SHAPING THE FUTURE OF SATELLITE COMMUNICATIONS
2.1.3.3 Modem Configuration
The modem configuration is almost identical to the configuration for an IP bridge:
only the remote subnet of the IP interface is set to 0.0.0.0/0. This means that the
device will not perform proxy ARP for the remote IP addresses.
In a point to point set up, one default route can be set. It is one default Ethernet Rx
route that will filter out the needed traffic and put into a DVB-S2 stream.
In a point to multipoint set up, multiple routes can be set in the Ethernet Rx routes.
The result of each Ethernet route can be put in different DVB-S2 streams. Each
remote side modem can then filter out the appropriate DVB-S2 stream containing
the IP data for its network.
IP bridging is often preferred above IP routing:
The routers at both sides of the satellite link stay neighbours for each other.
Routing protocols, IGMP (Internet Group Management Protocol), and many other
IP services pass transparently over the satellite link.
2.1.3.4 Remote Router Configuration
It has an IP interface in the remote subnet (6.6.6.0/24 in this example). The next
HOP IP address for the return path is the IP address of the Ethernet interface of
the modem.
It is not mandatory to assign an IP address to the Ethernet interface of the IP
modem. This is especially important when the satellite modem is used in
residential configurations.
The In-band IP address of the GBE interface cannot be reached
from the other side of the satellite link.
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