I-MO 520 Series Product Installation Manual - page 18
INSTALLATION MANUAL FOR THE EMS I-MO 540 SERIES APPLIANCE
Version
1.2
ELECTRONIC MEDIA SERVICES LIMITED
PASSFIELD BUSINESS CENTRE, LYNCHBOROUGH ROAD, LIPHOOK, HAMPSHIRE, GU30 7SB, UK
Tel: 01428 751655 | Fax: 01428 751654 | E-mail: imo@ems-uk.com
Page
18
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You need to specify a unique Concentrator IP for each cellular modem that is installed.
The Concentrator Key is a shared secret used to authenticate the i-MO appliance with the Concentrator. The
randomness and length of the key affects the quality of the encryption if enabled. For applications that
require good security you should use a 16 or 32 character key and it should consist of numbers plus upper
and lower case letters. Standard dictionary words should not be used.
This is an example of a poor key: thisismykey
This is a much stronger key: vjXt3Z7bqw6rjUXe
Traffic over the tunnel can be encrypted setting encrypt option equal to yes. The default encryption is
Blowfish 128.
The compress option enables compression of data sent over the bonded channel.
The protocol version allows for communication with Concentrators running different i-MO releases. It should
normally be configured for a value of 2.
The Client IP is the internal endpoint of the tunnel on the i-MO appliance which is used on the Concentrator
for routing and must be unique.
Firewall Tab
The Firewall tab configures various options for the firewall.