From that point on, the indirect host is not involved
in any communication between the X server and the XDMCP host. However, if the
XDMCP host??™s authentication dialog includes a Disconnect option, that option will
cause the connection to the indirect host to be re-activated, and the host menu to
once again be displayed.
Although the default configuration for all common display managers is to discover
the list of hosts for the chooser list by broadcast, it is also possible to configure the
chooser to present a list of selected hosts only. Those hosts will still be queried to
ensure that they are accepting XDMCP connections, and only hosts that are available
are shown in the chooser??™s list.
13.6
180 Chapter 13: Remote Access
It is also possible to replace the chooser with a program or script that selects the target
host using any criteria you care to code. For example, you could select the host
on a round-robin basis, according to the time of day (East coast server early in the
day, West coast server late in the day), or according to the user??™s IP address.
Figure 13-1. Standard xdm chooser
Figure 13-2. Standard gdm chooser
13.7
13.7 The Three Challenges of Remote Access 181
Using an indirect XDMCP query has several advantages over direct queries (Section
13.
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