System information

Troubleshooting Dialin Connections
Book Title
16-358
Dialin: Dialin Session Sees “Garbage”
Symptom: Attempts to establish remote dialin sessions over a modem to a Cisco access server or
router return “garbage” and ultimately result in no connection to the remote site. Users might see a
“Connection Closed by Foreign Host” message.
Table 16-7 outlines the problems that might cause this symptom and describes solutions to those
problems.
Table 16-7 Dialin: Dialin Sessions Sees “Garbage”
Possible Causes Suggested Actions
Modem speed setting is not locked Step 1 Use the show line exec command on the access server or router. The
output for the auxiliary port should indicate the currently configured
Tx and Rx speeds.
For an explanation of the output of the show line command, see the
“Using debug Commands” section earlier in this chapter.
Step 2 If the line is not configured to the correct speed, use the speed line
configuration command to set the line speed on the access server or
router line. Set the value to the highest speed in common between
the modem and the access server or router port.
To set the terminal baud rate, use the speed line configuration
command. This command sets both the transmit (to terminal) and
receive (from terminal) speeds.
Syntax:
speed bps
Syntax Description:
• bps—Baud rate in bits per second (bps). The default is 9600 bps.
Example:
The following example sets lines 1 and 2 on a Cisco 2509 access
server to 115200 bps:
line 1 2
speed 115200
Note: If for some reason you cannot use flow control, limit the line
speed to 9600 bps. Faster speeds are likely to result in lost data.