Authinfo for .de domains

Since december 2008, the DENIC provides an authinfo for domain transfers. This method is known from a lot top level domains. Befor december, the DENIC provided an asynchronous transfer method, which doesn’t need an authinfo.
Firstly, the registration agency allows to use both methods parallel. But the authinfo method is much more secure. It decreases the [...]

Changing ssh port to improve security

For security reasons, it’s advisable to change the ssh standard port 22 into something else. So you will get less attacks to sshd. This improves the security for your server. Furthermore, you should block root from connecting via ssh.
Open your /etc/ssh/sshd_config
Changing the port:

# This is the sshd server system-wide configuration file. See sshd(8)
# for [...]

Scripting a firewall with iptables

IPTables is a text based frontend for the ipchains kernel module. The ipchains support is compiled into most kernels of todays distributions. With iptables you don’t have to use a graphical tool. So it’s very suitable for scritpting.
First thing to do is installing neccessary packages, for Ubuntu / Debian:
apt-get update
apt-get install iptables
When the package is [...]