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

Configuring IMAP

Now that you're able to get e-mail delivered, you can read e-mail from the local mail spool by using the mail command. In general, it is more useful to be able to retrieve your e-mail from off the box however, which typically means webmail, pop3 or IMAP. In this recipe, we're going to look at setting up a Dovecot e-mail server.

How to do it...

  1. Install the dovecot-imap package:

    sudo apt-get install dovecot-imap
  2. Configure the SSL cert and key:

    sed 's|^ssl_cert .*|ssl_cert = </path/to/cert|g' /etc/dovecot/conf.d/10-ssl.conf
    sed 's|^ssl_key .*|ssl_key = </path/to/key|g' /etc/dovecot/conf.d/10-ssl.conf
  3. Configure the mail server to require TLS by editing /etc/dovecot/conf.d/10-master.conf and set port = 0 under inet_listener imap.

  4. Restart the service:

    service dovecot restart

How it works…

Ubuntu provides a number of different packages for Dovecot, which provide a number of different services like imap, pop3 and manage sieve (simplified e-mail filtering).

Ubuntu ships these with...