McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Chapter 19 TELNET and Rlogin.

41
McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 Chapter 19 TELNET and Rlogin

Transcript of McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Chapter 19 TELNET and Rlogin.

Page 1: McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Chapter 19 TELNET and Rlogin.

McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000

Chapter 19

TELNETand

Rlogin

Page 2: McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Chapter 19 TELNET and Rlogin.

McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000

CONTENTSCONTENTS• CONCEPT• NETWORK VIRTUAL TERMINAL (NVT)• NVT CHARACTER SET• EMBEDDING• OPTIONS• OPTION NEGOTIATION• SUBOPTION NEGOTIATION• CONTROLLING THE SERVER• OUT-OF-BAND SIGNALING

Page 3: McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Chapter 19 TELNET and Rlogin.

McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000

CONTENTS CONTENTS (Continued)(Continued)

• ESCAPE CHARACTER• MODE OF OPERATION• EXAMPLES• USER INTERFACE• RLOGIN (REMOTE LOGIN)• SECURITY ISSUE

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McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000

TELNET and Rlogin are TELNET and Rlogin are general-purpose general-purpose

client-server application programs.client-server application programs.

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McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000

CONCEPT

19.119.1

Page 6: McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Chapter 19 TELNET and Rlogin.

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Figure 19-1

Local login

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Figure 19-2

Remote login

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NETWORKVIRTUAL

TERMINAL

19.219.2

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McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000

Figure 19-3

NVT

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McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000

NVTCHARACTER

SET

19.319.3

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Figure 19-4

Format of data characters

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Figure 19-5

Format of control characters

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McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000

EMBEDDING

19.419.4

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McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000

Figure 19-6

Embedding

Page 15: McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Chapter 19 TELNET and Rlogin.

McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000

OPTIONS

19.519.5

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McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000

OPTIONNEGOTIATION

19.619.6

Page 17: McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Chapter 19 TELNET and Rlogin.

McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000

Figure 19-7

Offer to enable

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McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000

Figure 19-8

Request to enable

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McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000

Figure 19-9

Offer to disable

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McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000

Figure 19-10

Request to disable

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Figure 19-11

Echo option example

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SUBOPTIONNEGOTIATION

19.719.7

Page 23: McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Chapter 19 TELNET and Rlogin.

McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000

Figure 19-12

Example of suboption negotiation

Page 24: McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Chapter 19 TELNET and Rlogin.

McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000

CONTROLLINGTHE

SERVER

19.819.8

Page 25: McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Chapter 19 TELNET and Rlogin.

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Figure 19-13

Example of interrupting an application program

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McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000

OUT-OF-BANDSIGNALING

19.919.9

Page 27: McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Chapter 19 TELNET and Rlogin.

McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000

Figure 19-14

Out-of-band signaling

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ESCAPECHARACTER

19.1019.10

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Figure 19-15Two different interruptions

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MODEOF

OPERATION

19.1119.11

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McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000

EXAMPLES

19.1219.12

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McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000

Example 1Example 1

In this example, we use the default mode to show the concept and its deficiencies even though it is almost obsolete today. The client and the server negotiate the terminal type and terminal speed and then the server checks the login and password of the user. See Figure 19.16.

Page 33: McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Chapter 19 TELNET and Rlogin.

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Figure 19-16 Example1

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McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000

Example 2Example 2

In this example, we show how the client switches to the character mode. This requires that the client request the server to enable the SUPPRESS GO AHEAD and ECHO options. See Figure 19.17.

Page 35: McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Chapter 19 TELNET and Rlogin.

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Figure 19-17

Example 2

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USERINTERFACE

19.1319.13

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RLOGIN(REMOTE LOGIN)

19.1419.14

Page 38: McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Chapter 19 TELNET and Rlogin.

McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000

The Rlogin process uses the TCP port 513.

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Figure 19-18

Connection establishment

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McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000

Figure 19-19

Sending ss command from the client to the server

Page 41: McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Chapter 19 TELNET and Rlogin.

McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000

SECURITYISSUE

19.1519.15


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