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Chapter 2 31
Networking Concepts
Internetworks
Internetworks
Two or more networks of the same type or of different types can be
linked together to form an internetwork or internet. For example, if you
wanted to connect the nodes in a Point-to-Point network with the nodes
on a LAN, the combination of the two networks would be called an
internetwork. Creation of an internetwork allows any node on one
network to communicate with any node on another network that is part
of the same internetwork. Up to 256 individual networks can belong to
the same NS internetwork.
The divisions between the networks in an internetwork are called
network boundaries. Nodes in each network will have the same
network address (network portion of the IP address); however, each
network within the internetwork will have its own unique network
address.
The networks in an internetwork may be connected by a bridge or
router, or by HP e3000 systems configured as gateways.
Gateways
One method of joining networks in an internetwork is by using
gateways. An HP e3000 system can have up to 256 gateways (combined
number of full gateways and gateway halves).
Full Gateways versus Gateway Halves
NS 3000/iX allows you to choose between connecting two networks with
a full gateway or connecting them with two gateway halves. A full
gateway is a node configured as a full member of two (or more)
networks for the purpose of passing information between the networks
to which it belongs. The node is considered a member of each of the
networks for which it is configured.
A node that is a gateway half is configured as a member of a network
and as a partner of another gateway half. A gateway half link that joins
two networks connects two nodes (a gateway half pair) by a
Point-to-Point link (NS Point-to-Point 3000/iX Network link). The
gateway half link and pair is not considered a network itself. Each of
the paired gateway halves is configured as a member of a different
network (the two networks to be connected) and as a gateway half on
the same gateway half link. Together, the two gateway halves function
as a full gateway.