Refer to your router manual to see how
the lines are counted on that specific platform. As an example, the
Cisco 3640 router has four slots and each of those has preassigned
line numbers, as shown in Table .
The interface number of a port in a Cisco 3600 series is determined
by using the following formula:
Interface number = (32 x Slot number) + Unit number + 1
For example, asynchronous port 12 in slot 1 corresponds to interface
number 45 (32 x 1) + 12 + 1 = 45. This is also the line number for the port. Port 12 in slot 1 is always assigned interface number 45, regardless of whether the module in slot 0 is a 16-port asynchronous module, a 32-port asynchronous module, or some other type of module entirely; or even whether there is a network module in slot 0 at all. If you move the module in slot 1 to a different slot, however, its interface numbers change.
Table shows the services provided, and the TCP port numbers for individual lines and rotary groups.
Use the transport input protocol command to specify which protocol to allow for connections. For example, transport input all allows all of the following protocols to be used for the connection: lat, mop, nasi, none, pad, rlogin, Telnet, and v120. Each of these protocols can be specified individually as a command option.
Reverse Telnet—Minimum Configuration
To successfully perform a reverse Telnet to the modem attached to
your router, the line interface must have been configured with the
transport input all
and
modem inout
commands. Figure
shows an example of a reverse Telnet connection.
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