Centos

If you need to backup your network device's (you know Cisco, HP etc) running configuration, one of the most common ways to do this is via a TFTP server. There are various tftp solutions out there and this guide covers setting up a centos box on how to become a tftp server. There a few guides out there already but this one covers Centos 5 Linux specifically.

Step 1.
You need to install the tftp-server service and the xinetd service software using yum.
The xinetd service is required as this controls the tftp server daemon.

Using the plug-in modular nature of PAM we can get a linux server to use RADIUS to authenticate users connecting via SSH. This guide tells you how to setup a Centos 5.2 server as your Radius "client" and Juniper Steel-Belted as your radius server authentication "server". We are going to use the pam_radius_module from free radius to provide the mechanism of authenticating ssh logins against a radius box.

For this example my environment consists of

A centos 5.2 radius client called "cyclone"
A Steel-Belted Radius server is called "turbo"
A username of dave