Iridium 9801 Installation Manual page 26

Iridium Openport Terminal I 4 Installation
Subnet Mask
This defines the subnet used on the vessel. The factory default is
255.255.255.0. You should only change this default if you change the IP
address of the ISU. All network devices must use the same subnet in order
to communicate with one another.
Dynamic Host Configuration Protocol (DHCP) server
This automatically provides unique IP addresses and appropriate
configuration parameters to each network device connected to the ISU. In
the current configuration, DHCP is disabled.
Note: While DHCP is disabled, devices connected to the ISU will need to
have their network settings manually configured. There must only be one
DHCP server on any network segment. Please see insert on "how to
configure network connections manually with windows."
DHCP IP Address minimum and maximum
This sets the range of IP addresses for the DHCP server to use. The factory
default is 192.168.0.2 to 192.168.0.254. The range specifies the maximum
number of devices on the network. Both the maximum and minimum
value must be in the same subnet.
Domain Name System (DNS) forwarding
DNS is used to convert network names (such as www.google.com) into
the IP addresses needed to connect to the device. The factory default is
disabled. The ISU acts as a switching station so that it automatically
forwards DNS requests to the appropriate DNS server.
Once you change the LAN configuration and press the 'Update IP
Configuration' button the ISU will reboot to apply the configuration
changes - this will drop any calls. Once the ISU has rebooted any
connected network devices may take up to 10 minutes to automatically
obtain new settings. During this switch over time the network devices
may not be able to communicate with the ISU or/and duplicate IP address
settings can occur.
If you change the LAN settings it is advisable to reboot any attached
devices to avoid this issue
Note: The LAN Settings can be reset to the factory defaults using the
reset switch on the BDE.
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