4) and broadcasts (Section 13.5): the user can select the host they wish to use,
and the hosts can be discovered by broadcast without each X server system generating
broadcast traffic. However, there is a single point of failure. iI the indirect host is
down, the indirect query will fail. If a large number of X servers rely on a single indirect
host, it may be wise to configure multiple machines to serve in that role with a
failover system such as Heartbeat (http://www.linux-ha.org/).
13.7 The Three Challenges of Remote Access
Three are three challenges that any X remote access solution must address; one
affects performance, and the remaining two affect security:
Network bandwidth and latency
Bandwidth refers to the overall network data-delivery rate; latency refers to the
round-trip delay. X requires moderate network bandwidth and low latency to
deliver an effective user interface.
Figure 13-3. Standard kdm chooser
13.8
182 Chapter 13: Remote Access
Access control
Since unauthorized clients can access the screen (in the same way that xwd [Section
6.11] does), it??™s possible for a malicious client to snoop around your display
and collect personal information, such as your bank account number and balance
if displayed in a browser window.
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