PortServer Terminal Server
Ÿ
Page 101
PortServer Port Numbers
The PortServer provides two ranges of TCP/IP service numbers that you can connect to from
other systems:
2001 - 2099
Telnet Connect
2101 - 2199
Raw Connect
A connect made to any 20XX port uses the Telnet protocol, providing full Telnet compatibility.
You would use the 20XX ports in commands like:
pr myfile | telnet dbps-nodename 2001
A connect to any 21XX service is a raw connection, passing 8-bit clean data at all times. This is
useful with the RTTY command described on page 89, and for custom applications.
The last two digits in each number indicate to what port or group the user is to be connected. If
the last two digits are 01 - 16, a connection is made to the specified port. Numbers greater than
16 indicate a port group number, as configured with
set
port
group=
group_number (see page
52).
When several PortServer ports are configured with the same group number, they work like a
telephone “hunt group.” Any attempted connection goes to the lowest numerical port number
that can currently accept a connection.
The
altip
command (page 40) can be used to define alternate IP addresses for telnetting to a
port or huntgroup. (This option does not support raw connect.) You could replace
telnet abc
2080
with
telnet
abcalt
, assuming that
abcalt
has an IP address associated with group 80
in the
altip
table, and
abcalt
is defined in a host table. The “group number” (rightmost two
digits) should be in the range 17-99.
Choosing the wrong range of service numbers, (for example, 20xx instead of
21xx) is a common source of user problems.
