SHAPING THE FUTURE OF SATELLITE COMMUNICATIONS
2.1.3 IP Routing
2.1.3.1 Introduction
The satellite modems can act as a normal router: the satellite modem or modulator
will then be configured as the next HOP of the attached router(s). In such a case
there is no need to perform proxy ARP for remote IP addresses (the remote subnet
is configured to 0.0.0.0/0).
IP routing has the following advantages:
• It reduces overhead on the satellite link;
• The Ethernet link is terminated in the same way a router does. The Ethernet
header and optional VLAN header are not transmitted on the satellite link;
• Multiple VLANs can be terminated on the modem and the data of each VLAN
can be send separated from each other on the satellite link. These VLANs can
be set up again at the remote end of the satellite link;
• Ethernet broadcast traffic, ARP traffic and other L2 control packets are not sent
over the satellite link when IP routing is enabled.
Figure 6 - IP Routing
2.1.3.2 Router Configuration
The IP address of the Ethernet interface on the modem is configured as next HOP
for the routes in the router.
Although the modem behaves like any other router in the network, it has no routing
protocols, like RIP (Routing Information Protocol), OSPF(Open Shortest Path
First), enabled.
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