ZyXEL Communications 652 Table 11-3Attack Alert

Prestige 652 ADSL Security Router

The following table describes the fields in this screen.

Table 11-3 Attack Alert

FIELD	DESCRIPTION	DEFAULT VALUES
Generate alert when	A detected attack automatically generates
attack detected	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.
Denial of Service Thresholds
One Minute Low	This is the rate of new half-open sessions	80 existing 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.
One Minute High	This is the rate of new half-open sessions	100 half-open sessions per
	that causes the firewall to start deleting	minute. The above numbers
	half-open sessions. When the rate of new	cause the Prestige to start
	connection attempts rises above this	deleting half-open sessions
	number, the Prestige deletes half-open	when more than 100 session
	sessions as required to accommodate	establishment attempts have
	new connection attempts.	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	This is the number of existing half-open	80 existing half-open sessions.
Low	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.
Maximum Incomplete	This is the number of existing half-open	100 half-open sessions per
High	sessions that causes the firewall to start	minute. The above values
	deleting half-open sessions. When the	causes the Prestige to start
	number of existing half-open sessions	deleting half-open sessions
	rises above this number, the Prestige	when the number of existing

Using the Prestige Web Configurator 11-9