
Configuring Asynchronous Remote Access Connections • Chapter 2 49
to an access server. This can be useful for modem configuration, trouble-
shooting, or even as part of an application. A reverse Telnet session is initi-
ated from the router to the modem rather than the “normal” forward
connection from the modem to the router. Reverse Telnet sessions are
established by using an active up/up interface on the router’s IP address
and port 2000 + n, where n is the number of the line the modem is con-
nected to. For example, to connect to a modem on line 129, the AUX port
on a Cisco 3640, you would use the following command:
Router#telnet 1.1.1.1 2129
Trying ...