Guralp Systems CMG-DCM build <10,000 - Manual (Page 27)

Acquisition Modules and Platinum Firmware Initial set-up
3.2.4.1 Connection trouble-shooting
If the browser fails to connect, the most likely explanation is that the machine
running the browser does not have working network communications to and
from the acquisition module. This can be verified by “pinging” the IP
address of the browser from the command line of the acquisition module:
eam999 ~ # ping -c3 192.168.0.2
PING 192.168.0.2 (192.168.0.2): 56 data bytes
64 bytes from 192.168.0.2: seq=0 ttl=63 time=2.284 ms
64 bytes from 192.168.0.2: seq=1 ttl=63 time=1.129 ms
64 bytes from 192.168.0.2: seq=2 ttl=63 time=1.944 ms
--- 192.168.42.1 ping statistics ---
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 1.129/1.785/2.284 ms
eam999 ~ #
To resolve this class of problem, ensure that the cables are functioning (which
can be verified by checking the diagnostic lights on most switches/hubs) and
double-check that the PC and acquisition module are on the same subnet
(which means the CIDR suffices must match and the first sections of the IP
addresses – as defined by the CIDR suffices - must also match). The website
http://en.wikipedia.org/wiki/IP_address has some useful information for those
for whom sub-networking is unfamiliar.
3.2.5 Connecting to the command line using SSH
SSH (Secure SHell) is the most flexible way to control an acquisition module,
but it is less friendly than using the web interface. It is possible to configure
more advanced operations using SSH but the majority of control and
configuration tasks can be achieved most easily through the web interface.
SSH is shipped as standard with most Linux distributions and is available for
Windows as part of the free terminal emulation package PuTTY, which is
available from http://www.chiark.greenend.org.uk/~sgtatham/putty/
3.2.5.1 SSH connections using the ssh program
To use SSH, you must know or discover the IP address of the unit, as
described in the previous section. Once you have the IP address, issue the
SSH command on the PC you are using:
mypc$ ssh root@192.168.0.1
Replace 192.168.0.1 with the IP address of the acquisition module.
The first time you use SSH to connect to a host, you will be asked to verify the
“host key”. This is normal but, if you are ever asked this again, it means that
either the host key of the acquisition module has changed – perhaps because
of a firmware upgrade – or there is a network address conflict or, worse, a
security problem on your network.
MAN-EAM-0003 27 Issue E - February 2014