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

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Ch19