Lecture TCP-IP protocol suite - Chapter 19: TELNET and Rlogin

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Chapter 19 TELNET and Rlogin McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 CONTENTS • • • • • • • • • CONCEPT NETWORK VIRTUAL TERMINAL (NVT) NVT CHARACTER SET EMBEDDING OPTIONS OPTION NEGOTIATION SUBOPTION NEGOTIATION CONTROLLING THE SERVER OUT-OF-BAND SIGNALING McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 CONTENTS (Continued) • • • • • • ESCAPE CHARACTER MODE OF OPERATION EXAMPLES USER INTERFACE RLOGIN (REMOTE LOGIN) SECURITY ISSUE McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 TELNET and Rlogin are general-purpose client-server application programs. McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 19.1 CONCEPT McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 Figure 19-1 Local login McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 Figure 19-2 Remote login McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 19.2 McGraw-Hill NETWORK VIRTUAL TERMINAL ©The McGraw-Hill Companies, Inc., 2000 Figure 19-3 NVT McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 19.3 McGraw-Hill NVT CHARACTER SET ©The McGraw-Hill Companies, Inc., 2000 Figure 19-4 Format of data characters McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 Figure 19-5 Format of control characters McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 19.4 EMBEDDING McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 Figure 19-6 Embedding McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 19.5 OPTIONS McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 19.6 OPTION NEGOTIATION McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 Figure 19-7 Offer to enable McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 Figure 19-8 Request to enable McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 Figure 19-9 Offer to disable McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 Figure 19-10 Request to disable McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 Figure 19-11 Echo option example McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 19.7 SUBOPTION NEGOTIATION McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 Figure 19-12 Example of suboption negotiation McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 19.8 CONTROLLING THE SERVER McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 Figure 19-13 Example of interrupting an application program McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 19.9 OUT-OF-BAND SIGNALING McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 Figure 19-14 Out-of-band signaling McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 19.10 ESCAPE CHARACTER McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 Figure 19-15 McGraw-Hill Two different interruptions ©The McGraw-Hill Companies, Inc., 2000 19.11 MODE OF OPERATION McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 19.12 EXAMPLES McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 Example 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. McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 Figure 19-16 McGraw-Hill Example1 ©The McGraw-Hill Companies, Inc., 2000 Example 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. McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 Figure 19-17 McGraw-Hill Example 2 ©The McGraw-Hill Companies, Inc., 2000 19.13 USER INTERFACE McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 19.14 RLOGIN (REMOTE LOGIN) McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 The Rlogin process uses the TCP port 513. McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 Figure 19-18 Connection establishment McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 Figure 19-19 McGraw-Hill Sending ss command from the client to the server ©The McGraw-Hill Companies, Inc., 2000 19.15 SECURITY ISSUE McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000
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