ZyXEL Communications Prestige 652, User Manual, Page: 151 / 521

Prestige 652 Series User’s Guide
12-4 Firewall Configuration
Figure 12-2 Attack Alert
The following table describes the fields in this screen.
Table 12-1 Attack Alert
LABEL DESCRIPTION
Generate alert
when attack
detected Select this check box to generate an alert whenever an attack is detected.
Denial of Services 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" is the default.
One Minute High This is the rate of new half-open sessions that causes the firewall to start deleting
half-open sessions. The default is "100". When the rate of new connection attempts
rises above this number, the Prestige deletes half-open sessions as required to
accommodate new connection attempts. The Prestige stops deleting half-open
sessions when the number is less than the
One Minute Low.