Bay Networks 5390, Administering, Page: 119 / 888

893-741-B A4-13
The Port Server and Rotaries
When the user issues a telnet command to modems, Telnet tries to locate an available port. First, it
tries port 1 on 5390_01, next port 3, followed by port 8, and so on until an available port is located
(assuming camp-on is set to direct_camp_on=never):
% telnet modems
Trying...
Connected to 132.245.6.80.
Escape character is "^]".
Attached to port 6.
Assigning Rotaries TCP Port Numbers
TCP port numbers in the 6000 range allow you to assign a TCP port number to a rotary that the user
can enter with the telnet or rlogin commands. The last three digits of the port number are arbitrary;
but the TCP port numbers must be unique for each Model 5390 server.
When users include a TCP port number in the 6000 range with the telnet or rlogin commands, they
are attached to the first available port in the rotary. Defining TCP ports for rotaries allows the users
to avoid having to select a particular serial port, especially if auxiliary Internet addresses cannot be
used. The following example is an entry in which a TCP port number is defined for the rotary:
modems: 1,4,6-9@5390_01/6080
Users can issue the following command to access the first available port in the rotary:
% telnet 5390_01 6080
Trying...
Connected to 5390_01.
Escape character is "^]".
Attached to port 9.
NOTE: When creating multiple rotaries under one name, always
disable camp-on so that Telnet tries the next available port if the first
connection fails. Because a modem was not available on the first
Model 5390 server, telnet automatically crossed over to the second
Model 5390 server, 5390_05.
NOTE:
A special version of rlogin, one that accepts TCP port numbers,
is needed to use TCP port numbers with rlogin.