Operation Manual

121 NT/MPRI – Glossary
Proxy ARP
Proxy ARP is not actually a protocol, but an NT/MPRI extension to an-
swer ARP queries using the current routing table, instead of forwarding
the queries to remote stations over ISDN. This allows remote users or
small networks to use the same IP address range that is valid on the
NT/MPRI’s LAN segment, thus simplifying configuration.
RIP (Routing Information Protocol)
The Routing Information Protocol (RIP) is used to exchange routing in-
formation between networks (IP and IPX). An RIP router is a computer
or other hardware component which transmits routing information
(such as network addresses) and relays IP frames in connected net-
works. RIP allows a router to exchange routing information with other
routers in the network environment. If a router detects any change in
the network (such as an unavailable router), it relays the information to
other routers. In addition, routers send regular RIP broadcast packets
containing all the routing information they can provide. These trans-
missions serve to synchronize all routers in the network.
Route
A route describes the path along which a data packet must travel in or-
der to reach its call destination. A return route must be defined at the
receiving end so that a reply packet can be sent back to the initial
sender of the data packet.
SAP (Service Advertising Protocol)
A protocol in NetWare environments. NetWare servers use SAP to in-
form all stations in the network what services are available.
Short-Hold Mode
The short-hold mode entails the physical disconnection of idle ISDN
links after a specified time. Charges are incurred for physically active
ISDN connections, regardless of whether or not data is being transmit-
ted. Because ISDN connection setup is so fast (1 to 2 seconds), it is fea-
sible to clear down the physical ISDN connection if no data has trav-
eled over the line for a certain time. Depending on the configuration,
the logical ISDN connection remains. As soon as data is queued for
transmission, the physical connection is reestablished. This takes
place transparently for the network user.
ntmpri-e.book Seite 121 Donnerstag, 28. Februar 2002 11:26 11