ELSA LANCOM Business LC-4X00, Manual

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Operating modes and functions
ELSA LANCOM Business
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internal or external tables. The affected routes are thus not used, information on
them is not provided and the services are not offered in the local network.
– RIP and SAP packets are always transmitted, i.e. no filters are used. These
packets, however, must occupy a part of the connection.
– RIP and SAP packets will only be sent if the information they contain has been
modified in some way.
– RIPs and SAPs can be transferred at regular, selectable intervals. Information is
usually sent out in one minute intervals. The time interval between blocks can
be stretched to up to 60 minutes.
– The most economical handling of RIP and SAP packets involves transmitting the
information only once, when a connection is established.
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IPX and SPX watchdogs:
These data packets are used by the server to determine whether workstation
computers, for example, are still active or if they can be logged off. To ensure that
these ”Are you there?“ packets for computers on a remote network do not
continually result in connections being established, you can set the responses to
these requests as follows:
– IPX watchdogs receive no response. The computers are logged off after a time
specified on the server.
– IPX and SPX watchdogs can be responded to locally. This procedure is known as
spoofing. The router responds in place of the computers addressed, which are
then never logged off. It is also recommended that a time is set on the server
after which the devices in question are always logged off.
– IPX and SPX watchdogs may of course be routed as normal but this frequently
results in a connection being established.
Further information on IPX, the IPX router and the associated parameters can be found in
chapter 'Setup/IPX-module' in the reference manual.
IP routing
An IP router works between networks which use TCP/IP as the network protocol. This
only allows data transmissions to destination addresses entered in the routing table.
This chapter explains the structure of the IP routing table of an ELSA router, as well as
the additional functions available to support IP routing.
The IP routing table
Use the IP routing table to tell the router which remote station (which other router or
computer) it should send the data for particular IP addresses or IP address ranges to. This
type of entry is also known as a ”route“ since it is used to describe the path of the data