Routing and WAN connections
BAT54-Rail/F..
Release
7.54
06/08
11.1
General information
353
11 Routing and WAN connections
This chapter describes the most important protocols and configuration en-
tries used for WAN connections. It also shows ways to optimize WAN con-
nections.
11.1General information
WAN connections are used for the following applications.
D Internet access
D LAN to LAN coupling
D Remote access
11.1.1 Bridges for standard protocols
WAN connections differ from direct connections (for example, via the
LANCAPI) in that the data in the WAN are transmitted via standardized net-
work protocols also used in the LAN. Direct connections, on the other hand,
operate with proprietary processes that have been specially developed for
point-to-point connections.
Via WAN connections a LAN is extended, and with direct connections only
one individual PC establishes a connection to another PC. WAN connections
form a kind of bridge for the communication between networks (or for con-
necting individual computers to the LAN).
U Which protocols are used for WAN connections?
WAN connections over highspeed ports (e.g. DSL connections) use the IP
standard for transmitting packets. Devices with an ISDN interface provide be-
side IP additionally IPX.
U Close cooperation with router modules
Characteristic of WAN connections is the close cooperation with the router
modules in the BAT. The router modules (IP and IPX) take care of connecting
LAN and WAN. They make use of the WAN modules to fulfil requests from
PCs within the LAN for external resources.
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