Guralp Systems CMG-DCM build <10,000 - Manual (Page 93)

Acquisition Modules and Platinum Firmware Networking Configuration
7.7.2.2 IP
The IP addresses and routing section handles the network configuration. In
active/client mode or when connecting to an ISP, the remote PPP daemon will
set these parameters, in which case this section can be left blank.
If you are using PPP between, say, two acquisition modules, 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:
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.
IPv6 networking: the Local IP address IPv6 and Remote IP address IPv6
fields should be populated.
Default route: If selected the PPP daemon will modify the routing table on
successful connection, setting the remote end of the PPP link as the default
gateway.
MAN-EAM-0003 93 Issue E - February 2014