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QMultiFlex-400™ Installation and Operating Handbook
In Figure 7-5, arbitrarily complex networks (potentially with multiple subnets) exist attached
to routers on both sides of the satellite network. The QMultiFlex-400™ is configured for a
unique subnet that it shares with its local router. A single subnet is used over satellite to
connect the satellite ports of the QMultiFlex-400™ and QFlex-400™ modems. The
terrestrial port of each QFlex-400™ is configured to be a unique subnet shared with its
local router.
Figure 7-5 QMultiFlex-400™ Point-to-multipoint Routed Network
If static routing is being used, then static routes are set up in each Teledyne Paradise
Datacom device to route packets as required. Routes can be allocated bandwidth using the
traffic shaping feature and they can also be used to determine which packets are dropped
or forwarded at each remote.
One method of handling unwanted packets at the remotes is to specify 'black hole' static
routes at the remotes that route the unwanted data to non-existent gateways, causing the
packets to be dropped. This prevents unwanted packets being forwarded onto the local
network.
Advanced IP features, including TCP acceleration can be used in point-to-multipoint routing
mode. Unlike in bridging mode, the QMultiFlex-400™ and QFlex-400™ terrestrial IP traffic
ports use explicit IP addresses when in routing mode.
One benefit of routing is that it minimises satellite overhead and therefore increases
bandwidth efficiency, since no ethernet frames are ever transmitted.
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