Administering a system remotely can be done for a workstation
booted off its serial port A or port B. This can be done with
direct connections (dumb terminal or sparc station) or
indirectly using telnet. In the latter case, a serial connection from A
or B must be made to a Network Terminal Server or Contentrator. (Telneting
to a pseudo-tty will not allow sending a break signal as it is not
a console device.)
1) Using telnet:
telnet to host and log in. To get to the 'telnet>' prompt
press:
<ctrl>-]
Then type:
send brk
or
send break
(depending on terminal concentrator requirements)
2) Using a direct connection to generate a BREAK signal on the line:
Use either 'kermit' or 'tip' (in a shell tool) to connect
to /dev/cua/a. The connection is made via a null-modem
serial cable to the A or B port of the workstation to be administered.
If using 'tip', press <RETURN><TILDE><POUNDSIGN>
<CR>~#
In 'kermit', the sequence is control-backslash-B
^\B
After much discussion, it has been decided to alter the code sequence
that is required to produce "STOP-A" functionality via the serial console
port. The new sequence
is
<RETURN> <TILDE> <CONTROL-B>
It is highly unlikely that this will every be generated erroneously.
As a further safeguard, it is time-limited. There must be more than 0.5
seconds between characters, and
the string must be entered in less than 5 seconds.
The new functionality is enable by changing the /etc/defayult/kbd file:
#KEYBOARD_ABORT=enable
to
KEYBOARD_ABORT=alternate
or alternatively, as root, running the command
# kbd -a alternate
The change is available as follows:
2.5.1 or lower - upgrade to 2.6 or better
2.6
- requires patch 105924-10 or later
7
- requires patch 107589-02 or later
8
- functionality is already integrated.
Sources:
Ben Humphreys <benh@zipworld.com.au>
James McPherson <James.McPherson@Aus.Sun.COM>
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