ZyXEL Communications Prestige 662HW Series, User Manual

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Prestige 662HW Series User’s Guide
12-20 Firewall Configuration
The Prestige also sends alerts whenever TCP Maximum Incomplete is exceeded. The global values
specified for the threshold and timeout apply to all TCP connections.
Click Firewall , and Threshold to bring up the next screen.
Figure 12-14 Firewall: Threshold
The following table describes the labels in this screen.
Table 12-8 Firewall: Threshold
LABEL DESCRIPTION DEFAULT VALUES
Denial of Service Thresholds
One Minute Low This is the rate of new half-open sessions that
causes the firewall to stop deleting half-open
sessions. The Prestige continues to delete half-
open sessions as necessary, until the rate of new
connection attempts drops below this number.
80 existing half-open sessions.
One Minute High This is the rate of new half-open sessions that
causes the firewall to start deleting half-open
sessions. When the rate of new connection
attempts rises above this number, the Prestige
deletes half-open sessions as required to
accommodate new connection attempts.
100 half-open sessions per minute.
The above numbers cause the
Prestige to start deleting half-open
sessions when more than 100
session establishment attempts
have been detected in the last
minute, and to stop deleting half-
open sessions when fewer than 80
session establishment attempts
have been detected in the last
minute.
Maximum
Incomplete Low
This is the number of existing half-open sessions
that causes the firewall to stop deleting half-open
sessions. The Prestige continues to delete half-
open requests as necessary, until the number of
existing half-open sessions drops below this
number. 80 existing half-open sessions.