7COM1029 Network System Administration: Linux Services Configuration

This report proposes and implements a network design utilizing Linux network services to enhance organizational functionality. It details the installation and configuration of essential services such as DNS and DHCP servers, SSH securing, real and virtual host setups, and iptables firewall configuration. The report includes experimental work, analysis, and testing to evaluate the performance of the proposed network services, verifying the functionality of virtual hosts. It concludes by confirming the successful implementation and operation of the configured network environment.

600
NETWORK SYSTEM
ADMINISTRATION

Abstract
A network design for the existing system is proposed and implemented using the Linux
network services. The objective includes to improve organizational services’ functionality
and behaviour. It gives a details steps to install and configure the necessary network services
such as DNS and DHCP server, SSH securing, installation of real and virtual hosts, and
firewall configuration of iptables. Moving on the report tests and assesses the proposed
network services. The report concludes by determining the working of the virtual hosts.

Table of Contents
1. Introduction.......................................................................................................................1
2. Literature Review.............................................................................................................1
3. Project Scope & Limitations............................................................................................1
4. Proposed Network Design................................................................................................2
5. Experimental Work & Analysis......................................................................................2
5.1 Installation and Configuration of DHCP Server....................................................2
5.2 DNS Server in Virtual Machine...............................................................................7
5.3 Real &Virtual Hosts Set-up....................................................................................18
5.4 Client/Server Configuration and Interactions......................................................25
5.5 Implementing Quality of Service (QoS)................................................................28
5.6 Securing SSH...........................................................................................................29
5.7 iptables......................................................................................................................34
6. Testing and Evaluation...................................................................................................36
7. Conclusion.......................................................................................................................39
References...............................................................................................................................40

1. Introduction
A network design is proposed in this report for the existing system. The purpose is to
implement the Linux network services. The aim is to improve the functionality and behaviour
of the organizational services. The proposed network requires installation and configuration
of the network services such as DNS and DHCP server, SSH securing, real and virtual hosts,
and iptables.
Background
As the network service is a combination of network functions, with unique behavior it
boosts the network’s capability. With the boom of technology the businesses are equipping
with effective measures for meeting their business requirements, such as improving the
network services, as it supports enhancement of business.
2. Literature Review
According to Scott and Laws (2010), the service industries consider networks as a
major are of study, which are the basic features of services. The service provides mainly rely
on other’s suggestion of directing their customers to a specific business; and it is difficult to
gain knowledge about the competitors and customers, which requires information exchange
via knowledge networks. The services keep fluctuating and the demand cannot be dealt
easily. The services need people to engage in business production, and results in increased
amount of small companies in the service industries, as volume increasing is highly complex
when people are involved. Therefore, due to these reasons networks service are essential.
3. Project Scope & Limitations
The scope of this project is to improve the functionality and behaviour of the
organizational services.
The limitations are:
 Needs risk security.
 Needs highly expensive set-up.
 Needs professional assistance.
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4. Proposed Network Design
Figure 1: Network design proposed for the existing network
The below listed network services need to be updated and configured:
 DHCP server
 DNS server
 Real and virtual hosts
 Client/server
 SSH securing
 iptables firewall
5. Experimental Work & Analysis
Ubuntu is used to examine the current the network system services.
5.1 Installation and Configuration of DHCP Server
Use the command shown below to install DHCP server in Linux system (Grant,
2010):
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Restart DHCP Server
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Use the command shown below and Type open DHCP configuration file:
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Use the command shown below to make changes in the DHCP configuration file.
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Then, in DCHP configuration add the net mask address.
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Use the command shown below to start DHCP server, followed by checking the IP address.
DHCP working conditions are checked with the help of nslookup method, where the below
given steps need to be followed:
Therefore, the DHCP server has been installed successfully in Linux system.
5.2 DNS Server in Virtual Machine
Steps to Install DNS server
Begin with the updating of Ubuntu virtual machine, followed by the required
installation.
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Use the below shown screenshots to configure DNS server.
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Steps to Configure Primary DNS Server
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