TD060100-0MA
30
4
Troubleshooting
Because the
JC-MER-CXB
hardware consists of an
embedded
computer, knowledge of
Linux
will help in
troubleshooting the
system.
Booting Up the Router
When first activated, the
JC-MER-CXB
computer runs
through a self
test. If an error is detected, the router will stop
operating then repeatedly
display an error message advising the
operator to press “Q” to end the
router program and exit to
Linux
.
Note:
Move the null-modem cable from COM2 to COM1 so that
so that
Linux
commands can be entered.
At the bash prompt
type
router
or
reboot
.
Debugging Ethernet Failures
Software tools are provided with the product for checking Ethernet
network errors. These include the programs
ping
,
ipstat
,
testnet
and
a router statistics mode. The
nature of the
ping
and
ipstat
programs
should be familiar to
someone with previous experience with
TCP/IP software.
Prior to using the router statistics mode tools, you may need to
modify the router configuration file (
router
). Add the
following
three switches (upper case letters only) if they are not
already
present:
/A
/S
/M
When the router is running, it displays statistical information as
shown in the example of Figure
15
— providing the null-modem
cable is attached to COM
2
. This display shows ARCNET and
Ethernet message counters.