On p. 43 in Chapter 3, the second paragraph begins "The right panel shows
the same setup using a virtual private network." The sentence refers to
Figure 3-1, which contains no second panel. Like many other figures in the
book such a panel would contain an Internet cloud instead of a leased line.

In Figure 5-3, p. 72, the "Windows NT 4.0 RAS Server with PPTP" box should
be associated with 204.96.12.60, not 204.96.12.25.

On p. 107 in Chapter 7, the last paragraph begins "In Figure 7-1..." This
figure was inadvertantly omitted from the book. But the text in that
paragraph should be enough to convey the configuration.

On p. 108, the address on top of the "Tunnel Server" at the top of the
figure should read 20.15.26.6 instead of 20.15.26.7. The "Tunnel Network"
box on the bottom of the figure should have an address of 192.261.5.7
instead of 192.261.5.6.

Readers may be confused by the references to versions of the Windows NT
Service Pack. Several Windows NT 4.0 VPN products needed a certain Service
Pack level in order to operate properly.  The convention used in the book
was to name the Service Pack in which a fix or feature first appeared.  For
example, using DHCP with PPTP filtering requires Service Pack 2 (or later).
 It's important to note, however, that Microsoft Service Packs are
cumulative, so you need to install only the latest one. At the time the
book went to press, the latest was Service Pack 3, so you can assume that
unless you already meet the minimum Service Pack level for the fix or
feature, you should install SP3.