Operation Manual

Static and Dynamic Routing
13 NT/MPRI – 1 Introduction
The predefined profiles for destinations (IP, IPX, IP+IPX and Internet)
can be used to simplify the administrator’s task of configuration.
All configuration information is written in a special configuration data-
base, NTR.MDB. This database is located in the installation directory of
the NT/MPRI and can be viewed with Microsoft Access.
Static and Dynamic Routing
Like any router, the NT/MPRI functions on the network protocol level
(layer 3 of the ISO/OSI reference model) and forwards incoming data
packets to other networks connected to the router. For this the follow-
ing information is required:
l the logical address of the destination
l the path to the destination
Every network protocol uses its own kind of address. A comprehensive
explanation of TCP/IP addresses is presented in the glossary at
“TCP/IP Addresses” on page 123.
Information about the possible paths of data packets are summarized
in what is known as a “routing table”. Routing tables can be generated
statically or dynamically:
l Static:
In static routing all destination networks and the corresponding
information are configured manually and will not be changed au-
tomatically.
l Dynamic:
In dynamic routing a routing protocol is used which routers in the
entire network use to announce at regular intervals changes in
their routing tables.
The NT/MPRI uses the following kinds of routing:
l for IP:
dynamic routing with RIP 2 on the LAN end and static routes over
ISDN
Static routes over ISDN excludes the possibility of connections
being established through the dynamic exchange of RIP packets.
During configuration it can be specified whether a static route
should always be known in the WAN or whether it should not be
made known until the administrator establishes a logical ISDN
connection. In the former case the logical ISDN connection is es-
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