Guralp Systems CMG-DCM - Manual (Page 100)

CMG-DCM Data Communications Module
If all these methods are disabled, you may still be able to connect to
the DCM over a serial link using getty (see serial.x.service, above), or
over a direct modem connection. Your settings will come into effect as
soon as you click Save settings, so you should ensure that you have a
backup means of communication with the DCM before disabling these
methods.
net.remoteaccess.allow.telnet : Select yes to allow telnet clients to log
in to the DCM's Linux operating system, or no to disallow connections
over telnet. Select no to disable it. By default, this method is disabled
for security reasons.
net.remoteaccess.allow.ssh : Select yes to allow SSH clients to log in
to the DCM's Linux operating system, or no to disallow connections
over SSH. By default, this method is enabled.
net.remoteaccess.allow.http : Select yes to allow access to the Web-
based administration system by unencrypted HTTP. (A username and
password will still be required, but they are sent over the network
insecurely.) Select no to disable it. By default, this method is disabled
for security reasons.
net.remoteaccess.allow.https : Select yes to allow access to the Web-
based administration system by HTTPS (secure HTTP), or no to disable
it. By default, this method is enabled.
6.11 PPP
These pages allow you to alter the PPP configuration files,
/etc/ppp/options and /etc/ppp/chap-secrets.
These two files are required by the Linux PPP server, and affect all ppp
services on the DCM. Separate PPP options for each port may be
specified under Serial port configuration; see above.
The /etc/ppp/chap-secrets file is only necessary if you are using
CHAP to authenticate PPP connections.
Clicking on either of these entries brings up a page in the work area
which enables you to edit the file and its attributes directly, including
•
the ownership of the file;
•
the permissions (read, write, or execute) of the file for its own
user, its own group, and all others; and
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