6 working with ppp – Guralp Systems CMG-DCM build <10,000 User Manual
Page 69
Operator's Guide
6.5.2 Configuring sshd from the command line
This is a complex issue and use of the web interface is strongly
encouraged unless you are familiar with Linux text editors,
configuration files and sshd itself. The configuration file is located at
/etc/ssh/sshd_config and its syntax and semantics are described
at
More detailed
discussion is beyond the scope of this document.
6.6 Working with PPP
PPP, or Point-to-Point Protocol, is a data link protocol that can carry IP
packets over a serial link between two networking nodes. It can
provide connection authentication, transmission encryption privacy,
and compression. Platinum firmware includes an implementation of
PPP which can be used to provide network links between sites or to
connect to an Internet Service Provider (ISP). A number of “chat
scripts” are provided, allowing connection negotiation and
establishment over PSTN, GPRS and satellite modems.
6.6.1 Setting up a PPP Connection
To configure a PPP connection, you will need a user ID and
authentication code (the PAP secret) as required by the remote server.
In addition, a dial up (chat) script specific to the service you are using
must be created. If one does not already exist for your service, please
contact Güralp support.
To set up this connection, connect to the CMG-EAM configuration
system via either the web interface or by using gconfig from the
command line interface. From the main screen select “Serial ports”
and select the port to which the modem is connected. Change the
function of the port to “PPP. PPP network connection”, with the
correct baud rate for the modem. Click “Submit” to save these
changes. Go back to the configuration of the serial port and click on
“PPP network configuration”.
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Note: Systems are shipped with a pre-authorised client key to
which Güralp Systems' support staff have the matching key.
This allows us to access you unit and reset the root password
should you forget it. You are free to delete this key if you wish.
There is a second (and significantly more complicated) way of
resetting the root password if you have physical access to the
system. Please contact support if you find yourself in this
situation.