Information Technology Reference
In-Depth Information
16
CHAPTER
Troubleshooting Dialup Connections
This chapter introduces and explains some of the technologies used in dialup networks. Configuration
tips and interpretations of some of the
show
commands, which are useful for verifying correct operation
of the network, are found in this chapter as well. Actual troubleshooting will be found in Chapter 17,
“Troubleshooting ISDN Connections.”
This chapter focuses on four principal areas:
Modem Operations
1.
Using the
modem autoconfigure
Command
-
Establishing a Reverse Telnet Session to a Modem
-
Using Rotary Groups
-
Interpreting
show line
Output
-
Gathering Modem Performance Information for Trend Analysis
-
ISDN Operations
2.
Components
-
Services
-
Interpreting
show isdn status
Output
-
Dialer Operations
3.
Dialer Maps
-
Dialer Profiles
-
PPP Operations
4.
LCP
-
Authentication/AAA
-
NCP
-
Modem Operations
This section discusses issues related specifically to the setup, verification, and use of modems with Cisco
routers.
