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

Granting authenticated access

Samba supports granting authenticated access to shares in addition to making them available as public shares.

How to do it…

  1. Select the account that you want to use for authentication. All Samba share accounts must be accompanied by a Unix account. In this case, we'll user a new user called testuser:

    sudo useradd testuser
  2. Create a separate Samba-specific password for that account:

    sudo smbpasswd –a testuser
  3. Modify smb.conf to set the valid users for the share:

      path = /home/share
      guest ok = yes
      read only = yes
       valid users = testuser
  4. Access the share once again; confirming that this time, you are prompted for a username and password.

How it works…

As mentioned in the preceding, Samba users must be backed by a system user account that is known to PAM. This could mean a user in /etc/passwd, or it could mean a user account coming from some sort of directory service. In this case, we are going to create a dedicated user account.

Authentication however is...