One of the first tasks that should be accomplished when deploying a new server (and in reality, any new machine) is setting up a software firewall. On a Linux computer, this is accomplished using iptables. We can use the /sbin/iptables command to manipulate our firewall, or we can directly edit the /etc/sysconfig/iptables file. Each has […]
I recently showed everyone how to install a new CentOS server, and now that we have a running system, we need to do some basic configuration to SSH to make sure our server is secure. When you install your operating system, you should have created an initial root password. We will use this to log […]
The last available IPv4 addresses have been allocated, which means we all need to start learning about and using IPv6! IP addresses are a set of numbers that uniquely identify a host on the internet. IPv4 addresses are composed of four separate 8-bit numbers (for a total of 32 bits), from 0-255, written as 111.222.33.44. […]