HP-UX Internet Services Administrator's Guide (August 2003)

Troubleshooting Internet Services
Troubleshooting Overview
Chapter 5102
Diagnosing Repeater and Gateway Problems
If you are using a repeater, and hosts on either side of the repeater are
having difficulty communicating with each other, a repeater subsystem
failure may have occurred. In Figure 5-1, all of the systems on side A are
able to communicate with each another. All the systems on side B are
able to communicate with each other. If communication is cut fromside A
to side B, the repeater subsystem is suspect for causing the fault,
because it is the medium by which side A and side B communicate.
Figure 5-1 Troubleshooting Networks that Use Repeaters
The same concept holds for communication through a gateway. If you
suspect a gateway problem, try the following procedures:
• To determine if you are set up to communicate with the desired node,
execute the following:
netstat -r
• To obtain routing statistics, execute the following:
netstat -rs
Network
Tracing
A utility that traces link-level traffic to and from
a node. HP recommends that you enable tracing
only when troubleshooting a problem unsolved by
other means.
Table 5-1 Diagnostic Tools (Continued)
Tool Description
Repeater MAU
A
LAN
Repeater MAU
B
Repeater
Unit
computer computer computer computer
Repeater AUI
cable A
Repeater AUI
cable B
Side A Side B