conf or /etc/X11/gdm/
custom.conf):
[xdmcp]
Enable=false
HonorIndirect=false
13.4
178 Chapter 13: Remote Access
To enable XDMCP, change the Enable line to true; it??™s also recommended that you
enable HonorIndirect so that you can use indirect queries (Section 13.6):
[xdmcp]
Enable=true
HonorIndirect=true
Then restart GDM.
13.4 Accessing a Remote Session on a Specific
Host
To access a remote session, command-line options are passed to the X server, which
cause it to contact a remote system using XDMCP. The remote system, in turn, will
draw an authentication screen using the standard X protocol.
To access a remote session on red using an X server on blue, start the X server with
the option -query red:
blue$ X :8 -query red
The X server will attempt to contact the XDMCP server on red, and if successful, a
session login prompt will appear on the display. This is called a direct query because
a specific XDMCP server is contacted directly.
The advantage of directly querying a host in this way is that less network traffic is
generated than when using the broadcast (Section 13.5) or indirect (Section 13.6)
mechanisms.
13.5 Accessing a Remote Session on Any
Available Host
Querying a specific host for a remote session works fine as long as you know the
name of the host and that host is up??”but if you??™re a guest on a network, or you
want to connect to any of several hosts that provide similar services, you??™ll want to
use a broadcast query.
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