ZyXEL Communications Internet Security Gateway ZyWALL 100 - Manual (Page 168)

ZyWALL 100 Internet Security Gateway
15-8 Using the ZyWALL Web Configurator
1. If the Blocking Time timeout is 0 (the default), then the ZyWALL deletes the oldest existing half-open
session for the host for every new connection request to the host. This ensures that the number of half-
open sessions to a given host will never exceed the threshold.
2. If the Blocking Time timeout is greater than 0, then the ZyWALL blocks all new connection requests to
the host giving the server time to handle the present connections. The ZyWALL continues to block all
new connection requests until the Blocking Time expires.
The ZyWALL also sends alerts whenever TCP Maximum Incomplete is exceeded. The global values
specified for the threshold and timeout apply to all TCP connections. Click the Attack Alert tab to bring up
the next screen.
Figure 15-4 Attack Alert
The following table describes the fields in this screen.
Table 15-3 Attack Alert
FIELD DESCRIPTION DEFAULT VALUES
Generate alert when
attack detected A detected attack automatically generates
a log entry. Check this box to generate an
alert (as well as a log) whenever an attack
is detected. See the Logs Chapter for
more information on logs and alerts.