Newtec EL170 User Manual page 33

Network Models and Traffic
Routing
2.1.2.8 Directly attached Host Configuration:
The routers as well as the PCs that are drawn inside the satellite subnet don't need
to know that the satellite subnet is split into different IP ranges. The subnet of the
routers and the directly attached IP hosts must be equal to the full satellite subnet
(10.0.0.x/24)!
If the routers and the directly attached IP hosts are not configured inside the
complete satellite subnet, the modem is considered as a router instead of a bridge,
and the local router and the remote router will no longer be neighbours: this will
blocks several routing protocols, and possibly also other high level applications.
2.1.2.9 Example: IP point-to-point configuration (= IP conserving configuration)
Modem_B has only 1 directly attached host, being the router or the PC of an end
user. Modem B is configured in an "IP address conserving" way: in this case we
have not allocated an IP address to the Ethernet interface of Modem B.
In the IP point-to-point configuration on modem B, the local subnet contains only 1
host IP address. The local subnet on modem B is a /32 subnet that contains only
the IP address of the router or the end user PC.
Figure 5 - Point to Point Set-up
version 4.2
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User Manual for EL170/970/470 IP Satellite Modulator/
SHAPING THE FUTURE OF SATELLITE COMMUNICATIONS
Demodulator/Modem