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- Network Working Group J. Postel
- Request for Comments: 866 ISI
- May 1983
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- Active Users
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- This RFC specifies a standard for the ARPA Internet community. Hosts on
- the ARPA Internet that choose to implement an Active Users Protocol are
- expected to adopt and implement this standard.
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- A useful debugging and measurement tool is an active users service. An
- active users service simply sends a list of the currently active users
- on the host without regard to the input.
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- An active user is one logged in, such as listed in SYSTAT or WHO.
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- TCP Based Active Users Service
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- One active users service is defined as a connection based application
- on TCP. A server listens for TCP connections on TCP port 11. Once a
- connection is established a list of the currently active users is
- sent out the connection (and any data received is thrown away). The
- service closes the connection after sending the list.
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- UDP Based Active Users Service
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- Another active users service service is defined as a datagram based
- application on UDP. A server listens for UDP datagrams on UDP port
- 11. When a datagram is received, an answering datagram is sent
- containing a list of the currently active users (the data in the
- received datagram is ignored).
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- If the list does not fit in one datagram then send a sequence of
- datagrams but don't break the information for a user (a line) across
- a datagram. The user side should wait for a timeout for all
- datagrams to arrive. Note that they are not necessarily in order.
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- User List Syntax
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- There is no specific syntax for the user list. It is recommended
- that it be limited to the ASCII printing characters, space, carriage
- return, and line feed. Each user should be listed on a separate
- line.
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- Postel [Page 1]
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