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Table Of Contents  The TCP/IP Guide
 9  TCP/IP Application Layer Protocols, Services and Applications (OSI Layers 5, 6 and 7)
      9  TCP/IP Key Applications and Application Protocols
           9  TCP/IP Interactive and Remote Application Protocols
                9  Berkeley Remote ("r") Commands

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Berkeley Remote ("r") Commands
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Berkeley Remote Shell (rsh)
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Berkeley Remote Login (rlogin)
(Page 2 of 2)

Automating rlogin

In some organizations, many different UNIX hosts are used every day and needing to type passwords all the time when using rlogin was deemed to be somewhat of a chore. On these systems, it is possible for administrators to set up control files that specify combinations of host names, user names and passwords. If set up correctly, this enables an authorized user to utilize rlogin to remotely access a host automatically, without having to enter either a login name or password, which can be a time savings.

rlogin Security Concerns and slogin

As originally designed, rlogin is a classic example of a protocol from the early days of TCP/IP: it emphasizes simplicity and usability over security. This is especially true of the automated login process just described. The original schemes used by rlogin for authentication are considered inadequate for modern TCP/IP internetworks, especially those connected to the Internet. Later versions of rlogin have been enhanced with more secure authorization methods. There is also a newer program called slogin (for secure login) that uses stronger authentication and encryption, and is intended to replace rlogin on newer systems.

Key Concept: The Berkeley remote or “r” commands facilitate remote operations between UNIX hosts on a TCP/IP internetwork. The base command of the family is the remote login command, rlogin, which allows a device on one host to access and use another as if he or she were locally connected to it. rlogin is often used as an alternative to Telnet, but is simpler both conceptually and practically.



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