure. Add the fillowng lines to your Postfix main.cf file (on Linux usually at /etc/postfix/main.cf): [...]

Here is a quick guide how to enable VLANs on Ubuntu or Debian box. VLANs on Linux will work with the most of the modern ethernet adapters. Frankly speaking I have not came across of adapter it would not work with. I presume that you use standard kernel shipped with Ubuntu. However, if you use [...]