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Chapter 3
Network Mode
Nat Mode
Relay Mode
Remote Control
14
Operational Features
By default the 9502 is configured for NAT mode in the Network
Mode field on the IP Address/DHCP settings page.
In NAT mode once a PDP context is active, the UT will translate
between the local and global IP addresses. This is a basic NAT that
only performs IP address translation. It does not use port
translation.
In Relay mode the UT will supply the global IP address to the TE
when the context is established. Relay mode is single user and only
supports a single connected TE.
In Relay mode DHCP is required to provide the global IP address
to the TE. When the context is activated, the DHCP server in the
UT will NACK the next DHCP lease renewal from the TE and
assign the global IP address assigned by the network. The local IP
connection will be torn down and reestablished as the IP address
changes. Similarly, when the context is deactivated the DHCP
server will NACK the lease renewal and then reassigns the original
private IP address.
The Web UI will lose and reestablish its connection to the terminal
as the IP address is changed.
To make the IP address change happen quickly a short DHCP lease
should be used. The terminal defaults the lease time to 60 seconds
in idle and connected mode.
Note that Relay mode only supports a single user TE.
The 9502 can be controlled remotely via SMS and locally via AT
commands. The AT interface allows remote control if AT
commands can be sent by smart terminal equipment (TE) that is
controlled via the IP pipe over the PDP context. The syntax of the
AT commands is covered in the "Inmarsat BGAN UT-TE Interface
Specification".
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