telnet remote desktop (1)

8/20/2019 Telnet Remote Desktop (1)

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NPOL LAB: Telnet & Remote Desktop 1

Telnet & Remote Desktop

A. Creating a User Account

In this exercise, you will create a user account with a password. The user account name will be

your first name and the password will be ist220.

1. To open User Accounts, go to Start →Settings → Control Panel → User Accounts.

2. Click Create a new user account.

3. Assign Your First Name (No space in the username) as the user name, then click

Next.

4. Select the account type as Limited.

5. Click Create to create the account.

6. Double click on the account that you just created.

7. Click Create a password.

8. Set the password as “ist220”.

B. Telnet

In this exercise, you will activate the TELNET service in PCa and PCb, and then you will log on to

PCb from PCa and to PCa from PCb using the TELNET command. This involves several setups as

follows:

• Assigning proper rights to users to use the TELNET service.

• Activating the TELNET service.

• Testing TELNET service by logging on to PCa and PCb using the TELNET command.

B.1 Telnet Overview

Telnet

is

a

terminal

emulation

program

for

TCP/IP

networks

such

as

the

Internet.

The

Telnet

program runs on your computer and connects your PC to a server on the network. You can

then enter commands through the Telnet program and they will be executed as if you were

entering them directly on the server console. This enables you to control the server and

communicate with other servers on the network. To start a Telnet session, you must log in to a




server by entering a valid username and password. Telnet is a common way to remotely

control Web servers and routers. In this exercise, you will activate the Telnet service in your

computer.

B.2

Adding

Users

to

TelnetClients

In the following steps, you will create a user group called “TelnetClients”. The members of

TelnetClients user group have permission to access your computer through a telnet session.

1. Go to Settings → Control Panel → Administrative Tools →Computer Management

(Local).

2. In the console tree, expand Local Users and Groups, and click Groups.

3. Right Click on the Right Window and select New Group. Type “TelnetClients” in the

Group

Name

Window

(it

is

important

to

write

this

exactly

as

it

is),

then

click

Add.

4. In the Object Names Window type “Everyone” to give all users on your computer

the right to access to the TELNET service.

5. Click Ok. Click Create.

B.3 Starting the Telnet Service

In this exercise, you will start the telnet service in PCa and PCb so that users can log on to them

remotely.

Before

starting

the

exercise,

let

us

check

the

open

ports

in

PCa

and

PCb

as

follows:

in PCa in PCb

type “nmap 192.168.1.102 –n” at the

command line

type “nmap 192.168.1.101 –n” at the

command line

Is port 23 open?

Follow the following steps to start the Telnet Service.

1)

Click

Start,

point

to

Settings,

click

Control Panel,

click

Administrative Tools,

then

Services.

2) Find Telnet, and then double click on it.

3) Click

Log On tab. Check

Local system account box. Click

General Tab, and select.

Startup Type as Manual, then click Apply.




4) Click Start to start the telnet service in your computer.

5) Click Ok. The telnet service should be running on your computer.

The Telnet service should be running on both computers, use nmap to check the open ports

again as described above. Is port 23/Telnet open?

B.4

Testing

Telnet

In this exercise, you will use the TCP/IP Telnet program to log on to PCa from PCb and to PCb

from PCa . Bring up the command prompt in PCb.

1) At the command line,

in PCa in PCb

type “telnet 192.168.1.102” and press

Enter

type “telnet 192.168.1.101” and press

Enter

2) Read the prompted warning and press Enter without doing anything else. Enter

the

user

name

(ask

your

teammate

for

the

user

name

he/she

created

in

step

A)

and password (ist220).

3) To make sure that you are logged into your teammate computer, type “ipconfig”

at the command line and press Enter.

4) In the telnet command prompt, type “shutdown –s “ and press Enter to shut

down your teammate’s computer ☺.

C.

Remote

Desktop

C.1 Overview

With Remote Desktop in Windows XP Professional, you can have access to a Windows session

that

is

running

on

your

computer

when

you

are

at

another

computer.

This

means,

for

example,

that you can connect to your work computer from home and have access to all of your

applications, files, and network resources as though you were in front of your computer at

work. You can leave programs running at work and when you get home, you can see your

desktop

at

work

displayed

on

your

home

computer,

with

the

same

programs

running.




Remote Desktop also allows more than one user to have active sessions on a single computer.

This means that multiple users can leave their applications running and preserve the state of

their Windows session even while others are logged on.

C.2

Set

up

the

Remote

Desktop

Connection

In this exercise, you will configure your computer for the Remote Desktop Connection.

1. Open Control Panel, Click System in the Control Panel.

2. On the Remote tab, check Allow users to connect remotely to this computer

checkbox.

3. Click Select Remote Users. Then, click Add. In the window, type “Student2” for user

name and click Ok to save your settings.

C.3

Using

Remote

Desktop

In this exercise, you will first access PCa Desktop from PCb, and then repeat the same exercise

by accessing PCb from PCa.

1. In PCb, Go to Start → Programs → Accessories → Communication → Remote

Desktop Connection.

2. In the window, type “192.168.1.101”, use the user name “Student2” and password

“student2”.

Click

OK.

Repeat the same exercise and connect PCb from PCa.

D. Capturing and Analyzing Telnet Packets

In this exercise, you will capture Telnet packets and discover user account and password

information from the packets captured. PCa will capture packets while PCb is connecting to the

telnet

service.

1) Only PCa: Bring up the command prompt.

2) PCa and PCb: Start Wireshark and start capturing packets.

3) Only

PCb: At the command prompt, type “telnet 192.168.1.101” and press

Enter to log on to PCa.




4) Only

PCb: Enter user name (Student2) and password (student2).

5) PCa and PCb: Stop capturing packets.

6) Analyze each captured packet and try to find out packets that transfer the

password and user name information by looking at their content. Can you see

the password transmitted?

telnet remote desktop (1)

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