Book Image

Linux Networking Cookbook

By : Agnello Dsouza, Gregory Boyce
5 (1)
Book Image

Linux Networking Cookbook

5 (1)
By: Agnello Dsouza, Gregory Boyce

Overview of this book

Linux can be configured as a networked workstation, a DNS server, a mail server, a firewall, a gateway router, and many other things. These are all part of administration tasks, hence network administration is one of the main tasks of Linux system administration. By knowing how to configure system network interfaces in a reliable and optimal manner, Linux administrators can deploy and configure several network services including file, web, mail, and servers while working in large enterprise environments. Starting with a simple Linux router that passes traffic between two private networks, you will see how to enable NAT on the router in order to allow Internet access from the network, and will also enable DHCP on the network to ease configuration of client systems. You will then move on to configuring your own DNS server on your local network using bind9 and tying it into your DHCP server to allow automatic configuration of local hostnames. You will then future enable your network by setting up IPv6 via tunnel providers. Moving on, we’ll configure Samba to centralize authentication for your network services; we will also configure Linux client to leverage it for authentication, and set up a RADIUS server that uses the directory server for authentication. Toward the end, you will have a network with a number of services running on it, and will implement monitoring in order to detect problems as they occur.
Table of Contents (19 chapters)
Linux Networking Cookbook
About the Author
About the Reviewer

Setting up your system to talk to a nameserver

In the previous chapter, we did some basic testing of your network connection by pinging other hosts by IP address directly. However, I'm sure you'd rather not visit web pages by requesting them by IP address, rather than by the domain name. This problem is solved using a recursive DNS server to resolve the hostnames into IP addresses, which your computer can then connect to.

How to do it…

Let's set up a DNS server to resolve the hostnames into IP addresses:

  1. Configuring Linux to use a DNS server is very easy. Just add a single line to /etc/resolv.conf:

  2. You may also want to add a domain line, which will allow you to access things by their hostname rather than by their fully qualified domain name (FQDN). For example, domain in resolv.conf will allow you to ping as just mail.

If your system uses DHCP for receiving its IP address, then the content of this file can be managed through the configuration of...