Operation Manual

130 NetWare MultiProtocol Router for ISDN 3.1 Installation and ISDN Configuration Guide
running. These packets must be acknowledged on both sides in
order to maintain the session.
On the server, two solutions are provided: one on the network
protocol and on on the ISDN driver level.
On the network level, propagation of SPX Keep-Alive packets
can be turned off by using SPXWDOG.NLM on the server and
the corresponding mechanism on the client. See the NetWare
MultiProtocol Router 3.1 Release Notes, p. 40, for information
about using SPXWDOG.
The NetWare MultiProtocol Router for ISDN provides SPX
Spoofing on the ISDN driver level to acknowledge SPX keep-
alive packets issued by the application server locally, and not to
transmit them over ISDN to the client site. If the ISDN connec-
tion to the client site is cleared, the NetWare MultiProtocol
Router for ISDN will stop acknowledging keep-alive packets
issued by the application server. In this way, the ressources
reserved for the client will be released after 75 minutes at the
latest if the user at the client site switches off the PC without
logging out properly. This is indispensible for host sessions and
database applications, since otherwise the reserved ressources
would never be released.
Default: Enabled
Options: Enabled, Disabled
When SPX Spoofing is enabled, SPX keep-alive packets issued by
the application server are never transmitted to the remote site,
but are acknowledged locally by the NetWare MultiProtocol
Router for ISDN.
If you select "Disabled", ISDN connections over this interface to
remote sites would be set up when SPX keep-alive packets,
generated by the server component, are to be transferred.
For the client application, it is absolutely necessary to transmit a keep-
alive packet at least every hour to check whether the server is still
there.
To minimize call set-ups initiated by the client, you must set the SPX-
specific timers on the client to a value appropriate for use with ISDN.
This is done in the network configuration of the client. A value of 65 000
for "spx verify timeout" and "spx abort timeout" will let the client issue
appr. one SPX keep-alive packet per hour.
Warning