SHAPING THE FUTURE OF SATELLITE COMMUNICATIONS
2.1.2.2 Router Configuration:
The router is configured with the full satellite subnet (e.g. a /24 subnet), and not the
limited local subnet.
The next-hop IP address for the local router is the remote router, and not the local
modem (the local modem acts like a bridge).
We refer to Figure 3.
2.1.2.3 Modem Configuration:
On the modem (or modulator, or demodulator), we make a distinction between the
local IP range, and the IP range that is at the other side of the satellite link. On
each modem, we select an IP range as local subnet (e.g. a /29 subnet, with a
limited number of IP addresses) and a remote subnet (e.g. the full satellite subnet:
the /24 subnet). The modem has the longest prefix match algorithm, to determine
whether an IP address exists locally, or whether it is located at the other side of the
satellite link.
Figure 4 - IP Bridge Configuration
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