Guralp Systems CMG-DCM build <10,000 - Manual (Page 71)

Operator's Guide
If you are using PPP between, say, two CMG-EAMs, one should be
designated the client and the other the server. The “IP addresses and
routing” parameters for the client should be left blank and those for
the server completed as follows:
If using IPv4 networking, the Local IP address field should be
populated with an IP address from an otherwise unused reserved class
C network address range, such as 192.168.123.1 (with no CIDR postfix)
and the Remote IP address field should be populated with an IP
address from the same network, such as 192.168.123.2 - this address is
provided to the client at connection initiation.
If using IPv6 networking, the Local IP address IPv6 and Remote IP
address IPv6 fields should be used instead.
If the Default route check-box is ticked, the PPP daemon will modify
the routing table on successful connection, setting the remote end of
the PPP link as the default gateway.
The final section of this page handles PPP security:
Enter the User ID and PAP secret given to you by your service provider
in the appropriate fields. Click “Submit” to save the changes.
The standard Linux commands ppp­on, ppp­off, ip, ping, and
traceroute are available from the command line for use in
controlling and testing PPP connections but it is also possible to
configure a “watchdog” service to monitor a PPP connection and
automatically restart it should it fail. This is described in the next
section.
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