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Home > Cloud & Networking > Networking > Linux Networking Cookbook
Linux Networking Cookbook
Linux Networking Cookbook

Linux Networking Cookbook: Over 40 recipes to help you set up and configure Linux networks

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Profile Icon Dsouza Profile Icon Gregory Boyce
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eBook Jun 2016 152 pages 1st Edition
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Linux Networking Cookbook

Chapter 2. Configuring DNS

In this chapter, we will cover:

  • Setting up your system to talk to a nameserver
  • Setting up a local recursive resolver
  • Configuring dynamic DNS on your local network
  • Setting up a nameserver for your public domain
  • Setting up a slave nameservers

Introduction

This chapter introduces the Domain Name System (DNS). You'll learn what DNS is, how it works, and how to configure it to work according to your requirements. We'll start by configuring your machines to be able to resolve hostnames, such as www.google.com and we'll work toward learning to configure your own domain.

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:
    nameserver 8.8.8.8
  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 example.org in resolv.conf will allow you to ping mail.example.org as just mail.

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

Setting up a local recursive resolver

Since all attempts to access a website require that you look up the hostname, the responsiveness of your nameserver can have a large impact on the loading of a webpage. A slow nameserver can delay the initial loading of the webpage as well as the loading of the various embedded images, video, and JavaScript, which might have been pulled third-party sites.

In this section, we'll be looking at setting up our own recursive nameserver, which will help cut down on the round trips between you and your resolver. We will additionally configure it to forward uncached queries to a public recursive nameserver in order to take advantage of their caching.

How to do it…

Let's set up the local recursive resolver:

  1. Install bind9 on Ubuntu; this can be done with sudo apt-get install bind9. On Red Hat and CentOS, it can be done with yum install bind instead. For other distributions, consult the relevant documentation.
  2. Add an allow-recursion entry in the options...

Configuring dynamic DNS on your local network

Right now you get your IP address configured automatically via DHCP and you're able to resolve DNS records from the internet via your DNS server. With the use of Dynamic DNS, you can also leverage your DNS server to address your local systems by name as well.

How to do it…

Let's configure dynamic DNS on your local network:

  1. First, we need to configure your bind instance to host DNS for your internal domain, as well as reverse DNS for your IP range. For our example, we'll use a domain of example.org:
    zone "example.org" {         
  type master;
  notify no; 
  file "/var/lib/bind/example.org.db";
}
zone "0.168.192.in-addr.arpa" {      
  type master;
  notify no; 
  file "/var/lib/bind/rev.1.168.192.in-addr.arpa"; 
};
  2. Next we populate the zone in example.org.db:
    example.org.  IN  SOA  router.example.org. admin.example.org. (
  2015081401
  28800
  3600
  604800 
  38400
)  
example.org. ...

Setting up a nameserver for your public domain

Setting up a nameserver for a public domain works the same way as setting up a DNS server for an internal hostname, just with a few additional parts that we'll want to make sure are in a good state.

How to do it...

Let's set up a nameserver for a public domain:

  1. Set up a properly configured SOA record:
    example.org.  IN  SOA  ns1.example.org. admin.example.org. (
 2015081401
 28800
 3600
 604800 
 38400
)
  2. Set up a record for NS hosts:
    Ns1    IN      A       192.168.1.1
  3. Set up glue records:
    $ORIGIN example.org
       IN      NS      ns1.example.org.
Ns1    IN      A       192.168.1.1

How it works…

The first step is to configure the start of authority (SOA) for your domain. The SOA provides basic information about the zone itself. It contains a number of fields, including:

  • Example.org: The zone.
  • IN: Class of the record. IN is Internet, which you'll see for the majority of DNS records that you see.
  • SOA: Start of authority.
  • ns1.example.org...

Introduction

This chapter introduces the Domain Name System (DNS). You'll learn what DNS is, how it works, and how to configure it to work according to your requirements. We'll start by configuring your machines to be able to resolve hostnames, such as www.google.com and we'll work toward learning to configure your own domain.

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Page 1 of 7

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Key benefits

  • Move beyond the basics of how a Linux machine works and gain a better understanding of Linux networks and their configuration
  • Impress your peers by setting up and configuring a Linux server and its various network elements like a pro
  • This is a hands-on solution guide to building, maintaining, and securing a network using Linux

Description

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.

Who is this book for?

This book is targeted at Linux systems administrators who have a good basic understanding and some prior experience of how a Linux machine operates, but want to better understand how various network services function, how to set them up, and how to secure them. You should be familiar with how to set up a Linux server and how to install additional software on them.

What you will learn

  • Route an IPv6 netblock to your local network
  • Modify your named instance to support setting hostnames for your IPv6 addresses
  • Use SSH for remote console access
  • Configure NGINX with TLS
  • Secure XMPP with TLS
  • Leverage iptables6 to firewall your IPv6 traffic
  • • Configure Samba as an Active Directory compatible directory service

Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : Jun 28, 2016
Length: 152 pages
Edition : 1st
Language : English
ISBN-13 : 9781785285974
Category :
Cloud & Networking
Concepts :
Networking
Tools :
Ubuntu Server

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Publication date : Jun 28, 2016
Length: 152 pages
Edition : 1st
Language : English
ISBN-13 : 9781785285974
Category :
Cloud & Networking
Concepts :
Networking
Tools :
Ubuntu Server

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Table of Contents

13 Chapters
1. Configuring a Router Chevron down icon Chevron up icon
1. Configuring a Router
Introduction
Setting up the physical network
Configuring IPv4
Configuring IPv4 permanently
Connecting two networks
Enabling NAT to the outside
Setting up DHCP
Setting up a firewall with IPtables
Setting up port forwarding
Adding VLAN Tagging
2. Configuring DNS Chevron down icon Chevron up icon
2. Configuring DNS
Introduction
Setting up your system to talk to a nameserver
Setting up a local recursive resolver
Configuring dynamic DNS on your local network
Setting up a nameserver for your public domain
Setting up a slave nameserver
3. Configuring IPv6 Chevron down icon Chevron up icon
3. Configuring IPv6
Introduction
Setting up an IPv6 tunnel via Hurricane Electric
Using ip6tables to firewall your IPv6 traffic
Route an IPv6 netblock to your local network
4. Remote Access Chevron down icon Chevron up icon
4. Remote Access
Introduction
Installing OpenSSH
Using OpenSSH as a basic shell client
Using OpenSSH to forward defined ports
Using OpenSSH as a SOCKS proxy
Using OpenVPN
5. Web Servers Chevron down icon Chevron up icon
5. Web Servers
Introduction
Configuring Apache with TLS
Improving scaling with the Worker MPM
Setting up PHP using an Apache module
Securing your web applications using mod_security
Configuring NGINX with TLS
Setting up PHP in NGINX with FastCGI
6. Directory Services Chevron down icon Chevron up icon
6. Directory Services
Introduction
Configuring Samba as an Active Directory compatible directory service
Joining a Linux box to the domain
7. Setting up File Storage Chevron down icon Chevron up icon
7. Setting up File Storage
Introduction
Serving files with SMB/CIFS through Samba
Granting authenticated access
Setting up an NFS server
Configuring WebDAV through Apache
8. Setting up E-mail Chevron down icon Chevron up icon
8. Setting up E-mail
Introduction
Configuring Postfix to send and receive e-mail
Setting up DNS records for e-mail delivery
Configuring IMAP
Configuring authentication for outbound e-mail
Configuring Postfix to support TLS
Blocking spam with Greylisting
Filtering spam with SpamAssassin
9. Configuring XMPP Chevron down icon Chevron up icon
9. Configuring XMPP
Introduction
Installing ejabberd
Configuring DNS for XMPP
Configuring the Pidgin client
10. Monitoring Your Network Chevron down icon Chevron up icon
10. Monitoring Your Network
Introduction
Installing Nagios
Adding Nagios users
Adding Nagios hosts
Monitoring services
Defining commands
Monitoring via NRPE
Monitoring via SNMP
11. Mapping Your Network Chevron down icon Chevron up icon
11. Mapping Your Network
Introduction
Detecting systems on your network with NMAP
Detecting Systems Using Arp-Scan
Scanning TCP ports
Scanning UDP ports
Identifying services
Identifying operating systems
12. Watching Your Network Chevron down icon Chevron up icon
12. Watching Your Network
Introduction
Setting up centralized logging
Installing a Snort IDS
Managing your Snort rules
Managing Snort logging
Index Chevron down icon Chevron up icon
Index

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Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
(3 Ratings)
5 star 66.7%
4 star 0%
3 star 0%
2 star 33.3%
1 star 0%
Thomas Jul 28, 2024
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Lots of tips
Subscriber review Packt
Chris Lewis Nov 27, 2023
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This fixed Samba issues that I have been having forever. It gave me an 'in' to building a router, a project I have been bouncing off several times. Short, to the point, with brief explaners, follow every recipe and you will go from 'whaaa.. ..?' to 'aww yeah!'
Feefo Verified review Feefo
Just a guy with a job Apr 23, 2018
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
Sadly, rather shallow.
Amazon Verified review Amazon

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About the authors

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Profile icon Dsouza
Dsouza
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Profile icon Gregory Boyce
Gregory Boyce
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Gregory Boyce is a technologist with nearly 20 years' experience using and managing Linux systems. When he's not at work or spending time with his wife and two daughters, he plays around with new technologies. Gregory has spent the last 15 years working at Akamai Technologies, where he has worked in roles ranging from Network Operations, Internal IT, Information Security, Software Testing, and Professional Services. Currently, he heads up the Linux OS team that manages Akamai's custom Linux operating system, which runs on their massively distributed customer-facing network.
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