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MSS User Guide 6: Troubleshooting
6-3
RARP Troubleshooting
Table 6-4. RARP Troubleshooting
Area to Check Explanation
The MSS name and hardware
address in the host's
/etc/ethers file
The MSS name and hardware address must be in this file for the host to
answer a RARP request.
The MSS name and IP
address in the
/etc/hosts file
The MSS name and IP address must be in this file for the host to answer a
RARP request.
The operating system
Many operating systems do not start a RARP server at boot time. Check the
host's RARPD documentation for details, or use the ps command to see if
there is a RARPD process running.
TFTP Troubleshooting
If the TFTP request fails even though you have configured your host to respond to the
request, check the areas discussed in the following table.
Table 6-5. TFTP Troubleshooting
Area to
Check
Explanation
Is TFTP
enabled on
the loadhost?
Ensure that the /etc/inetd.conf file has an uncommented line enabling the TFTP daemon.
Machines may have the TFTP daemon line commented out. If the /etc/inetd.conf file has to
be modified, the TCP/IP server process (daemon) has to be told of this via a signal. Find the
process ID (PID) of the inet daemon, and then signal the process. Normally, the process is
signalled by sending it a HUP signal (kill -HUP nnnnn). The /etc/inetd.conf or
/etc/netd.conf file is re-read whenever the UNIX host boots. See the man pages (man inetd)
for more information.
Is the filename
correct?
The name and case of the software download file must be correct. The software file names
are uppercase, but can be renamed. The server will look for uppercase names by default.
Modem Configuration Checklist
Note: Modem functions do not apply to RS-485.
Most modem problems are caused by cabling mistakes or incorrect modem configuration.
However, the following items should be verified after any modem configuration, and re-
checked when there is modem trouble.
The modem must disconnect immediately when DTR is de-asserted.
The modem must assert CD (or DSR, if connected) when connected to another
modem. It must not assert CD when disconnected. The modem may optionally
assert CD during outbound dialing.
The modem and MSS must agree on the flow control method and baud rate
scheme.
The modem must not send result codes or messages to the MSS except
optionally during outgoing calls.
The modem should be set to restore its configuration from non-volatile memory
when DTR is dropped.